CN115216714A - Method for inhibiting beta' phase precipitation, regulation and recrystallization of 2195 aluminum alloy formed by spraying - Google Patents
Method for inhibiting beta' phase precipitation, regulation and recrystallization of 2195 aluminum alloy formed by spraying Download PDFInfo
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- CN115216714A CN115216714A CN202210803168.0A CN202210803168A CN115216714A CN 115216714 A CN115216714 A CN 115216714A CN 202210803168 A CN202210803168 A CN 202210803168A CN 115216714 A CN115216714 A CN 115216714A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/057—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
- B22F2003/185—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers by hot rolling, below sintering temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
- B22F2003/208—Warm or hot extruding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
Abstract
The invention belongs to the field of aluminum alloy processing and manufacturing, and discloses a method for inhibiting beta' phase precipitation, regulation and recrystallization of a 2195 aluminum alloy formed by spraying, which comprises the following steps: preparing raw materials according to the composition of alloy elements of 2195 aluminum alloy, and casting an ingot blank by adopting a rapid solidification spray forming process; and extruding and cogging the sprayed ingot blank, sequentially carrying out two-stage homogenization, high-temperature rolling, solution heat treatment and artificial aging treatment, and adding quenching cooling in each process after extrusion, wherein the quenching transfer time is not more than 5S. The invention firstly crushes the T1 phase through hot extrusion deformation and melts back to the matrix, and then carries out treatment such as bipolar homogenization and the like, and regulates and controls the precipitated beta 'phase to present a uniform and dispersed distribution state, thereby having more effective inhibition for subsequent relative beta' recrystallization.
Description
Technical Field
The invention belongs to the field of aluminum alloy processing and manufacturing, and particularly relates to a method for inhibiting beta' phase precipitation, regulation and recrystallization of a spray-formed 2195 aluminum alloy.
Background
2195 aluminium alloy is widely used in aerospace structural parts. Because of its excellent properties such as low density, high strength and corrosion resistance, it has been increasingly paid attention to and used in the field of aerospace. On a large passenger plane, the manufactured organic wing is mainly applied to the upper surface skin and the stringer; front wing spar, rear wing spar, wing rib; fuselage bulkhead, stringer; brackets, pressure plate folding devices, protection plates and the like.
Spray forming is used as a novel rapid solidification alloy preparation method, and a new step is provided for industrial manufacture of large-scale and large-batch alloy ingot blanks. A liquid drop jet flow is formed in high-flow-rate protector gas, and after flying cooling, the liquid drop jet flow exchanges heat with atomizing gas in the process, the cooling speed can reach 103-104K/s, and the rapid solidification effect is achieved. Has the advantages of uniform ingot blank components and fine initial crystal grains. The 2195 Al alloy is prepared by spray forming casting process and is applied more deeply.
The large-size ingot blanks in factories to the alloy plates need to pass through the deformation process of cogging and rolling, and then the better comprehensive alloy performance is obtained through solid solution and aging treatment. And the cogging process mainly comprises forging cogging and extrusion cogging. The extrusion processing has more advantages, such as more efficient production and better loose welding effect on the ingot blank. However, in application, the phenomenon of abnormal growth of surface layer crystal grains of the plate occurs in the extrusion cogging 2195, the properties of material strength, corrosion resistance and the like are deteriorated, and solution is needed.
The main reason for the recrystallization or abnormal grain growth of the spray-formed 2195 deformed sheet is the superposition of two deformation processes of extrusion and rolling, because the extrusion cylinder and the roller act on the surface of the material to generate huge friction force, the deformation of the surface of the material is larger than that of the core, and the friction in the deformation process generates huge heat to act on the surface of the deformed material, so that the surface tissue stores a large amount of stored energy, and the superposition of two successive core-changing processes also superposes the stored energy and the deformation. During the subsequent solution treatment, the high temperature drives the atoms and the stored energy is excited in the form of recrystallization to re-crystallize the surface structure. The recrystallization effect is shown in FIG. 1.However, in the 2xxx series alloys, spherical Al of nanometer size 3 The Zr phase is coherent with the matrix, the thermal stability is good, the dislocation and the migration of crystal boundary can be pinned in the matrix, and the recrystallization inhibition effect is achieved. And, spherical Al 3 The smaller the Zr phase size, the higher the phase density, the more uniform the distribution, and the stronger the recrystallization-inhibiting ability.
