CN102248278A - Magnesium alloy and aluminum alloy interlayer diffusion welding method - Google Patents
Magnesium alloy and aluminum alloy interlayer diffusion welding method Download PDFInfo
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- CN102248278A CN102248278A CN2011101720059A CN201110172005A CN102248278A CN 102248278 A CN102248278 A CN 102248278A CN 2011101720059 A CN2011101720059 A CN 2011101720059A CN 201110172005 A CN201110172005 A CN 201110172005A CN 102248278 A CN102248278 A CN 102248278A
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Abstract
The invention relates to a magnesium alloy and aluminum alloy interlayer diffusion welding method. The method mainly comprises the following steps of: (1) machining a welding metal base, namely processing, abrading, polishing and ultrasonically washing magnesium alloy and aluminum alloy; (2) depositing Cu films on the magnesium alloy and the aluminum alloy by controlling process parameters by using magnetron sputtering coating equipment; and (3) assembling the coated metal base by using a die, placing the die into a vacuum hot-pressing furnace, and controlling welding temperature, heat-preserving time and pressure to obtain a welding joint. The method has the advantages that: (1) the Cu film can protect the surface of the welding metal base better and reduce generation of inert metal oxide layers; (2) the Cu element improves phase constitution and the microstructure of a welding interface and inhibits generation of brittle intermetallic compounds in the midlayer of the welding joint; and (3) the welding joint has high strength, the tensile strength can reach 10 to 20 MPa, small deformation occurs in the welding joint, and the residual stress is small.
Description
Technical field
The present invention relates to magnesium alloy and aluminium alloy welding field, the method for particularly a kind of magnesium alloy and aluminium alloy interlayer Diffusion Welding.
Background technology
Aluminium is the highest metallic element of content in the earth's crust, and aluminium alloy is to use one of the widest structural metallic materials at present.Aluminium alloy density is low, but strength ratio is higher, near or surpass the high-quality steel, its plasticity is good simultaneously, can be processed into various section bars, has characteristics such as good electrical conductivity, thermal conductivity and corrosion stability.Aluminium alloy has a wide range of applications in fields such as automobile, Aero-Space, building decorations.
In the last few years, magnesium alloy has more and more caused the extensive concern of various circles of society as a kind of novel structural timber, because of advantages such as it has the specific strength height, rigidity is big, shock resistance good, shock resistance is good, thermal capacity is low, condensation rate is fast, favorable mechanical processing characteristicies, fields such as automobile making, Aero-Space, consumer electronic product now have been widely used in.
If realize the welding of magnesium alloy and aluminium alloy dissimilar metal and form reliable welding structural element, can not only give full play to magnesium alloy, aluminium alloy excellent properties separately, can also expand it greatly in high-tech area, the particularly application aspect Aero-Space has very great realistic significance so realize the welding of magnalium special metal.Yet magnalium special metal will realize that because of the general welding method of the difference utilization of its physicochemical properties its reliable connection is very difficult, two kinds of metals directly weld the main problem that exists and are: the activity of (1) magnesium, aluminium is very high, react at surface formation one deck oxidation film with airborne oxygen easily, the existence of oxidation film is unfavorable for the phase counterdiffusion of mother metal atom, causes welding procedure to be difficult to control; (2) magnesium and aluminium easily react to each other, and the welding point interface zone generates between a large amount of high rigidity brittle metals compound and lamination occurs, causes strength of welded joint not high.
Summary of the invention
Technical problem to be solved by this invention is: provide the method for a kind of magnesium alloy and aluminium alloy interlayer Diffusion Welding, to overcome the problem that exists in existing magnesium alloy and the direct Diffusion Welding of aluminium alloy.
