CN115401964B - Magnesium-lithium alloy and aluminum alloy composite part, preparation method thereof, shell and electronic equipment - Google Patents
Magnesium-lithium alloy and aluminum alloy composite part, preparation method thereof, shell and electronic equipment Download PDFInfo
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- 239000001989 lithium alloy Substances 0.000 title claims abstract description 200
- 229910000733 Li alloy Inorganic materials 0.000 title claims abstract description 198
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 title claims abstract description 195
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 193
- 239000002131 composite material Substances 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 229910000765 intermetallic Inorganic materials 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 45
- 238000009792 diffusion process Methods 0.000 claims abstract description 43
- 229910018137 Al-Zn Inorganic materials 0.000 claims abstract description 20
- 229910018573 Al—Zn Inorganic materials 0.000 claims abstract description 20
- 239000011701 zinc Substances 0.000 claims description 81
- 238000001953 recrystallisation Methods 0.000 claims description 32
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical group [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 30
- 238000000137 annealing Methods 0.000 claims description 28
- 229910052725 zinc Inorganic materials 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 25
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 14
- 238000004321 preservation Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 3
- 229910019400 Mg—Li Inorganic materials 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 382
- 239000011257 shell material Substances 0.000 description 17
- 238000005096 rolling process Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000013329 compounding Methods 0.000 description 9
- 238000005098 hot rolling Methods 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 8
- 239000011777 magnesium Substances 0.000 description 7
- 239000007769 metal material Substances 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910003023 Mg-Al Inorganic materials 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000005496 eutectics Effects 0.000 description 4
- 238000005246 galvanizing Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- 238000005034 decoration Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/017—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of aluminium or an aluminium alloy, another layer being formed of an alloy based on a non ferrous metal other than aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
- B23K20/026—Thermo-compression bonding with diffusion of soldering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/14—Preventing or minimising gas access, or using protective gases or vacuum during welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/16—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
- B23K20/233—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer
- B23K20/2333—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer one layer being aluminium, magnesium or beryllium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/04—Metal casings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/15—Magnesium or alloys thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Laminated Bodies (AREA)
Abstract
The application discloses a magnesium-lithium alloy and aluminum alloy composite part, a preparation method thereof, a shell and electronic equipment; the magnesium-lithium alloy and aluminum alloy composite part comprises a magnesium-lithium alloy layer, an aluminum alloy layer and an auxiliary connecting layer, wherein the auxiliary connecting layer is positioned between the magnesium-lithium alloy layer and the aluminum alloy layer, and the auxiliary connecting layer is made of Zn; the Mg-Zn intermetallic compound layer is formed between the Mg-Li alloy layer and the auxiliary connecting layer through vacuum diffusion connection, the Al-Zn intermetallic compound layer is formed between the aluminum alloy layer and the auxiliary connecting layer through vacuum diffusion connection, and the Mg-Li alloy layer, the auxiliary connecting layer and the aluminum alloy layer are metallurgically bonded. The composite part adopts pure Zn as an auxiliary connecting layer between the magnesium-lithium alloy layer and the aluminum alloy layer, and has the advantages of higher bonding strength and good overall structural stability of each layer in the composite part, and the composite part has the advantages of two base materials, and has the characteristics of light weight, high strength, high rigidity and attractive and rich appearance.
Description
Technical Field
The application relates to the technical field of composite materials, in particular to a magnesium-lithium alloy and aluminum alloy composite part, a preparation method thereof, a shell and electronic equipment.
Background
The head-mounted display device is usually worn on the head of a user when in use, and the shell of the head-mounted display device has good appearance texture while meeting certain rigidity and strength, and more importantly, the material texture is light. Therefore, weight reduction is one of the long-sought goals of head-mounted display devices.
The magnesium-lithium alloy is used as a light structural material, has low density, high rigidity and excellent shock absorption performance, and is very suitable for being applied to appearance parts of head-mounted display equipment. However, the surface of the magnesium-lithium alloy can be decorated by a single means, and the texture of the traditional micro-arc oxidation and spraying process is low, so that the pursuit of users on high-end products is difficult to meet. Aluminum alloy is a common material for structural members of 3C electronic products, is often used as a housing of the products, and can obtain extremely high appearance effect through anodic oxidation treatment.
Because the magnesium-lithium alloy and the aluminum metal surface are easy to form an oxide film, the physical and chemical properties of the magnesium-lithium alloy and the aluminum metal surface are greatly different, and a high-quality composite part is difficult to obtain by the traditional combination method. If the traditional hot rolling is used for compounding, the metal base material to be compounded is often oxidized under the hot rolling condition, an oxide layer appears on the surface, which is a main reason for cracking after rolling, and for heterogeneous metal materials with larger differences of melting points and mechanical properties, the problem of uncooled deformation exists in the hot rolling process, even if the asynchronous rolling is adopted, an ideal joint surface is difficult to obtain, interface defects in the hot rolling compounding process are difficult to eliminate by the later diffusion annealing, and therefore, the magnesium-lithium alloy and aluminum metal are difficult to compound by the traditional hot rolling compounding technology.
Disclosure of Invention
The application aims to provide a magnesium-lithium alloy and aluminum alloy composite part, a preparation method thereof, a shell and a novel technical scheme of electronic equipment.
In a first aspect, an embodiment of the present application provides a magnesium-lithium alloy and aluminum alloy composite, where the magnesium-lithium alloy and aluminum alloy composite includes a magnesium-lithium alloy layer, an aluminum alloy layer, and an auxiliary connection layer, the auxiliary connection layer is located between the magnesium-lithium alloy layer and the aluminum alloy layer, and the auxiliary connection layer is made of Zn;
Mg-Zn intermetallic compound layers are formed between the magnesium-lithium alloy layers and the auxiliary connecting layers through vacuum diffusion connection, and Al-Zn intermetallic compound layers are formed between the aluminum alloy layers and the auxiliary connecting layers through vacuum diffusion connection, so that metallurgical bonding is achieved among the magnesium-lithium alloy layers, the auxiliary connecting layers and the aluminum alloy layers.