Disclosure of Invention
In view of the above, the present invention provides a method for inhibiting β ' phase precipitation, regulation and recrystallization of a 2195 aluminum alloy by spray forming, which aims to solve the problem of abnormal growth of surface layer grains in the existing process flow, and uses a two-stage homogenization to regulate β ' phase precipitation, and the precipitation distribution of the β ' phase precipitation can be controlled by means of process sequence.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a method for inhibiting beta' phase precipitation, regulation and recrystallization of a spray-formed 2195 aluminum alloy, which comprises the following steps: preparing raw materials according to the composition of alloy elements of 2195 aluminum alloy, and casting an ingot blank by adopting a rapid solidification spray forming process; and extruding and cogging the sprayed ingot blank, sequentially carrying out two-stage homogenization, high-temperature rolling, solution heat treatment and artificial aging treatment, and adding quenching cooling in each process after extrusion, wherein the quenching transfer time is not more than 5S.
Preferably, the extrusion system is: the extrusion temperature is 460-480 ℃, the extrusion speed is 1.7-1.9mm/s, and the extrusion ratio is not lower than 9.
Preferably, the two-stage homogenization regime is: at a slow heating rate V Heating 1 Heating the aluminum alloy to a temperature T1 within the temperature range of 300-400 ℃ and preserving heat, wherein the temperature is more than or equal to V at 40 ℃/min Heating 1 More than or equal to 10 ℃/min, the heat preservation time t1 is 5-20h, and then the rapid heating rate V is adopted Heating 2 Heating the aluminum alloy to a temperature T2 within the temperature range of T1-475 ℃ and preserving heat, wherein the temperature is more than or equal to V at 100 ℃/min Heating 2 More than or equal to 50 ℃/min, and the heat preservation time t2 is 20-30h.
Preferably, the high-temperature rolling schedule is as follows: rolling at 470 + -5 deg.C, and keeping the temperature for 18-25min.
Preferably, the high-temperature rolling is carried out by multiple passes, and the time for returning and heat preservation after each pass is not less than 5min.
Preferably, the deformation amount of the high-temperature rolling is not more than 60%.
Preferably, the solution heat treatment schedule is: keeping the temperature for 2-2.5h under the heating condition of 510 plus or minus 5 ℃.
Preferably, the artificial aging treatment system comprises: keeping the temperature for 12-20h under the condition of oil bath at 170 +/-5 ℃.
Preferably, the quench cooling is water quenching.
