CN109735746A - A kind of raising aluminum alloy heat stability and superplastic preparation method - Google Patents
A kind of raising aluminum alloy heat stability and superplastic preparation method Download PDFInfo
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Abstract
The invention proposes a kind of raising aluminum alloy heat stability and superplastic preparation methods, specific step is as follows: aluminium alloy cast ingot is placed in heating furnace by S1., 1-5 hours are kept the temperature at a temperature of 400 DEG C -600 DEG C, after carrying out homogenize process, homogeneous sample to be rolled is placed between two pieces of alloy-steel plates, and is placed under liquid nitrogen environment together and keeps the temperature 5-30 minutes；S2. cool down using through the cooling argon gas of liquid nitrogen to roll, to roller temperature control between -50 DEG C -0 DEG C, then by Jing Guo subzero treatment sample and steel plate carry out 1-3 passage heavy reduction deep cooling controlled rolling together, per pass deform drafts be 20-90%, obtain aluminum alloy plate materials.The present invention solves that single-phase aluminium alloy high high-temp stability is poor, is difficult to realize superplastic problem, significantly improves the thermal stability of single-phase aluminium alloy, is equally applicable to polynary aluminium alloy, magnesium alloy, copper alloy etc..
Description
Technical field
The present invention relates to metal material fields, more particularly to a kind of raising aluminum alloy heat stability and superplastic preparation
Method.
Background technique
Aluminium alloy has that density is low, specific strength is high as one kind non-ferrous metal structural material widest in industrial application
The advantages that.In recent years, gradually increased using the research that big distortion method prepares fine crystalline superplastic aluminium alloy.But due to
Ultra-fine Grained/nanocrystalline aluminum alloy obtained usually has a high density Non-equilibrium Grain Boundary, and when high temperature annealing or thermal deformation holds very much
Easily it is transformed into the coarse-grain of equilibrium state.Therefore, currently, focusing primarily upon the research of superplastic aluminum alloy containing dispersed and tiny
The alloy or hard fine grained of two-phase are uniformly distributed in the composite material of matrix.It is single-phase and more that the present invention provides a kind of raising binary
The alloy of first aluminum alloy heat stability and superplastic preparation method, preparation is made of multiple dimensioned mixed grain structure, and in grain boundaries
There are Segregation solute atom and cluster, alloy thermal stability is significantly improved.When high temperature deformation, on the one hand, occur in coarse-grain
Dynamic recrystallization can be so that reduce the driving force that fine grain is grown up by consumption storage；On the other hand, segregation and cluster are in crystal boundary
Crystal boundary energy can be effectively reduced to improve crystal boundary stability and pinning crystal boundary to inhibit crystal grain long in the solute atoms at place
Greatly, it cleverly solves the problems, such as that single-phase aluminium alloy high high-temp stability is poor, promotes the super modeling of aluminium alloy at a certain temperature
Property deformation.It is the preparation method simple process, reliable, it is suitable for processing large scale production piece, it is high-efficient, it is easy to spread, very
There is superplastic aluminium alloy, while being suitable for magnesium alloy, copper alloy suitable for preparation etc..
In recent years, it is concentrated mainly on about the research for improving aluminum alloy heat stability by adding metallic element such as scandium, zirconium
Etc. forming dispersed and tiny Second Phase Particle, to effectively pin dislocation, crystal grain when high-temperature heating/deformation be inhibited to grow up.For example, specially
Benefit 201310078494.0 discloses " a kind of preparation method of the wrought aluminium alloy of high thermal stability ", which passes through addition zirconium
And er element, the two combine and form the dispersed and tiny Al with good coarsening-resistant performance3(Er, Zr) compound phase, to mention
High-aluminium alloy thermal stability.But alloy thermal stability is improved by addition precious metal zirconium, erbium etc. and then considerably increases alloy
Cost.
Currently, the preparation about superplastic aluminum alloy plate is concentrated mainly in conventional hot rolling.For example, patent
It 201610283633.7 discloses " a kind of superplastic aluminum alloy plate and preparation method thereof ", the patent is by high temperature hot rolling and medium temperature
Hot rolling combines, and the rate that is laterally extended for preparing the plate of aluminium alloy is 235~245%, and longitudinal elongation percentage is 252~264%.
But the preparation method low efficiency, the heating and thermal insulation time is just up to 6-8 hours before only rolling.
Summary of the invention
That the purpose of the present invention is to solve single-phase aluminium alloy high high-temp stabilities is poor, is difficult to realize superplastic problem,
To provide a kind of single-phase aluminum alloy heat stability of raising and superplastic preparation method, which significantly improves single-phase aluminium and closes
The thermal stability of gold, is equally applicable to polynary aluminium alloy, magnesium alloy, copper alloy etc..