The present invention solves its technical problem and adopts following technical scheme:
The method of magnesium alloy provided by the invention and aluminium alloy interlayer Diffusion Welding specifically is to adopt the method that may further comprise the steps:
(1) welding base metal machining processes:
Utilize the method for line cutting to carry out preliminary working the welding base metal of buying, the weldment for the treatment of after utilizing the ultraprecise surface grinding machine to cutting is then polished, and with the sand papering surface to be welded to remove surface oxide layer and utilize the high precision polishing machine that surface to be welded is polished, to guarantee that its surface roughness Ra is better than 0.1 μ m, utilize organic solvent the weldment for the treatment of after polishing to be carried out ultrasonic cleaning at last, obtain the weldment for the treatment of of cleaning surfaces as cleaning agent;
(2) surface coating of welding base metal is handled:
The weldment for the treatment of of cleaning surfaces is put into the sample room that vacuumizes in advance, utilize magnetron sputtering technique treating that weldment magnesium and aluminium surface respectively deposit one deck Cu film then, treat after sputter finishes that substrate cool off the weldment for the treatment of after the back taking-up coating film treatment naturally;
(3) treat weldment Diffusion Welding step:
The weldment for the treatment of after the coating film treatment is stacked in the WC sintered-carbide die of packing into, and spraying boron nitride ceramics in the pressure head up and down of mould surface is as solder resist; Subsequently mould is placed between the last push-down head in the vacuum hotpressing stove, closes fire door; Furnace chamber is vacuumized; Vacuum reaches 10 in stove
-3Pa ~ 10
-4Utilize predefined temperature program(me) to heat behind the Pa, be incubated 30min ~ 2h after temperature reaches 420 ℃ ~ 470 ℃ in the stove, implement vacuum diffusion welding and connect; Treat weldment and apply axial compressive force 3MP ~ 10MPa before holding stage, holding stage is laid down pressure after finishing; Powered-down, weldment is taken out in stove cooling back;
Through above-mentioned steps, realize the interlayer Diffusion Welding of magnesium alloy mother metal and aluminium alloy mother metal.
Described organic solvent can be absolute ethyl alcohol or acetone.
It is that 99.99% copper target is as target that described magnetron sputtering technique can adopt purity.
In deposition Cu thin-film process, the vacuum of sample room can be 1.0 * 10
-3Pa ~ 1.0 * 10
-4Pa.
In deposition Cu thin-film process, its technology can for: underlayer temperature is 80 ℃ ~ 200 ℃, and heating rate is 5 ℃ ~ 15 ℃, and sputtering power is 80W ~ 150W, and ar pressure is 0.5Pa ~ 1.5Pa, and sedimentation time is 30min ~ 1.5h.
In the vacuum diffusion welding termination process, programming rate adopts the multistep cascade raising temperature, specifically is that first heating rate by 5 ℃～10 ℃/min is warming up to 320 ℃～370 ℃, and the heating rate with 2 ℃～10 ℃/min rises to 420 ℃～470 ℃ then.
Described magnesium alloy mother metal can be pure magnesium, AZ31B or MB2 magnesium alloy.
Described aluminium alloy mother metal can be fine aluminium, LY12 or 6061 aluminium alloys.
The present invention compared with prior art has following main advantage:
1. utilize vacuum diffusion welding method, not only realized the welding of magnalium special metal under low welding temperature, welding point connects closely, and the welding point hot strength can reach 10MPa ~ 20MPa, and the whole depth of parallelism of weldment is good, precision is high.
2. utilize magnetron sputtering technology at welding base metal magnesium alloy and aluminum alloy surface deposition Cu film, can prepare intensity height, depth of parallelism height, distortion is little and residual stress is little magnesium/aluminium welding point,
3. technology is simple, is beneficial to popularization, is particularly suitable for magnesium alloy and aluminium alloy low temp interlayer Diffusion Welding.
Description of drawings
Fig. 1 is a process chart of the present invention.
Fig. 2 is a mould assembling schematic diagram of the present invention.
Fig. 3 is a mold mechanism profile of the present invention.