The beneficial effects of the invention are: the method for inhibiting beta' phase precipitation, regulation and recrystallization of the spray-formed 2195 aluminum alloy comprises the steps of crushing a T1 phase through hot extrusion deformation, remelting the crushed T1 phase to a matrix, performing bipolar homogenization and other treatments, and effectively promoting the rare earth element Zr to be spherical Al 3 Zr nano-scale particles are precipitated, and a precipitated beta 'phase is regulated and controlled to present a uniform and dispersed distribution state, so that the Zr nano-scale particles have a more effective inhibiting effect on beta' recrystallization in the subsequent thermal mechanical treatment and thermal treatment processes. In addition, for elements with high alloy content, the primary second phase is fully dissolved back, so that the supersaturated solid solution is more uniform.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a surface layer coarse grain morphology diagram of a conventional injection molded 2195 plate;
FIG. 2 shows a conventional Process flow (Process 1) for spray forming 2195 plate material vs. beta' (Al) 3 Zr) phase distribution regulation;
FIG. 3 shows the Process flow (Process 2) for spray forming 2195 plates versus β' (Al) according to the present invention 3 Zr) phase distribution regulation;
4-5 show the phase distribution of a conventional injection-molded 2195 ingot T1;
FIG. 6 is a diagram of the distribution of the second phase in an extruded state prior to homogenization treatment in accordance with the present invention;
fig. 7-9 show the crystallization states for different process flows: (a) "spray forming-extrusion-rolling-solution aging" 2195 plate, (b) Process1 "spray forming-homogenizing-extrusion-rolling-solution aging" 2195 plate, (c) Process2 "spray forming-extrusion-homogenizing-rolling-solution aging" 2195 plate;
fig. 10-11 are diagrams of the core recrystallization effect under different process flows: (a) Process1 "spray forming-homogenizing-extrusion-rolling-solution aging" 2195 sheet material, (b) Process2 "spray forming-homogenizing-extrusion-rolling-solution aging" 2195 sheet material.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Carry out homogenization treatment to the ingot blank for current application is more, comparatively traditional, promptly: the method is named as Process1, the controllable 2195 aluminum alloy has Al3Zr phase segregation and is straight-chain, the recrystallization inhibition capability is improved to a certain extent, but the non-uniform distribution has limitation on recrystallization inhibition; in the present embodiment, the method for suppressing the beta' phase precipitation and controlled recrystallization of the spray-formed 2195 aluminum alloy includes: "spray forming-extrusion-homogenization-rolling-solution aging" (named Process 2), placing homogenization treatment before extrusion to regulate and control Al 3 Zr phase is distributed uniformly and dispersedly, and Al is reduced 3 The Zr phase has no precipitation zone width around the grain boundary, and the optimized microstructures strengthen the recrystallization inhibiting effect of the alloy. The specific process steps compriseThe following were used:
preparing raw materials according to the composition of alloy elements of 2195 aluminum alloy, and casting an ingot blank by adopting rapid solidification and spray forming;
and step two, extruding and cogging the injection-state ingot blank, wherein the purpose of extrusion is to cogging the ingot blank and preliminarily reduce the size of the ingot blank material. The extrusion system is as follows: the extrusion temperature is 470 ℃, the extrusion speed is 1.8mm/s, and the extrusion ratio is 9;
step three, adding water quenching in bipolar homogenization treatment, wherein a two-stage homogenization system is as follows: at a slow heating rate V Heating 1 Heating aluminum alloy to a temperature T1=350 ℃ in the temperature range of 300 ℃ to 400 ℃ and holding time T1=10h, =30 ℃/h, followed by rapid heating rate V Heating 2 =50 ℃ heating the aluminium alloy to a temperature T2=470 ℃ in the temperature range 350 ℃ to 475 ℃ and holding time T2=24h; water quenching is carried out again, and the transfer time of the water quenching is not more than 5S;
step four, high-temperature rolling forming, wherein the high-temperature rolling schedule is as follows: rolling at 470 deg.C, and keeping the temperature for 20min; and the rolling is finished and the furnace returning is kept for 5min in each pass, and the water quenching is finished in the last pass; the water quenching transfer time does not exceed 5S; the maximum rolling deformation is 60 percent.
Step five, carrying out solution heat treatment along with the furnace, wherein the solution heat treatment system is as follows: keeping the temperature for 2 hours under the heating condition of 510 ℃, and then cooling by water;
step six, carrying out artificial aging treatment, wherein the artificial aging treatment system is as follows: keeping the temperature for 12h under the condition of oil bath at 170 ℃ and then cooling the water.