The technical scheme of the present invention is realized as follows:
Technical solution 1: a kind of raising aluminum alloy heat stability and superplastic preparation method, including high temperature homogenization knot
It closes liquid nitrogen deep processing and deep cooling rolls two steps, the specific steps are as follows:
S1. high temperature homogenization combination liquid nitrogen deep is handled: aluminium alloy cast ingot being placed in heating furnace, at 400 DEG C -600 DEG C
At a temperature of keep the temperature 1-5 hours, carry out homogenize process；Then, homogeneous sample to be rolled is placed between two pieces of alloy-steel plates,
And it is placed under liquid nitrogen environment together and keeps the temperature 5-30 minutes；
S2. deep cooling rolls: cool down using through the cooling argon gas of liquid nitrogen to roll, to roller temperature control -50 DEG C -
Between 0 DEG C, then by Jing Guo subzero treatment sample and steel plate carry out 1-3 passage heavy reduction deep cooling controlled rolling together, per pass
Deformation drafts is 20-90%, obtains aluminum alloy plate materials.
Technical solution 2: on the basis of technical solution 1, following improvement, high temperature homogenization described in step S1 are further done
Treatment temperature is 450 DEG C -550 DEG C, and the time is 2-4 hours；The sample and steel plate soaking time under liquid nitrogen environment is 10-
20 minutes.
Technical solution 3: on the basis of technical solution 1, following improvement is further done, is deformed per pass described in step S2
Drafts is 50-85%.
Technical solution 4: on the basis of technical solution 1, following improvement is further done, the aluminium alloy is selected from Al-7Mg
(wt.%), Al-9Mg (wt.%), Al-10Sn (wt.%), Al-10Zn (wt.%), Al-9Mg-0.7Mn (wt.%), Al-
One of 9Mg-0.5Cu (wt.%).
Technical solution 5: on the basis of technical solution 1, following improvement is further done, the aluminium alloy could alternatively be magnesium
Alloy or copper alloy.
The invention has the following advantages that 1) preparation method is using high temperature homogenization combination liquid nitrogen deep means processing sample
Product realize that solute atoms maintains the high solid solution condition of over-saturation in matrix；
2) heterogeneous deformation is introduced by the auxiliary rolling of heavy reduction deep cooling steel plate, mixed grain structure is promoted to be formed；Using rolling
The crystal defects such as the high density vacancy formed during system and dislocation promote solute atoms to be enriched with along Non-equilibrium Grain Boundary, and the solute is inclined
It is poly- that crystal boundary energy and pinning crystal boundary is effectively reduced, improve alloy grain thermal structure stability；
3) in High-temperature Superplasticity deformation, the dynamic recrystallization occurred in coarse-grain can be so that reduce fine grain by consumption storage
The big driving force of grain length；Meanwhile solute segregation can stabilized matrix fine grained texture, be conducive to crystal boundary rotate, finally realize superplasticity；
4) preparation method is more suitable for compared with big distortion mode (such as Equal-channel Angular Pressing and high pressure torsion)
Produce large scale industrial materials, high-efficient, application easy to spread；
5) preparation method is suitable for that binary is single-phase and polynary aluminium alloy, also can be used for preparing other magnesium alloys, copper alloy
Deng.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the drawing by high temperature curve of Al-9Mg (wt%) alloy prepared by embodiment 2.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one
S1. high temperature homogenization combination liquid nitrogen deep is handled: Al-7Mg (wt.%) alloy cast ingot is placed in heating furnace,
500 DEG C keep the temperature 3 hours, carry out homogenizing anneal processing；Then, the Al-7Mg alloy that will homogenize be placed on two pieces of alloy-steel plates it
Between, and be placed under liquid nitrogen environment together and keep the temperature 10 minutes；
S2. deep cooling rolls: cool down using through the cooling argon gas of liquid nitrogen to roll, roll is made to be in cryogenic, after
By Jing Guo subzero treatment sample and steel plate carry out 1 passage heavy reduction deep cooling controlled rolling together, drafts 84% is had
There are high thermal stability and superplastic aluminum alloy plate materials.
Embodiment two
S1. high temperature homogenization combination liquid nitrogen deep is handled: Al-9Mg (wt.%) alloy cast ingot is placed in heating furnace,
500 DEG C keep the temperature 3 hours, carry out homogenizing anneal processing；Then, Al-9Mg (wt.%) alloy that will homogenize is placed on two pieces of conjunctions
Between golden steel plate, and it is placed under liquid nitrogen environment together and keeps the temperature 10 minutes；
S2. deep cooling rolls: cool down using through the cooling argon gas of liquid nitrogen to roll, roll is made to be in cryogenic, after
By Jing Guo subzero treatment sample and steel plate carry out 2 passage heavy reduction deep cooling controlled rollings together, front and back draught per pass difference
For 70% and 50%, overall reduction 84% is obtained with high thermal stability and superplastic aluminum alloy plate materials.