Fig. 4 is that to add thickness be 440 ℃ of welding temperatures behind the 0.3 μ mCu intermediate layer in the present invention, temperature retention time 60min, the scanning electron microprobe of the weld interface of Diffusion Welding magnesium alloy and aluminium alloy (EPMA) microstructure and Cu element line can spectrograms under the welding pressure 5MPa.
Fig. 5 is that to add thickness be 470 ℃ of welding temperatures behind the 0.5 μ mCu intermediate layer in the present invention, temperature retention time 60min, the scanning electron microprobe of the weld interface of Diffusion Welding magnesium alloy and aluminium alloy (EPMA) microstructure and Cu element line can spectrograms under the welding pressure 5MPa.
Among the figure: 1. seaming chuck; 2. WC carbide alloy seaming chuck; 3. overlap in the WC carbide alloy; 4. WC carbide alloy overcoat; 5. boron nitride ceramics solder mask; 6. aluminium alloy is treated weldment; 7. Cu thin layer; 8. magnesium alloy is treated weldment; 9. WC carbide alloy push-down head; 10. push-down head; 11. reaction intermediate layer; 12. aluminium base side; 13. magnesium matrix side.
The specific embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but be not limited to following described content.
Embodiment 1:
Magnesium alloy is treated that weldment 8 and aluminium alloy treat that weldment 6 carries out Diffusion Welding and is connected, and wherein: magnesium alloy treats that weldment 8 is diameter of phi 23 * 2mm MB2 magnesium alloy, and aluminium alloy treats that weldment 6 is diameter of phi 23 * 2mm LY12 aluminium alloy.Magnetron sputtering C u thin layer 7 thickness 0.5 μ m, the diffusion connecting process condition is: 470 ℃ of welding temperatures, temperature retention time 30min, welding pressure 3MPa.
Referring to Fig. 1, it is as follows that magnesium alloy is treated that weldment 8 and aluminium alloy treat that weldment 6 carries out the concrete steps of Diffusion Welding:
1. treat the weldment machining processes:
With the ultraprecise surface grinding machine magnesium alloy and aluminium alloy are processed into circle sheet, weldering is preceding with 1000
#, 1200
#SiC sand paper and 05,06, No. 07 abrasive paper for metallograph are polished to be welded of circle sheet, and with the polishing of high precision polishing machine, are better than 0.1 μ m to guarantee its surface roughness Ra, back acetone soln ultrasonic cleaning 10min.
2. treat the processing of weldment surface coating:
With treating that weldment is delivered in advance and vacuumize (1.0 * 10 after the above-mentioned processing
-3Pa ~ 1.0 * 10
-4Pa) in the sample room, adopt the magnetron sputtering membrane process treating that weldment surface deposition one layer thickness is Cu thin layer 7(Fig. 2 of 0.5 μ m), the substrate after sputter finishes cools off back taking-up plated film naturally and treats weldment.
Described magnetron sputtering membrane process is a prior art, and its technological parameter comprises underlayer temperature, substrate heating rate, sputtering power, partial pressure of ar gas, sputtering time.Wherein: underlayer temperature is 80 ℃ ~ 200 ℃; The substrate heating rate is 5 ℃ ~ 15 ℃; Sputtering power is 80W ~ 150W; Partial pressure of ar gas is 0.5Pa ~ 1.5Pa; Sputtering time is 30min ~ 90min.
3. treat the weldment Diffusion Welding:
To treat that weldment stacks in the WC sintered-carbide die of packing into (abbreviation mould); WC carbide alloy seaming chuck 2, WC carbide alloy push-down head 9 to mould spray boron nitride ceramics as solder resist, form boron nitride ceramics solder mask 5; Subsequently mould is placed between seaming chuck 1 in the vacuum hotpressing stove, the push-down head 10, closes fire door; Utilize mechanical pump and molecular pump that the vacuum hotpressing furnace cavity is vacuumized, vacuum is better than 9.0 * 10 in this stove
-3Utilize predefined temperature program(me) to heat behind the Pa, welded piece is heated up; Heating rate by 10 ℃/min is warming up to 370 ℃, rises to 420 ℃ with 5 ℃/min then, rises to 470 ℃ with 2 ℃/min again, and insulation 30min applies the 3MPa axial compressive force when temperature rises to 350 ℃, and holding stage is laid down pressure after finishing fully; Treat this stove cooling back taking-up weldment.Testing result shows that the weldment joint tensile strength reaches 15MPa, the depth of parallelism is 0.012mm.
