Martensitic transformation and shape memory effect under magnetic field for Ni2MnGa sputtered films containing iron

被引：5
|
作者：
Ohtsuka, Makoto [1 ]
Katsuyama, Hiroyuki [1 ]
Matsumoto, Minoru [2 ]
Takagi, Toshiyuki [2 ]
Itagaki, Kimio [1 ]
机构：
[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] Tohoku Univ, Inst Fluid Sci, Aoba Ku, Sendai, Miyagi 9808577, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 481卷
基金：
日本学术振兴会;
关键词：
Ni-Mn-Ga-Fe alloy; sputtered film; ferromagnetic shape memory alloy; martensitic transformation; shape memory effect; constraint-aging;
D O I：
10.1016/j.msea.2006.11.187
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of iron addition on the martensitic transformation (MT) and shape memory effect (SME) of the Ni2MnGa sputtered films was investigated. It was found that the constraint-aged films with more than 8.5 mol% Fe have two phases. MT temperatures monotonously decreased with increasing amount of iron addition, while the Curie temperature increased. The reversible two-way SME by the thermal change was confirmed for all constraint-aged films containing iron through the MT and its reversion. Furthermore, the SME by magnetic field was observed around the NIT temperature on cooling for the films containing iron in which NIT occurred within the ferromagnetic region. The strain change in a low magnetic field of 1 T became large for the films containing iron. The behavior is as expected from the MT induced by the low magnetic field. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：275 / 278
页数：4
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