Example results are characterized as: the β 'phase is precipitated in a chain form having an orientation distribution ("changed-like grown β' phase") as compared with the conventional Process 1. Through the Process2, the T1 phase formed by hot extrusion and spray forming is subjected to pre-step remelting, and then subjected to bipolar homogenization treatment, so that the precipitated beta' phase is regulated and controlled to present a uniform and dispersed distribution state. The beta 'phase regulation results of the Process1 and the Process2 have the advantage that the uniform and dispersed beta' phase relative to the recrystallization is more effectively inhibited as shown in FIGS. 2-3.
The two specific reasons for this difference are: 2195 alloy spray formed ingot blank structure with rich grainsThe particularity of the T1-rich phase is that the T1 phases are Needle-like and have a fixed angle of 70.5 ° with respect to each other, as shown in FIGS. 4-5, which are labeled "Needle-like phases". Various characteristics of the T1 phase, such as high numerical density, abundant dislocation of entanglement around the phase and the like, lead to uniform regulation and precipitation of Al on the ingot blank 3 Almost all Zr nanophase takes the T1 phase as a nucleation point, and is segregated in a partial manner. The Process of the present invention (Process 2) places the extrusion before the homogenization Process. The T1 phase is crushed by hot extrusion and is dissolved in the matrix, the remelting effect is shown in FIG. 6, and the T1 phase is completely redissolved. This provides favorable conditions for the subsequent homogenization process to be uniform and to disperse and precipitate Al3Zr, which is also the starting point for the important difference between the process method of the invention and the traditional process method.
After the final spray-formed 2195 plate is subjected to high-temperature rolling, solution heat treatment and artificial aging treatment, the recrystallized state is as shown in fig. 9, the size and thickness of the abnormally-grown recrystallized grains on the surface of the plate are obviously reduced, and the thickness of the coarse crystal layer is reduced to be less than 50 μm. As shown in FIG. 8, the Process1 adds a homogenization treatment, so that the coarse crystal layer is also thinned to a certain extent, but the thickness of the coarse crystal layer is about 80-100 μm. FIG. 7 shows a 2195 spray-formed sheet that did not involve homogenization, for comparison.
Meanwhile, the dispersed beta' phase not only has better inhibition effect on a coarse crystal layer, but also has better inhibition effect on the isometric fine recrystallization of the core part of the sheet material, and the core recrystallization effect is shown in figures 10-11. In fig. 10, the Process1 Process exhibited more equiaxed recrystallized grains, and the presence of these grains would decrease the final tensile strength of the sheet. In fig. 11, the Process2 Process has a strong recrystallization-inhibiting effect due to the dispersed β', and the alloy retains more lath-shaped deformed grains.
Thus, for spray formed 2195 aluminum alloys, the alloy Al can be applied whether the two-stage homogenization treatment is applied before extrusion or after extrusion 3 Zr is regulated and precipitated, and abnormal growth of crystal grains on the surface layer of the final solid solution plate is inhibited. But the ingot blank is homogenized by the traditional process, and Al 3 The Zr phase is separated out in a chain shape, and has limited recrystallization inhibition effect; and is added uniformly before extrusionIn particular two-stage homogenization, of Al 3 Zr phase is dispersed and separated out, so that the inhibition effect on the thickness of a coarse crystal layer is better, and the inhibition or weakening effect on in-crystal recrystallization is also realized.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. The method for inhibiting beta' phase precipitation, regulation and recrystallization of the 2195 aluminum alloy formed by spraying comprises the following steps: preparing raw materials according to the composition of alloy elements of 2195 aluminum alloy, and casting an ingot blank by adopting a rapid solidification spray forming process, and is characterized by also comprising the following steps of: and extruding and cogging the sprayed ingot blank, sequentially carrying out two-stage homogenization, high-temperature rolling, solution heat treatment and artificial aging treatment, and adding quenching cooling in each process after extrusion, wherein the quenching transfer time is not more than 5S.
