Degeneration and rejuvenation of shape memory effect associated with the precipitation of coherent nano-particles in a Co-Ni-Si shape memory alloy  

作　　者：Huabei Peng Dian Wang Qi Liao Yuhua Wen 

机构地区：[1]School of Mechanical Engineering,Sichuan University,Chengdu 610065,China

出　　处：《Journal of Materials Science & Technology》2021年第17期150-155,共6页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(Nos.51671138 and 51971152)。

摘　　要：In a solution treated Co-20Ni-6Si shape memory alloy,coherent nano-particles were precipitated after annealing at 873 K for 1 min,but the shape memory effect almost vanished.It is attributed to that the coherent nano-particles not only suppressed the stress-induced face-centered cubic to close-packed hexagonal martensite transformation but also damaged the crystallographic reversibility of reverse martensite transformation.After further annealing at 1073 K for 1 min,the shape memory effect was rejuvenated owing to the dissolution of nano-particles.Besides,the recovery strain significantly increased to5.1%from the solution treatment of 3.1%after annealing at 1073 K for 1 min.

关 键 词：Shape memory alloys Martensitic phase transformation Defects Coherent nano-particles 

分 类 号：TG139.6[一般工业技术—材料科学与工程]