Optionally, the surface of the Mg-Zn intermetallic compound layer facing away from the auxiliary connection layer is a microscopically uneven surface, for forming tight connection with the magnesium-lithium alloy layer;
the surface of the Al-Zn intermetallic compound layer, which faces away from the auxiliary connection layer, is a micro uneven surface and is used for forming tight connection with the aluminum alloy layer.
Optionally, the material of the magnesium-lithium alloy layer includes at least one of LA91, LA141, LAZ933, LAZ931, LZ91, MA21 and MA18 magnesium-lithium alloy.
Optionally, the material of the aluminum alloy layer includes at least one of 1050, 1060, 5052, 6013, 6061, 6063 and 7a03 aluminum alloy.
Optionally, the auxiliary connection layer is a zinc layer, the zinc layer is formed on the surface of at least one of the magnesium-lithium alloy layer and the aluminum alloy layer by means of zinc dipping, electro-galvanizing or magnetron sputtering, and the thickness of the Zn layer is not more than 0.1 μm.
In a second aspect, an embodiment of the present application provides a method for preparing a composite of a magnesium-lithium alloy and an aluminum alloy, which is applied to preparing a composite of a magnesium-lithium alloy and an aluminum alloy as described above, the method comprising:
providing a magnesium-lithium alloy layer and an aluminum alloy layer;
carrying out grain refinement on the magnesium-lithium alloy layer and the aluminum alloy layer by adopting recrystallization annealing;
pretreating the magnesium-lithium alloy layer and the aluminum alloy layer to form a concave-convex surface with micron-sized roughness; and
Providing an auxiliary connecting layer, wherein the auxiliary connecting layer is made of Zn, and the thickness of the Zn layer is not more than 0.1 mu m; sequentially laminating the magnesium-lithium alloy layer, the auxiliary connecting layer and the aluminum alloy layer to form a preform, then carrying out vacuum diffusion connection on the preform, forming a Mg-Zn intermetallic compound layer between the magnesium-lithium alloy layer and the auxiliary connecting layer, and forming an Al-Zn intermetallic compound layer between the aluminum alloy layer and the auxiliary connecting layer through vacuum diffusion connection to obtain the magnesium-lithium alloy and aluminum alloy composite piece.
Optionally, the vacuum diffusion connection comprises: heating to a first set temperature by adopting a heating rate of 5-25 ℃/min under a vacuum environment, and then heating the connection pressure to the first set pressure by adopting a heating rate of 0.04-1 MPa/min; then preserving heat for a first set time; then the temperature is reduced to a second set temperature at a cooling speed of 10 ℃/min to 25 ℃/min; and finally cooling to room temperature.
Optionally, the first set temperature is 320-360 ℃, the first set pressure is 0.2-1 MPa, the first set time is 10-30 min, and the second set temperature is 80 ℃.
Optionally, the vacuum degree is kept between 1 Pa and 5×10 -3 Pa during the vacuum diffusion bonding.
Optionally, the recrystallization annealing includes: the recrystallization temperature range is 200-350 ℃, wherein the recrystallization annealing heat preservation time of the magnesium-lithium alloy layer is 15-60 min, and the recrystallization annealing heat preservation time of the aluminum alloy layer is 20-60 min.
Optionally, after the step of pretreating the magnesium-lithium alloy layer and the aluminum alloy layer, the method further comprises:
And (3) immersing the pretreated magnesium-lithium alloy layer and the aluminum alloy layer in a chromic anhydride acid solution with the volume percentage concentration of 30% for 3-5 min, sequentially washing with acetone, alcohol and deionized water, and finally drying the washed magnesium-lithium alloy layer and aluminum alloy layer.
In a third aspect, an embodiment of the present application provides a housing, where the housing is formed by processing the magnesium-lithium alloy and aluminum alloy composite part.
In a fourth aspect, an embodiment of the present application provides an electronic device, where the electronic device includes the housing described above.
The application has the beneficial effects that:
According to the magnesium-lithium alloy and aluminum alloy composite part, the pure Zn material is adopted as the auxiliary connecting layer between the magnesium-lithium alloy layer and the aluminum alloy layer, and the bonding strength of each layer in the obtained composite part is high and the overall structural stability is good through vacuum diffusion connection, so that the respective performance advantages of the two metal materials, namely the magnesium-lithium alloy and the aluminum alloy, can be fully exerted; the magnesium-lithium alloy can enable the obtained composite part to meet the light weight aim, and enable the composite part to have high rigidity and strength; the presence of the aluminum alloy can serve as a barrier layer to reduce the risk of corrosion of the magnesium-lithium alloy, and can obtain a rich appearance through anodic oxidation. These allow the resulting composite to be used in a wide variety of electronic device structures.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of a magnesium-lithium alloy and aluminum alloy composite according to an embodiment of the present application.
Reference numerals illustrate:
10. A magnesium-lithium alloy layer; 11. a first surface; 20. an aluminum alloy layer; 21. a second surface; 30. an auxiliary connection layer; 40. a Mg-Zn intermetallic compound layer; 50. an Al-Zn intermetallic compound layer; 60. and residual Zn layer.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
The magnesium-lithium alloy and aluminum alloy composite member, the preparation method thereof, the shell and the electronic equipment provided by the embodiment of the application are described in detail below with reference to the accompanying drawings.
The embodiment of the application provides a magnesium-lithium alloy and aluminum alloy composite part which can be applied to manufacturing a shell of electronic equipment. For example, the method can be used for manufacturing housings of head-mounted display devices such as AR and VR.
Of course, the magnesium-lithium alloy and aluminum alloy composite provided by the embodiment of the application comprises but is not limited to the manufacturing of a shell of electronic equipment, and can be used in other fields.
