CN110453123A - The method for preparing aluminium lithium alloy - Google Patents
The method for preparing aluminium lithium alloy Download PDFInfo
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- CN110453123A CN110453123A CN201910723329.3A CN201910723329A CN110453123A CN 110453123 A CN110453123 A CN 110453123A CN 201910723329 A CN201910723329 A CN 201910723329A CN 110453123 A CN110453123 A CN 110453123A
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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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0408—Light metal alloys
- C22C1/0416—Aluminium-based alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
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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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling
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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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/042—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling using a particular milling fluid
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The present invention provides a kind of method for preparing aluminium lithium alloy；Including following procedure: 1) according to quality proportioning (94-95): (3.5-4.5): 1 chooses aluminium powder, copper powder and lithium bits；2) aluminium powder, copper powder and lithium bits and suitable process control agent are placed in ball grinder under protectiveness atmosphere, a certain amount of abrading-ball is added, carries out ball milling under protectiveness atmosphere later, obtains the powder of aluminium lithium alloy；The molding of aluminium lithium alloy.This method process is simple, has a universality, repeatability, obtained aluminium lithium alloy ingredient performance is stable, it is controllable, can match in excellence or beauty with the aluminium lithium alloy of current commercialization.
Description
Technical field
The present invention relates to a kind of new methods that aluminium lithium alloy is prepared using mechanical attrition method, belong to the preparation neck of aluminium lithium alloy
Domain.
Background technique
Aluminium alloy has many advantages, such as low-density, high intensity, good corrosion-resistant and easy processing, is widely used in aviation boat
It, communications and transportation, the industries such as electron electric power.Traditional aluminium alloy more add the heavier alloying element such as copper, magnesium, zinc, be difficult into
Low-alloyed weight drops in one step, meets the needs of continuous development.Elemental lithium can be formed as metal most light in the world with aluminium
Solid solution forms Al after timeliness3Li phase, will form Al in the case where there is copper2CuLi phase, this be a kind of strengthening effect very
Good precipitated phase.Moreover, the lithium of every addition 1% can just make its density reduce by 3% in aluminum substrate, Young's modulus increases by 6%.
Therefore, countries in the world have begun to the research and development of aluminium lithium alloy from the fifties in last century.It is compared with traditional aluminum alloy materials, aluminium lithium
Alloy has lower density, high specific strength, excellent corrosion resistance, anti-fatigue performance and cryogenic property.By nearly 80 years
Research and development, aluminium lithium alloy have been realized in it is extensive stabilize preparation, and developed many trades mark, be widely used in aircraft and
On space flight equipment, replace conventional aluminum alloys with it, structural member loss of weight 10%-15% can be made, rigidity improves 15%-20%.
So far, the preparation of aluminium lithium alloy is mainly by the method for melting and casting.But due to the low-density of lithium, low
Fusing point, high activity and certain toxicity cause certain difficulty to aluminium lithium alloy.Because lithium in the molten state can be with
Oxygen, carbon dioxide, vapor and nitrogen in air react, so the melting of aluminium lithium alloy is generally in protective atmosphere
Perhaps bath surface is carried out in the case where having the fuse salt of lithium to cover or is directly carried out under vacuum conditions.Certainly, lithium plus
Entering can also be added in the form of aluminium lithium intermediate alloy, and aluminium lithium intermediate alloy is obtained by electrolysis method.The height of lithium is living
Property is doomed to lead to the loss of lithium during melting and casting, it is desirable to which the aluminium lithium alloy for obtaining predetermined ingredient must be to the loss of lithium
Have it is certain estimate, this brings great challenge for the Composition Control of alloy.In addition, due to the density variation of lithium and aluminium ratio
It is larger, therefore obtaining the evenly dispersed of lithium in casting process is also a crucial problem.
