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Preparation method of aluminum based composite material with low hot-crack tendency

An aluminum-based composite material and a tendency technology, applied in the field of composite materials, can solve the problems of high cost of rare earth metals, reduce the tendency of hot cracking, etc., and achieve the effect of narrowing the crystallization temperature range, reducing the tendency of hot cracking, and improving the strength

Inactive Publication Date: 2015-05-06
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is a traditional method of adding rare earth metals to aluminum alloys to reduce hot cracking. Due to the high cost of rare earth metals and the small amount of addition, the tendency to reduce hot cracking is limited.

Method used

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  • Preparation method of aluminum based composite material with low hot-crack tendency

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 5Kg of ZL205A alloy into a crucible and melt it. When the temperature reaches 800°C, according to TiB 2 Add K to the content of 0.2wt% of ZL205A alloy 2 TiF 6 and KBF 4 Mix salt and stir for 10 minutes. After the reaction is over, pour out the reaction product. After refining, pour it into the ingot mold at 720°C to obtain TiB with low thermal cracking tendency. 2 / ZL205A composite material, thermal cracking tendency is 15.

Embodiment 2

[0021] Put 5Kg of ZL205A alloy into a crucible and melt it. When the temperature reaches 950°C, according to TiB 2 Add K to the content of 1.5wt% of ZL205A alloy 2 TiF 6 and KBF 4 Mix salt and stir for 30 minutes. After the reaction is over, pour out the reaction product. After refining, pour it into the ingot mold at 750°C to obtain TiB with low thermal cracking tendency. 2 / ZL205A composite material, thermal cracking tendency is 12.

Embodiment 3

[0023] Put 5Kg of ZL205A alloy into a crucible and melt it. When the temperature reaches 875°C, according to TiB 2 Add K to the content of 0.8wt% of ZL205A alloy 2 TiF 6 and KBF 4 Mix salt and stir for 20 minutes. After the reaction is over, pour out the reaction product. After refining, pour it into the ingot mold at 735°C to obtain TiB with low thermal cracking tendency. 2 / ZL205A composite material, thermal cracking tendency is 13.5.

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Abstract

The invention discloses a preparation method of an aluminum based composite material with a low hot-crack tendency. The preparation method comprises the following steps: overheating a ZL205A alloy to 800-950 DEG C to obtain a ZL205A melt; and uniformly mixing a K2TiF6 salt with a KBF4 salt according to the stoichiometric ratio of TiB2, then adding the mixture into the ZL205A melt, stirring, and cooling at 720-750 DEG C for shaping to obtain a product. Compared with the prior art, the hot-crack tendency of the TiB2 / ZL205A with the low hot-crack tendency, prepared by the method disclosed by the invention, is 12-15 which is reduced by 40-50% compared with that of an existing matrix ZL205A alloy; and meanwhile, the tensile strength is improved by 15-20%. By using the preparation method, the hot-crack tendency of the composite material is significantly reduced, and the strength of the composite material is obviously improved.

Description

technical field [0001] The invention relates to a composite material used in the field of metal materials, in particular to a method for preparing an aluminum-based composite material with low thermal cracking tendency. Background technique [0002] ZL205A (Al-Cu alloy) is a cast aluminum alloy successfully developed by our country. It has high strength, toughness and excellent fatigue performance. It is widely used in aerospace, national defense, automobile industry and other fields. Due to the characteristics of the alloy itself, this type of material has a high tendency to hot cracking during the casting process. The traditional method to reduce the hot cracking tendency is to add rare earth elements to the Al-Cu matrix. Due to the high burning loss rate of rare earth metals, argon protection is often required, and the price of rare earth metals is relatively high, resulting in complex preparation processes, which is not conducive to the popularization and application of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C1/02C22C21/00
Inventor 张晓波张亦杰马乃恒王浩伟
Owner SHANGHAI JIAO TONG UNIV
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