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Preparation method of 7XXX aluminum alloy blank ingot

A technology of aluminum alloy and aluminum alloy powder, which is applied in metal processing equipment, transportation and packaging, etc., and can solve problems such as broken, difficult to press and form, and easy to drop powder on the surface of the compact

Active Publication Date: 2019-04-16
宁波合盛新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the solid solution strengthening of 7XXX aluminum alloy powder in the process of atomization powder making, the strength and hardness of 7XXX alloy powder are significantly higher than that of elemental powder, so it is difficult to press and form 7XXX aluminum alloy powder in the process of powder cold pressing , the surface of the compact is easy to lose powder and break

Method used

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preparation example Construction

[0025] The invention provides a method for preparing a 7XXX aluminum alloy billet, including the following steps:

[0026] Vacuum annealing the 7XXX aluminum alloy powder to obtain annealed aluminum alloy powder; the vacuum degree of the vacuum annealing is ≤0.1Pa, the temperature is 200-400°C, and the holding time is 1-3h;

[0027] Subjecting the annealed aluminum alloy powder to cold isostatic pressing to obtain a compact;

[0028] The compact is subjected to vacuum pressureless sintering to obtain a 7XXX aluminum alloy billet.

[0029] In the present invention, the 7XXX aluminum alloy powder is subjected to vacuum annealing to obtain annealed aluminum alloy powder. In the present invention, the vacuum degree of the vacuum annealing is less than or equal to 0.1 Pa; the temperature is 200-400°C, preferably 260-360°C; and the holding time is 1 to 4 hours, preferably 2 to 3 hours. In the present invention, the vacuum annealing is preferably performed in a vacuum tube furnace.

[0030] ...

Embodiment 1

[0039] Weigh 60g of 7055 aluminum alloy powder with a D50 of 20μm and put it into a vacuum tube furnace for vacuum annealing, and then cool the furnace to obtain annealed aluminum alloy powder; where the furnace vacuum is ≤0.1Pa, the vacuum annealing temperature is 360℃, and the holding time is 4h;

[0040] Put the annealed aluminum alloy powder into a rubber sheath of Φ25, vibrate the annealed aluminum alloy powder by a vibrator, cover it with a rubber cover and seal it, and put it into a cold isostatic press for cold isostatic pressing. Obtain the compact with a relative density of 85%; among them, the pressure of cold isostatic pressing is 180MPa, and the pressure holding time is 120s;

[0041] Put the compact into a vacuum tube furnace for vacuum pressureless sintering, which specifically includes: under the condition of vacuum ≤0.01Pa, heating from room temperature to 380°C at a heating rate of 5°C / min, and holding for 50 minutes; Under the condition of temperature ≤0.01Pa, t...

Embodiment 2

[0043] Weigh 7kg of 7055 aluminum alloy powder with a D50 of 20μm and put it into a vacuum tube furnace for vacuum annealing, and then cool down with the furnace to obtain annealed aluminum alloy powder; where the furnace vacuum is ≤0.1Pa, the vacuum annealing temperature is 300℃, and the holding time is 2h;

[0044] Put the annealed aluminum alloy powder into a rubber sheath of Φ100, vibrate the annealed aluminum alloy powder by a vibrator, cover it with a rubber cover and seal it and put it into a cold isostatic press for cold isostatic pressing. Obtain the compact with a relative density of 92%; among them, the pressure of cold isostatic pressing is 200MPa, and the pressure holding time is 120s;

[0045] Put the compact into a vacuum tube furnace for vacuum pressureless sintering, which specifically includes: under the condition of vacuum ≤0.01Pa, heating from room temperature to 320°C at a heating rate of 5°C / min, and holding for 100 minutes; Under the condition of temperature...

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Abstract

The invention relates to the technical field of metal materials, in particular to a preparation method of a 7XXX aluminum alloy blank ingot. According to the preparation method, the strength and hardness of 7XXX aluminum alloy powder can be reduced by vacuum annealing, the problem that the follow-up pressing forming of the 7XXX aluminum alloy powder is difficult is solved, and the density of the pressed-molded pressed blank reaches the requirements of the sintering process. Meanwhile, the pressed blank is subjected to vacuum pressureless sintering, the relative density of the obtained blank ingot is 98.0% or above, the alloy element can be flexibly controlled, and the volatilization amount of Zn in the blank ingot is less than 1 wt%; and the content of Zn can be added according to design requirements, component segregation cannot occur, the yield of the blank is high, the product performance is stable, and the problems that the low sintering density and Zn element easy volatilization and the like of the 7XXX aluminum alloy blank ingot prepared by mixing the simple substance powder and the intermediate alloy powder are solved. In addition, the preparation method is short in technological process, simple in production equipment and convenient for large-scale production.

Description

Technical field [0001] The invention relates to the technical field of metal materials, in particular to a method for preparing a 7XXX aluminum alloy billet. Background technique [0002] The 7XXX aluminum alloy is mainly composed of Al-Zn-Mg-Cu, in which the Zn content can reach up to 15wt%, and it is found that increasing the Zn content in the development of aluminum alloy products can significantly improve the mechanical properties of the 7XXX aluminum alloy. [0003] At present, the preparation method of 7XXX aluminum alloy is mainly the melting and casting method, including batching, melting, slagging, alloying, casting and heat treatment. However, the 7XXX aluminum alloy prepared by this method has poor casting performance, because the increase in the content of Zn, Mg, Cu and other alloy elements during the casting process will cause the crystallization range of the 7XXX aluminum alloy to widen, and the molten metal is likely to form coarse dendrites during the solidificatio...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C21/10B22F1/00B22F3/16
CPCC22C1/0416C22C21/10B22F3/16B22F2998/10B22F2999/00B22F1/14B22F3/1007B22F2201/20B22F1/142B22F3/04
Inventor 不公告发明人
Owner 宁波合盛新材料有限公司