Embodiment 2:
Magnesium alloy is treated that weldment 8 and aluminium alloy treat that weldment 6 carries out Diffusion Welding and is connected, and wherein: magnesium alloy treats that weldment 8 is diameter of phi 23 * 2mm MB2 magnesium alloy, and aluminium alloy treats that weldment 6 is diameter of phi 23 * 2mm LY12 aluminium alloy.Magnetron sputtering C u thin layer 7 thickness 0.1 μ m, the diffusion connecting process condition is: 420 ℃ of welding temperatures, temperature retention time 120min, welding pressure 10MPa.
Referring to Fig. 1, it is as follows that magnesium alloy is treated that weldment 8 and aluminium alloy treat that weldment 6 carries out the concrete steps of Diffusion Welding:
1. treat the weldment machining processes:
With the ultraprecise surface grinding machine magnesium alloy and aluminium alloy are processed into circle sheet, weldering is preceding with 1000
#, 1200
#SiC sand paper and 05,06, No. 07 abrasive paper for metallograph are polished to be welded of circle sheet, and with the polishing of high precision polishing machine, are better than 0.1 μ m to guarantee its surface roughness Ra, back acetone soln ultrasonic cleaning 10min.
2. treat the processing of weldment surface coating:
With treating that weldment is delivered in advance and vacuumize (1.0 * 10 after the above-mentioned processing
-3Pa ~ 1.0 * 10
-4Pa) in the sample room, adopt the magnetron sputtering membrane process treating that weldment surface deposition one layer thickness is Cu thin layer 7(Fig. 2 of 0.1 μ m), the substrate after sputter finishes cools off back taking-up plated film naturally and treats weldment.
Described magnetron sputtering membrane process is a prior art, and its technological parameter comprises underlayer temperature, substrate heating rate, sputtering power, partial pressure of ar gas, sputtering time.Wherein: underlayer temperature is 80 ℃ ~ 200 ℃; The substrate heating rate is 5 ℃ ~ 15 ℃; Sputtering power is 80W ~ 150W; Partial pressure of ar gas is 0.5Pa ~ 1.5Pa; Sputtering time is 30min ~ 90min.
3. treat the weldment Diffusion Welding:
To treat that weldment stacks in the WC sintered-carbide die of packing into (abbreviation mould); WC carbide alloy seaming chuck 2, WC carbide alloy push-down head 9 to mould spray boron nitride ceramics as solder resist, form boron nitride ceramics solder mask 5; Subsequently mould is placed between seaming chuck 1 in the vacuum hotpressing stove, the push-down head 10, closes fire door; Utilize mechanical pump and molecular pump that the vacuum hotpressing furnace cavity is vacuumized, vacuum is better than 9.0 * 10 in this stove
-3Utilize predefined temperature program(me) to heat behind the Pa, welded piece is heated up; Heating rate by 10 ℃/min is warming up to 320 ℃, rises to 370 ℃ with 5 ℃/min then, rises to 420 ℃ with 2 ℃/min again, and insulation 120min applies the 3MPa axial compressive force when temperature rises to 370 ℃, and holding stage is laid down pressure after finishing fully; Treat this stove cooling back taking-up weldment.Testing result shows that the weldment joint tensile strength reaches 10.5MPa, the depth of parallelism is 0.008mm.
