Effect of Co Content on Microstructure and Mechanical Properties of High-Entropy High-Temperature Shape Memory Alloy

作     者：Zhao Yanchun Jin Bo Feng Yuanfei Ma Huwen Yu Zhiqi Feng Li Liaw Peter K 赵燕春;金博;冯远飞;马虎文;于志琦;冯力;Liaw Peter K

作者机构：State Key Laboratory of Advanced Processing and Recycling of Nonferrous MetalsLanzhou University of TechnologyLanzhou 730050China Wenzhou Pump and Valve Engineering Research Institute of Lanzhou University of TechnologyWenzhou 325105China Department of Materials Science and EngineeringUniversity of TennesseeKnoxville TN37996USA 

出 版 物：《稀有金属材料与工程》 (Rare Metal Materials and Engineering)

年 卷 期：2025年第54卷第1期

页      面：10-16页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：National Natural Science Foundation of China(12404230,52061027) Science and Technology Program Project of Gansu Province(22YF7GA155) Lanzhou Youth Science and Technology Talent Innovation Project(2023-QN-91) Zhejiang Provincial Natural Science Foundation of China(LY23E010002) 

主　　题：high-temperature shape memory alloy high-entropy alloy microstructure mechanical property 

摘      要：(TiZrHf)_(50)Ni_(30)Cu_(20-x)Co_(x)(x=2,4,6,at%)high-entropy high-temperature shape memory alloys were fabricated by watercooled copper crucible in a magnetic levitation vacuum melting furnace,and the effects of Co content on microstructure and mechanical properties were *** results indicate that the grain size of the alloy decreases with increasing the Co *** the as-cast state,the alloy consists primarily of the B19′phase,with a trace of B2 *** fracture morphology is predominantly composed of the B19′phase,whereas the B2 phase is nearly *** the Co content or reducing the sample dimensions(d)markedly enhance the compressive strength and ductility of the *** d=2 mm,the(TiZrHf)_(50)Ni_(30)Cu_(14)Co_(6) alloy demonstrates the optimal mechanical properties,achieving a compressive strength of 2142.39±1.8 MPa and a plasticity of 17.31±0.3%.The compressive cyclic test shows that with increasing the compressive strain,the residual strain of the(TiZrHf)_(50)Ni_(30)Cu_(14)Co_(6) alloy increases while the recovery ability *** superelastic recovery capability of the alloy is continuously *** superelastic recovery rate increases from 1.36%to 2.12%,the residual strain rate rises from 1.79%to 5.52%,the elastic recovery rate ascends from 3.86%to 7.36%,while the total recovery rate declines from 74.48%to 63.20%.