Powder metallurgic method is to grow up directly to prepare the one of alloy or composite material using metal powder in recent years
Kind new technology, has been widely used in traffic, machinery, electronics, aerospace, weapons, biology, new energy, information and nuclear industry
Equal fields become in new material science most one of the branch of development vitality.PM technique have significant energy conservation, material saving,
It has excellent performance, the series of advantages such as Product Precision is high and stability is good, is very suitable for producing in enormous quantities.Currently, favorably
It is directly synthetically prepared the report of other aluminium alloys with element powders, also achieves relatively good effect, such as aluminium-cooper-maganesium alloy, aluminium
Copper magnesium-zinc alloy etc..But due to the high activity of lithium and there is no industrialized lithium powder available, it is prepared using powder metallurgic method
The research of aluminium lithium alloy is limited only to prepare block materials using the second generation aluminium lithium alloy powder of atomization come compacting sintering, this is right
No any effect is prepared in aluminium lithium alloy primary, both at home and abroad there is not yet related directly prepare aluminium lithium alloy using element powders
Report.
Summary of the invention
The purpose of the present invention is to provide a kind of new sides for preparing aluminium lithium alloy by powder metallurgical technique using element powder
Method.This method can be applied to the preparation of the aluminium lithium alloy of heterogeneity, and this method process is simple, has universality, repeats
Property, obtained aluminium lithium alloy ingredient performance is stable, it is controllable, can match in excellence or beauty with the aluminium lithium alloy of current commercialization.It is above-mentioned to realize
Purpose, the present invention are to be realized by the following technical programs,
A method of preparing aluminium lithium alloy；Its feature includes following procedure:
1) according to quality proportioning (94-95): (3.5-4.5): 1 chooses aluminium powder, copper powder and lithium bits；
2) aluminium powder, copper powder and lithium bits and suitable process control agent are placed in ball grinder under protectiveness atmosphere, are added
A certain amount of abrading-ball carries out ball milling under protectiveness atmosphere later, obtains the powder of aluminium lithium alloy.
3) molding of aluminium lithium alloy
Carry out aluminium lithium alloy powder cold moudling made from step 2) and under argon atmosphere high temperature sintering, sintering temperature
It is 520-600 degrees Celsius, carries out hot extrusion later, extrusion temperature is 400-520 degrees Celsius, and corresponding aluminium lithium can be obtained and close
Gold.
The mass fraction that process control agent is added is the 0.5%-1% of alloy powder total weight.It will under protectiveness atmosphere
The element of aluminium powder, copper powder and lithium bits and other microalloyings including one of Mg, Ag, Zn and Zr or a variety of and suitable
The process control agent of amount is placed in ball grinder.Ratio of grinding media to material is between 5-30.Rotational speed of ball-mill is 300-600rpm, and Ball-milling Time is
4-48 hours.
It is 300-800MPa, extrusion ratio 16:1-25:1 by the pressure of obtained aluminium lithium alloy powder cold moudling.
The invention has the following advantages that operation is simple for this method first；It is avoided secondly by the method that solid-state mixes
The problem of aluminium lithium density variation easily causes uneven components in casting；This method avoids the elemental lithium damages in casting process
Mistake problem is easier to realize the Composition Control of aluminium lithium alloy；Last this method is suitable for the system of the aluminium lithium alloy of heterogeneity
Standby, can expand aluminium lithium alloy can scope of design and application range.
The invention proposes a kind of new methods for preparing aluminium lithium alloy by powder metallurgical technique using element powder, for not
Congruent aluminium lithium alloy has universality, and obtained aluminium lithium alloy stable components performance is excellent, in the preparation side of aluminium lithium alloy
There is preferable prospect in face.
Detailed description of the invention
Fig. 1 is the pattern of the alloy powder that obtains after ball milling in embodiment 1 under scanning electron microscope.
Fig. 2 is the tensile stress strain curve of the aluminium lithium alloy obtained after squeezing in embodiment 1.
Fig. 3 is the timeliness firmness change of obtained aluminium lithium alloy in 120 degree of timeliness after squeezing in embodiment 1.
Fig. 4 is bent for tensile stress-strain of the aluminium lithium alloy after extruding in embodiment 1 under 120 degree after timeliness 26 hours
Line.
Fig. 5 is pattern of the aluminium lithium alloy powder under scanning electron microscope in embodiment 2 after ball milling.
Fig. 6 is bent for tensile stress-strain of the aluminium lithium alloy after extruding in embodiment 2 under 120 degree after timeliness 24 hours
Line.
