Martensitic transformation, ductility, and shape-memory effect of polycrystalline Ni56Mn25-xFexGa19 alloys

被引：41
|
作者：
Ma, YQ
Xu, LH
Li, Y
Jiang, CB
Xu, HB
Lee, YK
机构：
[1] Yonsei Univ, Dept Met Engn, Seoul 120749, South Korea
[2] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Beijing 100083, Peoples R China
来源：
ZEITSCHRIFT FUR METALLKUNDE | 2005年 / 96卷 / 08期
关键词：
NiMnGa Heusler alloy; high temperature shape-memory effect; ductility; martensitic transformation;
D O I：
10.3139/146.101110
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Buttons of high-temperature shape-memory alloy Ni56Mn25-xFexGa19 were prepared by arc melting under argon atmosphere. The specimens were hot rolled to 1 mm. plates, and their martensitic transformation behaviors, ductilities, and shape-memory effects were investigated through differential scanning calorimetry and bending tests. It was found that the brittleness of polycrystalline Ni2MnGa was ameliorated through introduction of a ductile phase by Fe addition. Ni56Mn17Fe8Ga19 alloy shows great potential as a practical high-temperature shape-memory alloy with martensitc transformation start temperature above 200 degrees C. It can bear strain of 6 % before fracture in bending tests and shows a maximum reversible strain of 3.5 %.
引用
收藏
页码：843 / 846
页数：4
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