As shown in fig. 1, the magnesium-lithium alloy and aluminum alloy composite part of the embodiment of the application comprises a magnesium-lithium alloy layer 10, an aluminum alloy layer 20 and an auxiliary connecting layer 30, wherein the auxiliary connecting layer 30 is positioned between the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20, the auxiliary connecting layer 30 is made of Zn, and the thickness of the Zn layer is not more than 0.1 μm;
Mg-Zn intermetallic compound layer 40 is formed between magnesium-lithium alloy layer 10 and auxiliary connection layer 30 by vacuum diffusion connection, and Al-Zn intermetallic compound layer 50 is formed between aluminum alloy layer 20 and auxiliary connection layer 30 by vacuum diffusion connection, so that metallurgical bonding is performed among magnesium-lithium alloy layer 10, auxiliary connection layer 30 and aluminum alloy layer 20.
The embodiment of the application provides a magnesium-lithium alloy and aluminum alloy composite, which is a composite material, and can combine the dual performance advantages of a magnesium-lithium alloy material and an aluminum alloy material, and simultaneously solve the defect of a single material when the single material is applied to a shell of electronic equipment.
Specifically, the magnesium-lithium alloy and aluminum alloy composite member provided by the embodiment of the application can fully exert the respective performance advantages of two different metal materials, namely the magnesium-lithium alloy and the aluminum alloy. For example, the magnesium-lithium alloy layer 10 can be used as a main structural layer, so that the light weight target can be met, and the obtained composite part has high rigidity and strength; meanwhile, the aluminum alloy layer 20 can be used as an appearance decoration layer, and can be used as a barrier layer to reduce the risk of corrosion of the inner magnesium-lithium alloy layer 10 while obtaining rich appearance through anodic oxidation. Therefore, the magnesium-lithium alloy and aluminum alloy composite is a very potential electronic equipment shell material.
It should be noted that, since the oxide film is easily formed on the surfaces of the two metals, i.e., the magnesium-lithium alloy and the aluminum alloy, and the difference between the physical and chemical properties of the two metals is large, it is difficult to combine the two different metal materials by the conventional hot rolling combination method to obtain a high quality composite member. The reason is that the metal substrates to be compounded are often oxidized under the hot rolling condition, oxide layers appear on the surfaces of the metal substrates, which is a main reason for cracking after rolling, and the problem of inconsistent deformation exists in the hot rolling process for heterogeneous metal materials with large differences in melting point and mechanical properties, so that an ideal joint surface is difficult to obtain even if asynchronous rolling is adopted, and interface defects in the hot rolling compounding process are difficult to eliminate by later diffusion annealing.
According to the magnesium-lithium alloy and aluminum alloy composite part, the auxiliary connecting layer 30 made of pure Zn is introduced between the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 when the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 are compounded, and the auxiliary connecting layer 30 can assist in a solid-phase vacuum diffusion connection technology, so that a high-quality dissimilar metal composite part is obtained. Compared with the traditional rolling compounding method, the magnesium-lithium alloy and aluminum alloy composite piece obtained by the method has higher bonding strength and better stability, and meanwhile, the adverse problems of uncoordinated deformation of a base material, oxidation of the material, cracking of a bonding surface after rolling and the like in the rolling compounding process are effectively avoided.
In the scheme of the embodiment of the application, in order to prevent the direct interdiffusion of magnesium element and aluminum element in the two-phase base material from generating brittle Mg-Al intermetallic compound and improve the quality of a bonding surface, a pure Zn material is adopted as an auxiliary connecting layer 30 between the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 to connect the two, the thickness of the Zn intermediate layer is limited within 0.1 mu m, and no obvious load is caused to the weight of the composite material. The advantages are that: on the one hand, the pure zinc material as the intermediate auxiliary connecting layer 30 can effectively prevent the direct interdiffusion of different base material elements (magnesium element and aluminum element), thereby avoiding the generation of brittle intermediate phases. On the other hand, zinc atoms and magnesium atoms are mutually diffused to form a low-melting-point eutectic liquid phase region, and Mg-Zn solid solution is formed between the low-melting-point eutectic liquid phase region and aluminum atoms due to high solid solubility. This achieves a firm bond between the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20. The magnesium-lithium alloy and aluminum alloy composite part provided by the embodiment of the application is a high-quality composite material.
The Mg-Zn intermetallic compound layer 40 is a connection structure formed by chemical reaction by interdiffusion of Mg atoms in the Mg-li alloy layer 10 and Zn atoms in the auxiliary connection layer 30. The al—zn intermetallic compound layer 50 is a connection structure formed by interdiffusion of Al atoms in the aluminum alloy layer 20 and Zn atoms in the auxiliary connection layer 30 through chemical reaction. The auxiliary connection layer 30 prevents brittle Mg-Al intermetallic compounds formed after the chemical reaction of Mg atoms and Al atoms from being inter-diffused, and the presence of Mg-Al intermetallic compounds may affect the connection fastness of the aluminum alloy layer 20 and the magnesium-lithium alloy layer 10.
Specifically, in the magnesium-lithium alloy and aluminum alloy composite member according to the embodiment of the present application, as shown in fig. 1, the magnesium-lithium alloy layer 10 has at least one first surface 11, the aluminum alloy layer 20 has at least one second surface 21, and the first surface 11 and the second surface 21 may be laminated face to face when the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 are combined. An auxiliary connection layer 30 is located between the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20. In practice, the auxiliary connection layer 30 forms a residual Zn layer 60 having a certain thickness between the Mg-Zn intermetallic compound layer 40 and the Al-Zn intermetallic compound layer 50 after forming the Mg-Zn intermetallic compound layer 40 and the Al-Zn intermetallic compound layer 50 between the Mg-Zn intermetallic compound layer 40 and the Mg-Zn intermetallic compound layer 10 and the Al-Zn intermetallic compound layer 50, respectively.
According to the magnesium-lithium alloy and aluminum alloy composite part, the auxiliary connecting layer 30 is introduced and the connection between the magnesium-lithium alloy and the aluminum alloy dissimilar metal materials is realized through a vacuum diffusion connection technology, so that the obtained composite part has the dual performance advantages of the magnesium-lithium alloy and the aluminum alloy, and meanwhile, the inherent defect of a single material applied to an electronic equipment shell is overcome; the magnesium-lithium alloy and the aluminum alloy forming the composite part are tightly connected, and the bonding interface has high strength and stable structure, and can be widely applied to complex structural parts of electronic equipment.
