HIGH-STRENGTH AND HIGH-TOUGHNESS COPPER-ZINC-ALUMINUM SHAPE MEMORY ALLOY AND PREPARATION METHOD THEREFOR

WIPO Patent Application WO/2021/129802

A1

A high-strength and high-toughness copper-zinc-aluminum shape memory alloy and a preparation method therefor. According to the preparation method, grains of an alloy are further refined by performing smelting and cryogenic treatment twice, and the copper-zinc-aluminum shape memory alloy obtains better toughness and plasticity by means of the cooperation of other preparation processes, thereby improving the cold and hot fatigue properties of the alloy. A Cu-10RE intermediate alloy is a refiner, which, on the one hand, can react with harmful impurities due to the addition of composite rare earth elements so as to produce a high melting point product that can emerge from the surface of a solution during standing, and on the one hand, can react with other alloy elements to produce intergranular products. The intergranular products play a role of heterogeneous nucleation in the initial stage of alloy solidification, and mechanically hinders the growth of grains in the later stage of solidification, thereby facilitating grain refining, and improving the cold and hot fatigue properties of the alloy.

LIU GUANGLEI (CN)
LI SHAOMING (CN)
WAN HAO (CN)
SI NAICHAO (CN)
LI SHOUXIANG (CN)
SUN ZHONGGUO (CN)

PCT/CN2020/139375

July 01, 2021

December 25, 2020

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NANJING LONGHAO NEW MATERIAL TECH CO LTD (CN)

C22C9/01; C22C1/03; C22F1/08

CN110951989A	2020-04-03
CN101050493A	2007-10-10
CN101717903A	2010-06-02
CN1969050A	2007-05-23
CN107326215A	2017-11-07
CN101033516A	2007-09-12
JPH1158034A	1999-03-02
JPH111736A	1999-01-06

BEIJING GAOWO LAW FIRM (CN)

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