Tensile stress strain curve of the Fig. 7 for aluminium lithium alloy after extruding in embodiment 3 under 175 degree after timeliness 8 hours.
Specific embodiment
The present invention is further illustrated below with reference to embodiment, and the embodiments are used only to illustrate the invention for these, is not intended to limit this
Invention.
Embodiment 1
The aluminium powder of mass fraction 95%, 4% copper powder and 1% lithium bits are placed in ball grinder, 1% stearic acid is added
As process control agent, ten times of steel ball of powder quality is added as ball-milling medium, is filled with argon gas as protective atmosphere.Later
The powder of Al4Cu1Li is obtained in 8 hours of 500 turns of lower ball millings.By the cold moudling under 500MPa pressure of above-mentioned powder, later
Being warming up to 600 degrees Celsius of one hours of heat preservation under argon atmosphere with 2 degrees/min of heating rate can be obtained alloy block,
Hot extrusion molding is then carried out to further increase its consistency with the extrusion ratio of 25:1 under 520 degree.It is obtained after ball milling
Alloy powder in the pattern under scanning electron microscope as shown in Figure 1, the tensile stress strain curve of aluminium lithium alloy obtained after squeezing such as
Shown in Fig. 2, timeliness firmness change after 510 degree of solid solutions when 120 degree of timeliness of the aluminium lithium alloy that is obtained after extruding as shown in figure 3,
Tensile stress strain curve of the aluminium lithium alloy after extruding under 120 degree after timeliness 26 hours is as shown in Figure 4.
Embodiment 2
By the aluminium powder of mass fraction 94.85%, the zirconium powder of 4% copper powder 0.15% and 1% lithium bits be placed in ball grinder,
The stearic acid of addition 1.5% is added ten times of steel ball of powder quality as ball-milling medium, is filled with argon gas as process control agent
As protective atmosphere.The powder of aluminium lithium alloy is obtained in 12 hours of 500 turns of lower ball millings later.Above-mentioned powder is pressed in 500MPa
Cold moudling under power is warming up to 600 degrees Celsius of one hours of heat preservation under argon atmosphere later with 2 degrees/min of heating rate
Alloy block can be obtained, hot extrusion molding is then carried out with the extrusion ratio of 16:1 under 510 degree to further increase its densification
Degree.Aluminium lithium alloy powder after ball milling is in the pattern under scanning electron microscope as shown in figure 5, aluminium lithium alloy after extruding is under 120 degree
Tensile stress strain curve after timeliness 24 hours is as shown in Figure 6.
Embodiment 3
By the aluminium powder of mass fraction 94.8%, the zirconium powder of 4% copper powder 0.2% and 1% lithium bits be placed in ball grinder, add
Enter 1% stearic acid as process control agent, ten times of steel ball of powder quality is added as ball-milling medium, is filled with argon gas conduct
Protective atmosphere.The powder of aluminium lithium alloy is obtained in 4 hours of 500 turns of lower ball millings later.By above-mentioned powder under 600MPa pressure
Cold moudling is warming up to 600 degrees Celsius of one hours of heat preservation under argon atmosphere later with 2 degrees/min of heating rate
Alloy block is obtained, hot extrusion molding is then carried out to further increase its consistency with the extrusion ratio of 16:1 under 510 degree.It squeezes
Tensile stress strain curve of the aluminium lithium alloy under 175 degree after timeliness 8 hours after pressure is as shown in Figure 7.
Claims (8)
1. a kind of method for preparing aluminium lithium alloy；Its feature includes following procedure:
1) according to quality proportioning (94-95): (3.5-4.5): 1 chooses aluminium powder, copper powder and lithium bits；
2) aluminium powder, copper powder and lithium bits and suitable process control agent are placed in ball grinder under protectiveness atmosphere, are added certain
The abrading-ball of amount carries out ball milling under protectiveness atmosphere later, obtains the powder of aluminium lithium alloy.
