Martensitic transformation and magnetic properties of Ti-doped NiCoMnSn shape memory alloy  

作　　者：Feng Chen Yun-Xiang Tong Bing Tian Li Li Yu-Feng Zheng 

机构地区：[1]Center for Biomedical Materials and Engineering, Harbin Engineering University [2]Department of Materials Science and Engineering, College of Engineering, Peking University

出　　处：《Rare Metals》2014年第5期511-515,共5页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51101040 and 51201044);the Scientific Research Fund of Heilongjiang Provincial Education Department (No. 12513046)

摘　　要：Martensitic transformation, microstructure, and magnetic properties of Ti-doped Ni43-xTixCo7Mn43Sn7（at%）（x = 0, 0.5, 1.0, 2.0, and 4.0） shape memory alloys were investigated. The results show that transformation temperatures of Ni43Co7Mn43Sn7 can be efficiently adjusted by the substitution of Ti for Ni. For example, the martensitic transformation starting temperature（Ms） is reduced by about 278 K with 4 at% addition of Ti. Room temperature microstructure evolves from single tetragonal martensite for the Ti-free alloy to dual phases（tetragonal martensite ＋ second phase） with 0.5 at%, 1.0 at%, and2.0 at% addition of Ti to dual phases（cubic austenite ＋ second phase） for 4.0 at% Ti-doped alloy. The mechanical properties can be obviously improved by adding an appropriate amount of Ti. A noteworthy point is that magnetic-field-induced reverse transformation is observed in Ni39Ti4Co7Mn43Sn7 alloy.Martensitic transformation, microstructure, and magnetic properties of Ti-doped Ni43-xTixCo7Mn43Sn7（at%）（x = 0, 0.5, 1.0, 2.0, and 4.0） shape memory alloys were investigated. The results show that transformation temperatures of Ni43Co7Mn43Sn7 can be efficiently adjusted by the substitution of Ti for Ni. For example, the martensitic transformation starting temperature（Ms） is reduced by about 278 K with 4 at% addition of Ti. Room temperature microstructure evolves from single tetragonal martensite for the Ti-free alloy to dual phases（tetragonal martensite ＋ second phase） with 0.5 at%, 1.0 at%, and2.0 at% addition of Ti to dual phases（cubic austenite ＋ second phase） for 4.0 at% Ti-doped alloy. The mechanical properties can be obviously improved by adding an appropriate amount of Ti. A noteworthy point is that magnetic-field-induced reverse transformation is observed in Ni39Ti4Co7Mn43Sn7 alloy.

关 键 词：NiCoMnSn Shape memory alloy Martensitic transformation Magnetic property 

分 类 号：TG139.6[一般工业技术—材料科学与工程] TQ426.65[金属学及工艺—合金]