2. The method for inhibiting beta' phase precipitation regulation and recrystallization of a spray-formed 2195 aluminum alloy as claimed in claim 1, wherein the extrusion system is as follows: the extrusion temperature is 460-480 ℃, the extrusion speed is 1.7-1.9mm/s, and the extrusion ratio is not lower than 9.
3. The method for inhibiting beta' phase precipitation regulation and recrystallization of a spray-formed 2195 aluminum alloy as claimed in claim 1, wherein the two-stage homogenization system is as follows: at a slow heating rate V Heating 1 Heating the aluminum alloy to a temperature T1 within the temperature range of 300-400 ℃ and preserving heat, wherein the temperature is more than or equal to V at 40 ℃/min Heating 1 More than or equal to 10 ℃/min, the heat preservation time t1 is 5-20h, and then the rapid heating rate V is adopted Heating 2 Heating the aluminum alloy to a temperature T2 within the temperature range of T1-475 ℃ and preserving heat, wherein the temperature is more than or equal to V at 100 ℃/min Heating 2 More than or equal to 50 ℃/min, and the heat preservation time t2 is 20-30h.
4. The method for suppressing beta' phase precipitation regulated recrystallization of a spray-formed 2195 aluminum alloy as claimed in claim 1, wherein the high-temperature rolling schedule is: rolling at 470 + -5 deg.C, and keeping the temperature for 18-25min.
5. The method for inhibiting beta' phase precipitation, regulation and recrystallization of the spray-formed 2195 aluminum alloy as claimed in claim 4, wherein the high-temperature rolling is performed in multiple passes, and the temperature of the rolling in each pass is not less than 5min after the rolling in the furnace is completed.
6. The method for suppressing beta' phase precipitation-controlled recrystallization of a spray-formed 2195 aluminum alloy as claimed in claim 4, wherein the amount of deformation by high-temperature rolling is not more than 60%.
7. The method for suppressing beta' precipitation-mediated recrystallization of a spray-formed 2195 aluminum alloy as claimed in claim 1, wherein the solution heat treatment schedule is: keeping the temperature for 2-2.5h under the heating condition of 510 plus or minus 5 ℃.
8. The method for inhibiting beta' phase precipitation regulated recrystallization of a spray-formed 2195 aluminum alloy as claimed in claim 1, wherein the artificial aging treatment regime is as follows: keeping the temperature for 12-20h under the condition of oil bath at 170 +/-5 ℃.
9. The method for suppressing beta' phase precipitation-controlled recrystallization of a spray-formed 2195 aluminum alloy as claimed in claim 1, wherein the quenching cooling is water quenching.
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| WO2021008428A1 (en) * | 2019-07-17 | 2021-01-21 | 中南大学 | Ultrahigh-strength aluminum-lithium alloy and preparation method therefor |
| CN113403508A (en) * | 2021-06-22 | 2021-09-17 | 江苏豪然喷射成形合金有限公司 | Heat treatment process for spray-formed high-silicon wear-resistant aluminum alloy |
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2022
- 2022-07-07 CN CN202210803168.0A patent/CN115216714A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2000000653A1 (en) * | 1998-06-15 | 2000-01-06 | University Of Virginia Patent Foundation | Method of producing superplastic alloys and superplastic alloys produced by the method |
| CN102021457A (en) * | 2010-10-27 | 2011-04-20 | 中国航空工业集团公司北京航空材料研究院 | High-toughness aluminum lithium alloy and preparation method thereof |
| CN108570633A (en) * | 2018-05-21 | 2018-09-25 | 江苏大学 | Improve the preparation method of 6xxx line aluminium alloy friction and wear behaviors |
| CN110172623A (en) * | 2019-03-11 | 2019-08-27 | 中国航发北京航空材料研究院 | A kind of high tough aluminium alloy and preparation method thereof |
| WO2021008428A1 (en) * | 2019-07-17 | 2021-01-21 | 中南大学 | Ultrahigh-strength aluminum-lithium alloy and preparation method therefor |
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