The magnesium-lithium alloy and aluminum alloy composite part provided by the embodiment of the application is a new material integrating various advantages such as light weight, high rigidity, high heat dissipation, high quality appearance and the like, and is particularly suitable for being used as an appearance part of AR/VR equipment.
In some examples of the application, referring to fig. 1, the surface of the Mg-Zn intermetallic layer 40 facing away from the auxiliary connection layer 30 is a microscopically uneven surface for forming a tight connection with the magnesium-lithium alloy layer 10; the surface of the al—zn intermetallic layer 50 facing away from the auxiliary connection layer 30 is a microscopically uneven surface for forming a tight connection with the aluminum alloy layer 20.
As the reaction proceeds in the vacuum diffusion bonding, mg—zn intermetallic compound layers 40 and al—zn intermetallic compound layers 50 having a certain thickness are formed at the bonding interface, and gradually progress toward the respective corresponding matrix directions. Specifically, the Mg-Zn intermetallic layer 40 progresses toward the magnesium-lithium alloy layer 10, and the Al-Zn intermetallic layer 50 progresses toward the aluminum alloy layer 20, eventually forming a microscopically uneven surface for firmly bonding the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20.
Optionally, the material of the magnesium-lithium alloy layer 10 includes at least one of LA91, LA141, LAZ933, LAZ931, LZ91, MA21 and MA18 magnesium-lithium alloy.
In the magnesium-lithium alloy and aluminum alloy composite member according to the embodiment of the application, the magnesium-lithium alloy layer 10 can be used as an inner layer material of the composite member. By adopting the magnesium-lithium alloy materials, the obtained composite member has low density, high rigidity, high strength, high heat conduction and excellent damping performance, and the magnesium-lithium alloy and aluminum alloy composite member has good anti-drop performance. At the same time, these materials are also readily available without increasing production costs.
Optionally, the material of the aluminum alloy layer includes at least one of 1050, 1060, 5052, 6013, 6061, 6063 and 7a03 aluminum alloy.
The aluminum alloy materials are used as the outer layer material of the obtained composite member, can be used as a protective layer for preventing the inner magnesium lithium metal from oxidizing corrosion, and can also improve the decoration and wear resistance of the composite layer through the traditional anodic oxidation process.
In addition, in the embodiment of the present application, the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 may be obtained by a rolling process based on the materials used, and the forming manner is simple, so that the process difficulty may be reduced.
In some examples of the present application, the auxiliary connection layer 30 is a zinc layer formed on the surface of at least one of the magnesium lithium alloy layer 10 and the aluminum alloy layer 20 by zinc dipping, electro-galvanizing, or magnetron sputtering, the Zn layer being in a micrometer scale and having a thickness <0.1 μm.
In the embodiment of the present application, the auxiliary connection layer 30 made of pure Zn is introduced between the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20, so as to prevent direct interdiffusion of magnesium element and aluminum element in the two-phase substrate to generate brittle mg—al intermetallic compound, and improve the quality of the bonding layer. The auxiliary connecting layer 30 of zinc material can effectively prevent the mutual diffusion of the base material elements, thereby avoiding the generation of brittle intermediate phases; zinc atoms and magnesium atoms are mutually diffused to form a low-melting-point eutectic liquid phase region, and Mg-Zn solid solution is formed between the low-melting-point eutectic liquid phase region and aluminum atoms due to higher solid solubility.
To facilitate the introduction of the auxiliary connection layer 30 of pure Zn material between the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20, any of the above-described processes may be employed. The zinc layer may be directly formed on the surface of at least one of the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 by zinc dipping, electro-galvanizing or magnetron sputtering, so that the connection strength of the connection part is good, and the zinc layer may be stably present between the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20.
The composite part obtained by the application has higher bonding strength and better stability, and effectively solves the problems of uncoordinated deformation of the base material, oxidation of the material, cracking of the bonding layer after rolling and the like in the rolling and compounding process. Meanwhile, the magnesium-lithium alloy-aluminum alloy composite plate can obtain a high-performance electronic equipment shell after being subjected to stamping forming, and compared with the existing shell material, the shell manufactured by the composite piece has the advantages of light weight, high strength, high rigidity and abundant appearance effects.
The embodiment of the application also provides a preparation method of the magnesium-lithium alloy and aluminum alloy composite part, which can be applied to the preparation of the magnesium-lithium alloy and aluminum alloy composite part, and comprises the following steps of S1 to S4:
Step S1, providing a magnesium-lithium alloy layer and an aluminum alloy layer;
s2, carrying out grain refinement on the magnesium-lithium alloy layer and the aluminum alloy layer by adopting recrystallization annealing;
s3, preprocessing the magnesium-lithium alloy layer and the aluminum alloy layer to form a concave-convex surface with micron-sized roughness; and
Step S4, providing an auxiliary connecting layer, wherein the auxiliary connecting layer is made of Zn; sequentially laminating the magnesium-lithium alloy layer, the auxiliary connecting layer and the aluminum alloy layer to form a preform, then carrying out vacuum diffusion connection on the preform, forming a Mg-Zn intermetallic compound layer between the magnesium-lithium alloy layer and the auxiliary connecting layer, and forming an Al-Zn intermetallic compound layer between the aluminum alloy layer and the auxiliary connecting layer through vacuum diffusion connection to obtain the magnesium-lithium alloy and aluminum alloy composite piece.
The preparation method of the magnesium-lithium alloy and aluminum alloy composite part is simple, and is suitable for industrial production, and the obtained composite part is formed by forming an Mg-Zn intermetallic compound layer 40, a residual Zn layer 60 and an Al-Zn intermetallic compound layer 50 at the connecting interface of the aluminum alloy layer 20 and the magnesium-lithium alloy layer 10, and the three layers firmly form an integrated structure; meanwhile, the Mg-Zn intermetallic compound layer 40 is located at one side of the magnesium-lithium alloy layer 10 and can firmly connect the magnesium-lithium alloy layer 10, and the al-Zn intermetallic compound layer 50 is located at one side of the aluminum alloy layer 20 and can firmly connect the aluminum alloy layer 20, so that the aluminum alloy layer 20 and the magnesium-lithium alloy layer 10 can be firmly combined together to form a composite member laminated by dissimilar metal materials.