Through detecting, which still maintains substructure tissue after annealing 24 hours at 275 DEG C,
When high temperature stretches, the extension of acquisition is higher than 400%, and drawing by high temperature curve is as shown in Figure 1.
Embodiment three
S1. high temperature homogenization combination liquid nitrogen deep is handled: Al-10Zn (wt.%) alloy cast ingot is placed in heating furnace,
470 DEG C keep the temperature 2 hours, carry out homogenizing anneal processing；Then, Al-10Zn (wt.%) alloy that will homogenize is placed on two pieces of conjunctions
Between golden steel plate, and it is placed under liquid nitrogen environment together and keeps the temperature 10 minutes；
S2. deep cooling rolls: cool down using through the cooling argon gas of liquid nitrogen to roll, roll is made to be in cryogenic, after
By Jing Guo subzero treatment sample and steel plate carry out 2 passage heavy reduction deep cooling controlled rollings together, front and back draught per pass difference
For 70% and 50%, overall reduction 82% is obtained with high thermal stability and superplastic aluminum alloy plate materials.
Example IV
S1. high temperature homogenization combination liquid nitrogen deep is handled: Al-10Sn (wt.%) alloy cast ingot is placed in heating furnace,
550 DEG C keep the temperature 2 hours, carry out homogenizing anneal processing；Then, Al-10Sn (wt.%) alloy that will homogenize is placed on two pieces of conjunctions
Between golden steel plate, and it is placed under liquid nitrogen environment together and keeps the temperature 10 minutes；
S2. deep cooling rolls: cool down using through the cooling argon gas of liquid nitrogen to roll, roll is made to be in cryogenic, after
By Jing Guo subzero treatment sample and steel plate carry out 2 passage heavy reduction deep cooling controlled rollings together, front and back draught per pass difference
For 70% and 50%, overall reduction 83% is obtained with high thermal stability and superplastic aluminum alloy plate materials.
Embodiment five
S1. high temperature homogenization combination liquid nitrogen deep is handled: Al-9Mg-0.7Mn (wt.%) alloy cast ingot is placed in heating
Furnace keeps the temperature 3 hours at 500 DEG C, carries out homogenizing anneal processing；Then, Al-9Mg-0.7Mn (wt.%) alloy that will homogenize is put
It sets between two pieces of alloy-steel plates, and is placed under liquid nitrogen environment together and keeps the temperature 10 minutes；
S2. deep cooling rolls: cool down using through the cooling argon gas of liquid nitrogen to roll, roll is made to be in cryogenic, after
By Jing Guo subzero treatment sample and steel plate carry out 2 passage heavy reduction deep cooling controlled rollings together, front and back draught per pass difference
For 70% and 50%, drafts 85% is obtained with high thermal stability and superplastic aluminum alloy plate materials.
Embodiment six
S1. high temperature homogenization combination liquid nitrogen deep is handled: Al-9Mg-0.5Cu (wt.%) alloy cast ingot is placed in heating
Furnace keeps the temperature 3 hours at 500 DEG C, carries out homogenizing anneal processing；Then, Al-9Mg-0.5Cu (wt.%) alloy that will homogenize is put
It sets between two pieces of alloy-steel plates, and is placed under liquid nitrogen environment together and keeps the temperature 10 minutes；
S2. deep cooling rolls: cool down using through the cooling argon gas of liquid nitrogen to roll, roll is made to be in cryogenic, after
By Jing Guo subzero treatment sample and steel plate carry out 2 passage heavy reduction deep cooling controlled rollings together, front and back draught per pass difference
For 70% and 50%, drafts 83% is obtained with high thermal stability and superplastic aluminum alloy plate materials.
Comparative example one
S1. high temperature homogenization: being placed in heating furnace for Al-9Mg (wt.%) alloy cast ingot, keeps the temperature 3 hours at 500 DEG C, into
The processing of row homogenizing anneal；Then, Al-9Mg (wt.%) alloy that will homogenize is placed between two pieces of alloy-steel plates；
S2. room temperature rolling: sample and steel plate are carried out to 2 passage heavy reduction room temperature controlled rollings together, front and back is depressed per pass
Amount is respectively 70% and 50%, overall reduction 83%.
Through detecting, Al-9Mg made from this method (wt.%) alloy high temperature fracture elongation is lower than 200%.