3) molding of aluminium lithium alloy
High temperature sintering is carried out aluminium lithium alloy powder cold moudling made from step 2) and under argon atmosphere, sintering temperature is
520-600 degrees Celsius, hot extrusion is carried out later, and extrusion temperature is 400-520 degrees Celsius, and corresponding aluminium lithium can be obtained and close
Gold.
2. the method according to claim 1, wherein the mass fraction that process control agent is added is alloy in 2)
The 0.5%-1% of powder total weight.
3. the method according to claim 1, wherein aluminium powder, copper powder and lithium are considered to be worth doing under protectiveness atmosphere in 2)
And the element and suitable process control agent of other microalloyings including one of Mg, Ag, Zn and Zr or a variety of
It is placed in ball grinder.
4. the method according to claim 1, wherein ratio of grinding media to material is between 5-30 in 2).
5. the method according to claim 1, wherein in 2), rotational speed of ball-mill 300-600rpm, Ball-milling Time is
4-48 hours.
6. the method according to claim 1, wherein in 2), Ball-milling Time 8h, rotational speed of ball-mill 500rpm.
7. the method according to claim 1, wherein in 3), by obtained aluminium lithium alloy powder cold moudling
Pressure be 300-800MPa, extrusion ratio 16:1-25:1.
8. the method according to claim 1, wherein sintering temperature is selected as 600 degrees Celsius, hot extrusion in 3)
Temperature is 520 degrees Celsius.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910723329.3A CN110453123A (en) | 2019-08-06 | 2019-08-06 | The method for preparing aluminium lithium alloy |
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| CN201910723329.3A CN110453123A (en) | 2019-08-06 | 2019-08-06 | The method for preparing aluminium lithium alloy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112453403A (en) * | 2020-11-13 | 2021-03-09 | 北京科技大学 | Preparation method of low-cost powder metallurgy aluminum lithium alloy |
| CN112626365A (en) * | 2020-11-13 | 2021-04-09 | 北京科技大学 | Preparation method of light high-strength powder metallurgy aluminum-lithium alloy |
Citations (5)
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|---|---|---|---|---|
| US3740210A (en) * | 1971-07-06 | 1973-06-19 | Int Nickel Co | Mechanically alloyed aluminum aluminum oxide |
| US4594222A (en) * | 1982-03-10 | 1986-06-10 | Inco Alloys International, Inc. | Dispersion strengthened low density MA-Al |
| JPS62270742A (en) * | 1986-05-16 | 1987-11-25 | Sumitomo Electric Ind Ltd | Aluminum alloy and its production |
| CN104762518A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠南自仪表有限公司 | Fly ash aluminium-based composite material with good thermal conductivity and preparation method thereof |
| CN110172622A (en) * | 2019-05-17 | 2019-08-27 | 江苏豪然喷射成形合金有限公司 | A kind of lightweight injection shapes preparation and the heat-treatment technology method of 1420 aluminium lithium alloys |
-
2019
- 2019-08-06 CN CN201910723329.3A patent/CN110453123A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3740210A (en) * | 1971-07-06 | 1973-06-19 | Int Nickel Co | Mechanically alloyed aluminum aluminum oxide |
| US4594222A (en) * | 1982-03-10 | 1986-06-10 | Inco Alloys International, Inc. | Dispersion strengthened low density MA-Al |
| JPS62270742A (en) * | 1986-05-16 | 1987-11-25 | Sumitomo Electric Ind Ltd | Aluminum alloy and its production |
| CN104762518A (en) * | 2015-03-23 | 2015-07-08 | 蚌埠南自仪表有限公司 | Fly ash aluminium-based composite material with good thermal conductivity and preparation method thereof |
| CN110172622A (en) * | 2019-05-17 | 2019-08-27 | 江苏豪然喷射成形合金有限公司 | A kind of lightweight injection shapes preparation and the heat-treatment technology method of 1420 aluminium lithium alloys |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112453403A (en) * | 2020-11-13 | 2021-03-09 | 北京科技大学 | Preparation method of low-cost powder metallurgy aluminum lithium alloy |
| CN112626365A (en) * | 2020-11-13 | 2021-04-09 | 北京科技大学 | Preparation method of light high-strength powder metallurgy aluminum-lithium alloy |
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Application publication date: 20191115 |