The Mg-Zn intermetallic compound layer 40 is a connection structure formed by chemical reaction by interdiffusion of Mg atoms in the Mg-li alloy layer 10 and Zn atoms in the auxiliary connection layer 30. The al—zn intermetallic compound layer 50 is a connection structure formed by interdiffusion of Al atoms in the aluminum alloy layer 20 and Zn atoms in the auxiliary connection layer 30 through chemical reaction. The auxiliary connection layer 30 prevents Mg atoms and Al atoms from being mutually diffused to form brittle Mg-Al intermetallic compounds after chemical reaction, and the presence of Mg-Al intermetallic compounds may affect the connection fastness of the aluminum alloy layer 20 and the magnesium-lithium alloy layer 10.
According to the preparation method of the magnesium-lithium alloy and aluminum alloy composite part, a high-quality bonding layer (comprising the Mg-Zn intermetallic compound layer 40, the residual Zn layer 60 and the Al-Zn intermetallic compound layer 50) is obtained by adopting an intermediate auxiliary solid phase diffusion connection technology. Compared with the existing rolling compounding method, the obtained composite piece has higher bonding strength and better stability, and the problems of uncoordinated deformation of a base material, oxidization of the material, cracking of a bonding layer after rolling and the like in the rolling compounding process are effectively avoided. The magnesium-lithium alloy and aluminum alloy composite part obtained by the preparation method can be subjected to stamping forming to obtain a formed part with a preset shape, and the requirement on the subsequent forming process is low.
As the reaction proceeds in the vacuum diffusion bonding, mg—zn intermetallic compound layers 40 and al—zn intermetallic compound layers 50 having a certain thickness are formed at the bonding interface, and gradually progress toward the respective corresponding matrix directions. Specifically, the Mg-Zn intermetallic layer 40 progresses toward the magnesium-lithium alloy layer 10, and the Al-Zn intermetallic layer 50 progresses toward the aluminum alloy layer 20, eventually forming a microscopically uneven surface for firmly bonding the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20.
In the preparation method provided by the embodiment of the present application, optionally, the material of the magnesium-lithium alloy layer 10 includes at least one of LA91, LA141, LAZ933, LAZ931, LZ91, MA21 and MA18 magnesium-lithium alloy.
Wherein the magnesium-lithium alloy layer 10 can be used as an inner layer material of a composite member. By adopting the magnesium-lithium alloy materials, the obtained composite member has low density, high rigidity, high strength, high heat conduction and excellent damping performance, and the magnesium-lithium alloy and aluminum alloy composite member has good anti-drop performance. At the same time, these materials are also readily available without increasing production costs.
In the preparation method provided by the embodiment of the application, optionally, the material of the aluminum alloy layer includes at least one of 1050, 1060, 5052, 6013, 6061, 6063 and 7a03 aluminum alloy.
The aluminum alloy materials are used as the outer layer material of the obtained composite member, can be used as a protective layer for preventing the inner magnesium lithium metal from oxidizing corrosion, and can also improve the decoration and wear resistance of the composite layer through the traditional anodic oxidation process.
In some examples of the present application, in the step S2, the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 are subjected to grain refinement by recrystallization annealing; the recrystallization annealing includes: the recrystallization temperature range is 200-350 ℃, wherein the recrystallization annealing heat preservation time of the magnesium-lithium alloy layer 10 is 15-60 min, and the recrystallization annealing heat preservation time of the aluminum alloy layer 20 is 20-60 min.
In the preparation method of the embodiment of the present application, before the Mg-li alloy layer 10 and the Al alloy layer 20 are connected by vacuum diffusion, the Mg-li alloy layer 10 and the Al alloy layer 20 need to be grain refined, that is, the structure grains are refined, so that the quality of the bonding layer (including the Mg-Zn intermetallic compound layer 40, the residual Zn layer 60 and the Al-Zn intermetallic compound layer 50) formed therebetween can be improved.
In the preparation method of the present application, the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 are subjected to grain refinement by adopting a recrystallization annealing method.
In the preparation method of the embodiment of the present application, before the mg-li alloy layer 10 and the al alloy layer 20 are subjected to vacuum diffusion connection, the first surface 11 of the mg-li alloy layer 10 and the second surface 21 of the al alloy layer 20 may be respectively subjected to grinding and polishing treatment (i.e., the pretreatment in the step S3 described above) to remove the oxide film on the surfaces and obtain uniform surface roughness, i.e., the first surface 11 and the second surface 21 respectively form concave-convex surfaces with micrometer roughness. After cleaning, the surfaces of the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 are bright and smooth, and almost no gaps exist.
The first surface 11 of the magnesium-lithium alloy layer 10 and the second surface 21 of the aluminum alloy layer 20 are surfaces to be connected to each other. Of course, other surfaces of the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 may be pretreated, and the present application is not limited thereto.
Optionally, after the step of pretreating the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20, the method further includes:
And (3) placing the pretreated magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 into a chromic anhydride acid solution with the volume percentage concentration of 30%, soaking for 3-5 min, then sequentially washing with acetone, alcohol and deionized water, and finally drying the washed magnesium-lithium alloy layer and aluminum alloy layer.
That is, after the surfaces of the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 are pretreated, the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 after the pretreatment need to be cleaned. Wherein, the chromic anhydride acid solution can dissolve the greasy dirt on the surface of the material, and the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 can remove the chromic anhydride acid solution and the greasy dirt after the acetone is washed and soaked by the chromic anhydride acid; finally, the surfaces of the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 can be further cleaned by alcohol and deionized water.
In some examples of the application, the vacuum is maintained at 1 to 5X 10-3Pa during the vacuum diffusion bonding. A good vacuum environment is formed.