Comparative example two
S1. high temperature homogenization combination liquid nitrogen deep is handled: Al-9Mg (wt.%) alloy cast ingot is placed in heating furnace,
500 DEG C keep the temperature 3 hours, carry out homogenizing anneal processing；Then, Al-9Mg (wt.%) alloy that will only homogenize is placed in liquid nitrogen ring
10 minutes are kept the temperature under border；
S2. deep cooling rolls: cool down using through the cooling argon gas of liquid nitrogen to roll, roll is made to be in cryogenic, after
Sample Jing Guo subzero treatment is subjected to 2 passage heavy reduction deep cooling controlled rollings, front and back draught per pass is respectively 70% He
50%, overall reduction 85%, the preparation flow does not use steel plate auxiliary rolling.
Through detecting, Al-9Mg made from this method (wt.%) alloy high temperature fracture elongation is lower than 250%.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of raising aluminum alloy heat stability and superplastic preparation method, it is characterised in that: including high temperature homogenization knot
It closes liquid nitrogen deep processing and deep cooling rolls two steps, the specific steps are as follows:
S1. high temperature homogenization combination liquid nitrogen deep is handled: aluminium alloy cast ingot being placed in heating furnace, in 400 DEG C of -600 DEG C of temperature
Lower heat preservation 1-5 hours carries out homogenize process；Then, homogeneous sample to be rolled is placed between two pieces of alloy-steel plates, and one
It rises to be placed under liquid nitrogen environment and keeps the temperature 5-30 minutes；
S2. deep cooling rolls: cooling down using through the cooling argon gas of liquid nitrogen to roll, controls roller temperature at -50 DEG C -0 DEG C
Between, then by Jing Guo subzero treatment sample and steel plate carry out 1-3 passage heavy reduction deep cooling controlled rolling together, deform per pass
Drafts is 20-90%, obtains aluminum alloy plate materials.
2. a kind of raising aluminum alloy heat stability and superplastic preparation method according to claim 1, it is characterised in that: step
High temperature homogenization treatment temperature described in rapid S1 is 450 DEG C -550 DEG C, and the time is 2-4 hours；The sample and steel plate is in liquid
Soaking time is 10-20 minutes under nitrogen environment.
3. raising aluminum alloy heat stability according to claim 1 and superplastic preparation method, it is characterised in that: step
Deforming drafts described in S2 per pass is 50-85%.
4. raising aluminum alloy heat stability according to claim 1 and superplastic preparation method, it is characterised in that: described
Aluminium alloy be selected from Al-7Mg (wt.%), Al-9Mg (wt.%), Al-10Sn (wt.%), Al-10Zn (wt.%), Al-9Mg-
One of 0.7Mn (wt.%), Al-9Mg-0.5Cu (wt.%).
5. raising aluminum alloy heat stability according to claim 1 and superplastic preparation method, it is characterised in that: described
Aluminium alloy could alternatively be magnesium alloy or copper alloy.
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| CN111360070A (en) * | 2020-02-13 | 2020-07-03 | 中南大学 | Method for improving high-temperature plasticity of 5xxx aluminum alloy |
| CN111549266A (en) * | 2020-05-27 | 2020-08-18 | 北京科技大学 | Tissue regulation and control method for improving forming performance of aluminum alloy plate of vehicle body structure |
| CN111575617A (en) * | 2020-05-26 | 2020-08-25 | 中国航发北京航空材料研究院 | Heat treatment method of corrosion-resistant Al-Mg alloy |
| CN111910108A (en) * | 2020-08-12 | 2020-11-10 | 吉林大学 | Forming preparation method of high-alloy-content aluminum alloy plate |
| CN112553548A (en) * | 2020-11-12 | 2021-03-26 | 淮阴工学院 | Method for improving obdurability of aluminum-magnesium alloy welding wire |
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| CN111910108A (en) * | 2020-08-12 | 2020-11-10 | 吉林大学 | Forming preparation method of high-alloy-content aluminum alloy plate |
| CN111910108B (en) * | 2020-08-12 | 2022-01-25 | 吉林大学 | Forming preparation method of high-alloy-content aluminum alloy plate |
| CN112553548A (en) * | 2020-11-12 | 2021-03-26 | 淮阴工学院 | Method for improving obdurability of aluminum-magnesium alloy welding wire |
| CN112553548B (en) * | 2020-11-12 | 2021-10-19 | 淮阴工学院 | Method for improving obdurability of aluminum-magnesium alloy welding wire |
| CN115627374A (en) * | 2022-10-24 | 2023-01-20 | 江苏理工学院 | 7xxx high-strength aluminum alloy wire for electric arc welding and preparation method thereof |
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