Embodiment 3:
Magnesium alloy is treated that weldment 8 and aluminium alloy treat that weldment 6 carries out Diffusion Welding and is connected, and wherein: magnesium alloy treats that weldment 8 is diameter of phi 23 * 2mm MB2 magnesium alloy, and aluminium alloy treats that weldment 6 is diameter of phi 23 * 2mm LY12 aluminum alloy sheet.Magnetron sputtering C u thin layer 7 thickness 0.3 μ m, the diffusion connecting process condition is: 440 ℃ of welding temperatures, temperature retention time 60min, welding pressure 5MPa.
Referring to Fig. 1, it is as follows that magnesium alloy is treated that weldment 8 and aluminium alloy treat that weldment 6 carries out the concrete steps of Diffusion Welding:
1. treat the weldment machining processes:
With the ultraprecise surface grinding machine magnesium alloy and aluminium alloy are processed into circle sheet, weldering is preceding with 1000
#, 1200
#SiC sand paper and 05,06, No. 07 abrasive paper for metallograph are polished to be welded of circle sheet, and with the polishing of high precision polishing machine, are better than 0.1 μ m to guarantee its surface roughness Ra, back acetone soln ultrasonic cleaning 10min.
2. treat the processing of weldment surface coating:
With treating that weldment is delivered in advance and vacuumize (1.0 * 10 after the above-mentioned processing
-3Pa ~ 1.0 * 10
-4Pa) in the sample room, adopt the magnetron sputtering membrane process treating that weldment surface deposition one layer thickness is Cu thin layer 7(Fig. 2 of 0.3 μ m), the substrate after sputter finishes cools off back taking-up plated film naturally and treats weldment.
Described magnetron sputtering membrane process is a prior art, and its technological parameter comprises underlayer temperature, substrate heating rate, sputtering power, partial pressure of ar gas, sputtering time.Wherein: underlayer temperature is 80 ℃ ~ 200 ℃; The substrate heating rate is 5 ℃ ~ 15 ℃; Sputtering power is 80W ~ 150W; Partial pressure of ar gas is 0.5Pa ~ 1.5Pa; Sputtering time is 30min ~ 90min.
3. treat the weldment Diffusion Welding:
To treat that weldment stacks in the WC sintered-carbide die of packing into (abbreviation mould); WC carbide alloy seaming chuck 2, WC carbide alloy push-down head 9 to mould spray boron nitride ceramics as solder resist, form boron nitride ceramics solder mask 5; Subsequently mould is placed between seaming chuck 1 in the vacuum hotpressing stove, the push-down head 10, closes fire door; Utilize mechanical pump and molecular pump that the vacuum hotpressing furnace cavity is vacuumized, vacuum is better than 9.0 * 10 in this stove
-3Utilize predefined temperature program(me) to heat behind the Pa, welded piece is heated up; Heating rate by 10 ℃/min is warming up to 340 ℃, rises to 390 ℃ with 5 ℃/min then, rises to 440 ℃ with 2 ℃/min again, and insulation 60min applies the 5MPa axial compressive force when temperature rises to 390 ℃, and holding stage is laid down pressure after finishing fully; Treat this stove cooling back taking-up weldment.Testing result shows that the weldment joint tensile strength reaches 17.2MPa, the depth of parallelism is 0.006mm.As can be seen from Figure 4, the magnalium weld interface is in conjunction with good, and Cu thin layer 7 thickness are comparatively even, do not have defectives such as tangible crackle, hole.
Embodiment 4:
Magnesium alloy is treated that weldment 8 and aluminium alloy treat that weldment 6 carries out Diffusion Welding and is connected, and wherein: magnesium alloy treats that weldment 8 is diameter of phi 23 * 2mm MB2 magnesium alloy, and aluminium alloy treats that weldment 6 is diameter of phi 23 * 2mm LY12 aluminium alloy.Magnetron sputtering C u thin layer 7 thickness 0.4 μ m, the diffusion connecting process condition is: 420 ℃ of welding temperatures, temperature retention time 60min, welding pressure 5MPa.