In some examples of the application, the vacuum diffusion bonding comprises: heating to a first set temperature by adopting a heating rate of 5-25 ℃/min under a vacuum environment, and then heating the connection pressure to the first set pressure by adopting a heating rate of 0.04-1 MPa/min; then preserving heat for a first set time; then the temperature is reduced to a second set temperature at a cooling speed of 10 ℃/min to 25 ℃/min; and finally cooling to room temperature.
In some examples of the application, the first set temperature is 320 ℃ to 360 ℃, the first set pressure is 0.2MPa to 1MPa, the first set time is 10min to 30min, and the second set temperature is 80 ℃.
Specifically, in step S4 described above, the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 are subjected to vacuum diffusion bonding. For example, the assembled preform including the magnesium-lithium alloy layer 10, the auxiliary connection layer 30, and the aluminum alloy layer 20 is placed in a vacuum chamber. Wherein the auxiliary connection layer 30 is a zinc layer formed on the surface of at least one of the magnesium lithium alloy layer 10 and the aluminum alloy layer 20 by means of zinc dipping, electro-galvanizing or magnetron sputtering zinc.
And after the preform is installed, closing the furnace chamber and starting vacuumizing, and after the vacuum degree reaches 5 multiplied by 10 < -3 > Pa, starting a furnace body heating program to heat the preform, wherein the temperature of the preform can be measured by a thermocouple. Specifically, the diffusion connection temperature is set to 320-360 ℃, the applied load is 0.2-1 MPa, and the heat preservation time is 10-30 min. On the basis, the diffusion connection process is as follows: the connection temperature is firstly increased from room temperature to a specified temperature by adopting a heating rate of 5 ℃/min to 25 ℃/min, and then the connection pressure (load) is slowly increased to the specified pressure by adopting a boosting rate of 0.04MPa/min to 1 MPa/min. The program then proceeds to the soak zone. After the heat preservation is finished, the temperature of the obtained product is reduced to 80 ℃ at the cooling speed of 10-25 ℃ per minute under the original vacuum condition, then the connection pressure (load) is withdrawn at a constant speed, the product is naturally cooled to the room temperature along with a furnace, and the obtained magnesium-lithium alloy and aluminum alloy composite part is taken out.
And observing the microscopic morphology of the interface after connection under a microscope, wherein the interface connection is good, and no air holes, cracks or residual welding lines exist. The interface transition region of the bonding layer is composed of a Mg-Zn reaction diffusion layer near one side of the magnesium-lithium alloy layer 10, a Zn layer remained after insufficient reaction, and an Al-Zn solid solution layer near one side of the aluminum alloy 20 in sequence.
In the process of vacuum diffusion connection, the connection strength and quality of the formed connection interface of the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 are greatly influenced by controlling the temperature rising rate and the pressure rising rate. Generally, the slower the temperature rise rate and the pressure rise rate are, the high bonding strength and the good stability are achieved. However, the overall production efficiency is affected by too slow a temperature rise rate and a pressure rise rate, resulting in lower production efficiency.
More preferably, the temperature rise rate is 0.5 ℃/min and the pressure rise rate is 0.04MPa/min.
If either the temperature rise rate or the pressure rise rate is too fast, the zinc atoms in the auxiliary connection layer 30 and the magnesium atoms in the magnesium-lithium alloy layer 10, the zinc atoms in the auxiliary connection layer 30 and the aluminum atoms in the aluminum alloy layer 20 cannot be sufficiently diffused, and therefore, the bonding force between the magnesium-lithium alloy layer 10 and the aluminum alloy layer 20 is small and brittle, and various defects are caused.
And in the process of vacuum diffusion connection, a molding plate is adopted to apply connection pressure to the prefabricated body.
The method for producing the magnesium lithium alloy and aluminum alloy composite according to the present application is further described below by way of examples 1 to 3.
Example 1
The embodiment of the application provides a magnesium-lithium alloy and aluminum alloy composite part, which comprises the following steps:
Step S1, providing a magnesium-lithium alloy layer and an aluminum alloy layer;
wherein the magnesium-lithium alloy layer has at least one first surface, and the aluminum alloy layer has at least one second surface;
The material of the magnesium-lithium alloy layer comprises at least one of LA91, LA141, LAZ933, LAZ931, LZ91, MA21 and MA18 magnesium-lithium alloy; the aluminum alloy layer is made of at least one of 1050, 1060, 5052, 6013, 6061, 6063 and 7A03 aluminum alloy.
S2, carrying out grain refinement on the magnesium-lithium alloy layer and the aluminum alloy layer by adopting recrystallization annealing; the recrystallization annealing includes: the recrystallization temperature range is 200-350 ℃, wherein the recrystallization annealing heat preservation time of the magnesium-lithium alloy layer is 15min, and the recrystallization annealing heat preservation time of the aluminum alloy layer is 20min.
Step S3, grinding and polishing (i.e. pre-treatment) are performed on the first surface and the second surface to remove the oxide film on the surfaces and obtain uniform surface roughness, that is, to form concave-convex surfaces with micrometer roughness on the first surface 11 and the second surface 21 respectively.
After the step of pre-treating the first surface and the second surface, further comprising: and (3) immersing the pretreated magnesium-lithium alloy layer and the aluminum alloy layer in a chromic anhydride acid solution with the volume percentage concentration of 30% for 3min, sequentially cleaning with acetone, alcohol and deionized water, and finally drying the cleaned magnesium-lithium alloy layer and aluminum alloy layer.
Step S4, providing an auxiliary connecting layer, wherein the auxiliary connecting layer is made of Zn; sequentially laminating the magnesium-lithium alloy layer, the auxiliary connecting layer and the aluminum alloy layer to form a preform, then carrying out vacuum diffusion connection on the preform, forming a Mg-Zn intermetallic compound layer between the magnesium-lithium alloy layer and the auxiliary connecting layer, and forming an Al-Zn intermetallic compound layer between the aluminum alloy layer and the auxiliary connecting layer through vacuum diffusion connection to obtain the magnesium-lithium alloy and aluminum alloy composite piece.
The auxiliary connecting layer is a zinc layer, and the zinc layer is formed on the surface of at least one of the magnesium-lithium alloy layer and the aluminum alloy layer in a manner of magnetron sputtering zinc.
Wherein the vacuum diffusion bonding comprises: heating to 320 deg.C at a heating rate of 5 deg.C/min under vacuum condition with vacuum degree of 5×10 -3 Pa, heating to 0.2MPa at a heating rate of 0.04MPa/min, and maintaining for 10min; subsequently reducing the temperature to 80 ℃ at a cooling rate of 10 ℃/min; and finally cooling to room temperature.
Example 2
Step S1, providing a magnesium-lithium alloy layer and an aluminum alloy layer;
wherein the magnesium-lithium alloy layer has at least one first surface, and the aluminum alloy layer has at least one second surface;
The material of the magnesium-lithium alloy layer comprises at least one of LA91, LA141, LAZ933, LAZ931, LZ91, MA21 and MA18 magnesium-lithium alloy; the aluminum alloy layer is made of at least one of 1050, 1060, 5052, 6013, 6061, 6063 and 7A03 aluminum alloy.
S2, carrying out grain refinement on the magnesium-lithium alloy layer and the aluminum alloy layer by adopting recrystallization annealing; the recrystallization annealing includes: the recrystallization temperature range is 200-350 ℃, wherein the recrystallization annealing heat preservation time of the magnesium-lithium alloy layer is 40min, and the recrystallization annealing heat preservation time of the aluminum alloy layer is 45min.
Step S3, grinding and polishing (i.e. pre-treatment) are performed on the first surface and the second surface to remove the oxide film on the surfaces and obtain uniform surface roughness, that is, to form concave-convex surfaces with micrometer roughness on the first surface 11 and the second surface 21 respectively.
After the step of pre-treating the first surface and the second surface, further comprising: and (3) immersing the pretreated magnesium-lithium alloy layer and the aluminum alloy layer in a chromic anhydride acid solution with the volume percentage concentration of 30% for 4min, sequentially cleaning with acetone, alcohol and deionized water, and finally drying the cleaned magnesium-lithium alloy layer and aluminum alloy layer.
Step S4, providing an auxiliary connecting layer, wherein the auxiliary connecting layer is made of Zn; sequentially laminating the magnesium-lithium alloy layer, the auxiliary connecting layer and the aluminum alloy layer to form a preform, then carrying out vacuum diffusion connection on the preform, forming a Mg-Zn intermetallic compound layer between the magnesium-lithium alloy layer and the auxiliary connecting layer, and forming an Al-Zn intermetallic compound layer between the aluminum alloy layer and the auxiliary connecting layer through vacuum diffusion connection to obtain the magnesium-lithium alloy and aluminum alloy composite piece.
The auxiliary connecting layer is a zinc layer, and the zinc layer is formed on the surface of at least one of the magnesium-lithium alloy layer and the aluminum alloy layer in a manner of magnetron sputtering zinc.
Wherein the vacuum diffusion bonding comprises: heating to 340 ℃ at a heating rate of 10 ℃/min under a vacuum environment with a vacuum degree of 5 multiplied by 10 -3 Pa, then heating the connection pressure to 0.7MPa at a heating rate of 0.07MPa/min, and preserving heat for 20min; subsequently reducing the temperature to 80 ℃ at a cooling rate of 15 ℃/min; and finally cooling to room temperature.
Example 3
Step S1, providing a magnesium-lithium alloy layer and an aluminum alloy layer;
wherein the magnesium-lithium alloy layer has at least one first surface, and the aluminum alloy layer has at least one second surface;
The material of the magnesium-lithium alloy layer comprises at least one of LA91, LA141, LAZ933, LAZ931, LZ91, MA21 and MA18 magnesium-lithium alloy; the aluminum alloy layer is made of at least one of 1050, 1060, 5052, 6013, 6061, 6063 and 7A03 aluminum alloy.
S2, carrying out grain refinement on the magnesium-lithium alloy layer and the aluminum alloy layer by adopting recrystallization annealing; the recrystallization annealing includes: the recrystallization temperature range is 200-350 ℃, wherein the recrystallization annealing heat preservation time of the magnesium-lithium alloy layer is 60min, and the recrystallization annealing heat preservation time of the aluminum alloy layer is 60min.
Step S3, grinding and polishing (i.e. pre-treatment) are performed on the first surface and the second surface to remove the oxide film on the surfaces and obtain uniform surface roughness, that is, to form concave-convex surfaces with micrometer roughness on the first surface 11 and the second surface 21 respectively.
After the step of pre-treating the first surface and the second surface, further comprising: and (3) immersing the pretreated magnesium-lithium alloy layer and the aluminum alloy layer in a chromic anhydride acid solution with the volume percentage concentration of 30% for 5min, sequentially cleaning with acetone, alcohol and deionized water, and finally drying the cleaned magnesium-lithium alloy layer and aluminum alloy layer.
Step S4, providing an auxiliary connecting layer, wherein the auxiliary connecting layer is made of Zn; sequentially laminating the magnesium-lithium alloy layer, the auxiliary connecting layer and the aluminum alloy layer to form a preform, then carrying out vacuum diffusion connection on the preform, forming a Mg-Zn intermetallic compound layer between the magnesium-lithium alloy layer and the auxiliary connecting layer, and forming an Al-Zn intermetallic compound layer between the aluminum alloy layer and the auxiliary connecting layer through vacuum diffusion connection to obtain the magnesium-lithium alloy and aluminum alloy composite piece.
The auxiliary connecting layer is a zinc layer, and the zinc layer is formed on the surface of at least one of the magnesium-lithium alloy layer and the aluminum alloy layer in a manner of magnetron sputtering zinc.
Wherein the vacuum diffusion bonding comprises: heating to 360 ℃ at a heating rate of 25 ℃/min under a vacuum environment with a vacuum degree of 5 multiplied by 10 -3 Pa, then heating the connection pressure to 1MPa at a heating rate of 1MPa/min, and preserving heat for 30min; subsequently reducing the temperature to 80 ℃ at a cooling rate of 25 ℃/min; and finally cooling to room temperature.