Referring to Fig. 1, it is as follows that magnesium alloy is treated that weldment 8 and aluminium alloy treat that weldment 6 carries out the concrete steps of Diffusion Welding:
1. treat the weldment machining processes:
With the ultraprecise surface grinding machine magnesium alloy and aluminium alloy are processed into circle sheet, weldering is preceding with 1000
#, 1200
#SiC sand paper and 05,06, No. 07 abrasive paper for metallograph are polished to be welded of circle sheet, and with the polishing of high precision polishing machine, are better than 0.1 μ m to guarantee its surface roughness Ra, back acetone soln ultrasonic cleaning 10min.
2. treat the processing of weldment surface coating:
With treating that weldment is delivered in advance and vacuumize (1.0 * 10 after the above-mentioned processing
-3Pa ~ 1.0 * 10
-4Pa) in the sample room, adopt the magnetron sputtering membrane process treating that weldment surface deposition one layer thickness is Cu thin layer 7(Fig. 2 of 0.4 μ m), the substrate after sputter finishes cools off back taking-up plated film naturally and treats weldment.
Described magnetron sputtering membrane process is a prior art, and its technological parameter comprises underlayer temperature, substrate heating rate, sputtering power, partial pressure of ar gas, sputtering time.Wherein: underlayer temperature is 80 ℃ ~ 200 ℃; The substrate heating rate is 5 ℃ ~ 15 ℃; Sputtering power is 80W ~ 150W; Partial pressure of ar gas is 0.5Pa ~ 1.5Pa; Sputtering time is 30min ~ 90min.
3. treat the weldment Diffusion Welding:
To treat that weldment stacks in the WC sintered-carbide die of packing into (abbreviation mould); WC carbide alloy seaming chuck 2, WC carbide alloy push-down head 9 to mould spray boron nitride ceramics as solder resist, form boron nitride ceramics solder mask 5; Subsequently mould is placed between seaming chuck 1 in the vacuum hotpressing stove, the push-down head 10, closes fire door; Utilize mechanical pump and molecular pump that the vacuum hotpressing furnace cavity is vacuumized, vacuum is better than 9.0 * 10 in this stove
-3Utilize predefined temperature program(me) to heat behind the Pa, welded piece is heated up; Heating rate by 10 ℃/min is warming up to 320 ℃, rises to 370 ℃ with 5 ℃/min then, rises to 420 ℃ with 2 ℃/min again, and insulation 30min applies the 3MPa axial compressive force when temperature rises to 370 ℃, and holding stage is laid down pressure after finishing fully; Treat this stove cooling back taking-up weldment.Testing result shows that the weldment joint tensile strength reaches 20MPa, the depth of parallelism is 0.008mm.
The WC sintered-carbide die that the foregoing description adopts, its structure as shown in Figures 2 and 3, this mould by overlap 3 in WC carbide alloy seaming chuck 2, WC carbide alloy push-down head 9, the WC carbide alloy, WC carbide alloy overcoat 4 forms, wherein: treat that weldment places between WC carbide alloy seaming chuck 2, the WC carbide alloy push-down head 9.The periphery of described seaming chuck and push-down head 3 is entangled by cover in the WC carbide alloy respectively, and the cover periphery is entangled by a WC carbide alloy overcoat 4 respectively again in two, and guaranteeing the treating weldment alignment, and contact closely.As can be seen from Figure 3, the magnalium weld interface is in conjunction with good, and intermediate layer thickness is comparatively even, does not have defectives such as tangible crackle, hole.Numbering 11,12 and 13 is respectively reaction intermediate layer, aluminium base side and a magnesium matrix side.
In the foregoing description, it is PFG500DXAL ultraprecise surface grinding machine (this work mechanism of Japanese ridge is made society) that the ultraprecise surface grinding machine can adopt model.
In the foregoing description, the high precision polishing machine can adopt model be MA-200 high precision polishing machine (Japanese New Metals and Chemicals Corporation, Ltd).