The embodiment of the application also provides a shell, which is formed by processing the magnesium-lithium alloy and aluminum alloy composite part.
The formed shell has the advantages of light weight, high strength, high rigidity and rich appearance effect.
The embodiment of the application also provides electronic equipment, which comprises the shell. The shell is formed by processing the magnesium-lithium alloy and aluminum alloy composite part.
The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.
While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.
Claims (4)
1. A method for preparing a magnesium-lithium alloy and aluminum alloy composite part, which is characterized by comprising the following steps:
Providing a magnesium-lithium alloy layer and an aluminum alloy layer; the material of the magnesium-lithium alloy layer is at least one of LA91, LA141, LAZ933, LAZ931, LZ91, MA21 and MA18 magnesium-lithium alloy, and the material of the aluminum alloy layer is at least one of 1050, 1060, 5052, 6013, 6061, 6063 and 7A03 aluminum alloy;
carrying out grain refinement on the magnesium-lithium alloy layer and the aluminum alloy layer by adopting recrystallization annealing;
pretreating the magnesium-lithium alloy layer and the aluminum alloy layer to form a concave-convex surface with micron-sized roughness; and
Providing an auxiliary connecting layer, wherein the auxiliary connecting layer is made of Zn; sequentially laminating the magnesium-lithium alloy layer, the auxiliary connecting layer and the aluminum alloy layer to form a preform, then carrying out vacuum diffusion connection on the preform, forming an Mg-Zn intermetallic compound layer between the magnesium-lithium alloy layer and the auxiliary connecting layer, and forming an Al-Zn intermetallic compound layer between the aluminum alloy layer and the auxiliary connecting layer to obtain a magnesium-lithium alloy and aluminum alloy composite piece;
The auxiliary connecting layer is a zinc layer, the zinc layer is formed on the surface of at least one of the magnesium-lithium alloy layer and the aluminum alloy layer in a zinc dipping, electrogalvanizing or magnetron sputtering way, and the thickness of the zinc layer is less than 0.1 mu m;
Wherein, the vacuum diffusion connection is: heating to a first set temperature by adopting a heating speed of 5-25 ℃ per minute under a vacuum environment, and then heating the connection pressure to the first set pressure by adopting a heating speed of 0.04-1 MPa per minute; then preserving heat for a first set time; then reducing the temperature to a second set temperature at a cooling rate of 10-25 ℃ per minute; finally cooling to room temperature;
The first set temperature is 320-360 ℃, the first set pressure is 0.2-1 MPa, the first set time is 10-30 min, and the second set temperature is 80 ℃;
In the vacuum diffusion connection process, keeping the vacuum degree at 1-5 multiplied by 10 -3 Pa;
the recrystallization annealing includes: the recrystallization temperature ranges from 200 ℃ to 350 ℃, wherein the recrystallization annealing heat preservation time of the magnesium-lithium alloy layer ranges from 15min to 60min, and the recrystallization annealing heat preservation time of the aluminum alloy layer ranges from 20min to 60min.
2. The method according to claim 1, further comprising, after the step of pretreating the magnesium-lithium alloy layer and the aluminum alloy layer:
And (3) placing the pretreated magnesium-lithium alloy layer and the aluminum alloy layer in a chromic anhydride acid solution with the volume percentage concentration of 30% to soak for 3 min-5 min, then sequentially washing with acetone, alcohol and deionized water, and finally drying the washed magnesium-lithium alloy layer and aluminum alloy layer.
3. A housing, characterized in that a magnesium-lithium alloy and aluminum alloy composite is used, and the magnesium-lithium alloy and aluminum alloy composite is produced by the production method according to claim 1 or 2.
4. An electronic device comprising the housing of claim 3.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105149769A (en) * | 2015-07-29 | 2015-12-16 | 武汉理工大学 | Method for introducing design of laminated compound interlayers to enable magnesium alloy and aluminium alloy to be connected |
| CN105436701A (en) * | 2015-12-15 | 2016-03-30 | 西南交通大学 | Connecting method of magnesium-based metal and aluminum-based metal |
| CN114131170A (en) * | 2021-12-24 | 2022-03-04 | 西南交通大学 | Low-temperature diffusion welding method for magnesium/aluminum dissimilar metal |
| CN114210953A (en) * | 2021-12-17 | 2022-03-22 | 歌尔光学科技有限公司 | Magnesium-lithium-aluminum composite material part and preparation method and application thereof |
| CN216885582U (en) * | 2021-11-05 | 2022-07-05 | 歌尔光学科技有限公司 | Composite material structure and electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6542649B2 (en) * | 2015-11-20 | 2019-07-10 | 株式会社神戸製鋼所 | Aluminum alloy clad plate and aluminum alloy clad structural member |
-
2022
- 2022-08-31 CN CN202211053828.4A patent/CN115401964B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105149769A (en) * | 2015-07-29 | 2015-12-16 | 武汉理工大学 | Method for introducing design of laminated compound interlayers to enable magnesium alloy and aluminium alloy to be connected |
| CN105436701A (en) * | 2015-12-15 | 2016-03-30 | 西南交通大学 | Connecting method of magnesium-based metal and aluminum-based metal |
| CN216885582U (en) * | 2021-11-05 | 2022-07-05 | 歌尔光学科技有限公司 | Composite material structure and electronic equipment |
| CN114210953A (en) * | 2021-12-17 | 2022-03-22 | 歌尔光学科技有限公司 | Magnesium-lithium-aluminum composite material part and preparation method and application thereof |
| CN114131170A (en) * | 2021-12-24 | 2022-03-04 | 西南交通大学 | Low-temperature diffusion welding method for magnesium/aluminum dissimilar metal |
Non-Patent Citations (2)
| Title |
|---|
| "镁合金与铝合金的夹层扩散焊连接";赵丽敏等;《焊接学报》;第28卷(第10期);第0-3节 * |
| 冶金报社科技部.《 冶金科普读物 冶金科学导游1》.冶金工业出版社,1985,第315-316页. * |
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