Claims (8)
1. the method for magnesium alloy and aluminium alloy interlayer Diffusion Welding is characterized in that adopting the method that may further comprise the steps:
(1) welding base metal machining processes:
Utilize the method for line cutting to carry out preliminary working the welding base metal of buying, the weldment for the treatment of after utilizing the ultraprecise surface grinding machine to cutting is then polished, and with the sand papering surface to be welded to remove surface oxide layer and utilize the high precision polishing machine that surface to be welded is polished, to guarantee that its surface roughness Ra is better than 0.1 μ m, utilize organic solvent the weldment for the treatment of after polishing to be carried out ultrasonic cleaning at last, obtain the weldment for the treatment of of cleaning surfaces as cleaning agent;
(2) surface coating of welding base metal is handled:
The weldment for the treatment of of cleaning surfaces is put into the sample room that vacuumizes in advance, utilize magnetron sputtering technique treating that weldment magnesium and aluminium surface respectively deposit one deck Cu film then, treat after sputter finishes that substrate cool off the weldment for the treatment of after the back taking-up coating film treatment naturally;
(3) treat weldment Diffusion Welding step:
The weldment for the treatment of after the coating film treatment is stacked in the WC sintered-carbide die of packing into, and spraying boron nitride ceramics in the pressure head up and down of mould surface is as solder resist; Subsequently mould is placed between the last push-down head in the vacuum hotpressing stove, closes fire door; Furnace chamber is vacuumized; Vacuum reaches 10 in stove
-3Pa ~ 10
-4Utilize predefined temperature program(me) to heat behind the Pa, be incubated 30min ~ 2h after temperature reaches 420 ℃ ~ 470 ℃ in the stove, implement vacuum diffusion welding and connect; Treat weldment and apply axial compressive force 3MP ~ 10MPa before holding stage, holding stage is laid down pressure after finishing; Powered-down, weldment is taken out in stove cooling back;
Through above-mentioned steps, realize the interlayer Diffusion Welding of magnesium alloy mother metal and aluminium alloy mother metal.
2. the interlayer diffusion welding method of magnesium alloy as claimed in claim 1 and aluminium alloy, its characteristics are: described organic solvent is absolute ethyl alcohol or acetone.
3. the interlayer diffusion welding method of magnesium alloy as claimed in claim 1 and aluminium alloy, its characteristics are: it is that 99.99% copper target is as target that described magnetron sputtering technique adopts purity.
4. the interlayer diffusion welding method of magnesium alloy as claimed in claim 1 and aluminium alloy, its characteristics are: in deposition Cu thin-film process, the vacuum of sample room is 1.0 * 10
-3Pa ~ 1.0 * 10
-4Pa.
5. the interlayer diffusion welding method of magnesium alloy as claimed in claim 1 and aluminium alloy, its characteristics are: in deposition Cu thin-film process, its technology is: underlayer temperature is 80 ℃ ~ 200 ℃, heating rate is 5 ℃ ~ 15 ℃, sputtering power is 80W ~ 150W, ar pressure is 0.5Pa ~ 1.5Pa, and sedimentation time is 30min ~ 1.5h.
6. the interlayer diffusion welding method of magnesium alloy as claimed in claim 1 and aluminium alloy, its characteristics are: in the vacuum diffusion welding termination process, programming rate adopts the multistep cascade raising temperature, specifically be that first heating rate by 5 ℃～10 ℃/min is warming up to 320 ℃～370 ℃, the heating rate with 2 ℃～10 ℃/min rises to 420 ℃～470 ℃ then.
7. the interlayer diffusion welding method of magnesium alloy as claimed in claim 1 and aluminium alloy, its characteristics are: described magnesium alloy mother metal is pure magnesium, AZ31B or MB2 magnesium alloy.
8. the interlayer diffusion welding method of magnesium alloy as claimed in claim 1 and aluminium alloy, its characteristics are: described aluminium alloy mother metal is fine aluminium, LY12 or 6061 aluminium alloys.
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