Martensitic transformation and shape memory effect under magnetic field for Ni2MnGa sputtered films containing iron
Martensitic transformation and shape memory effect under magnetic field for Ni2MnGa sputtered films containing iron
复制标题
DOI：
10.1016/j.msea.2006.11.187
复制
发表时间：
2008-05
期刊：
影响因子：
6.4
通讯作者：
M. Ohtsuka;H. Katsuyama;M. Matsumoto;T. Takagi;K. Itagaki
中科院分区：
文献类型：
--
作者：
M. Ohtsuka;H. Katsuyama;M. Matsumoto;T. Takagi;K. Itagaki
研究了添加铁元素对Ni2MnGa溅射薄膜的马氏体相变(MT)和形状记忆效应(SME)的影响。结果表明，Fe含量大于8.5mol%的强制时效薄膜有两种相结构。随着铁加入量的增加，MT温度单调下降，居里温度上升。所有含铁的约束时效薄膜都通过MT及其回复证实了热变化的可逆双向SME。此外，对于铁磁区内发生MT的含铁薄膜，在冷却时的MT温度附近观察到磁场的SME。含铁薄膜在1T的低磁场下应变变化较大。从低磁场诱导的MT来看，这一行为与预期的一致。
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 8.5mol% 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 MT temperature on cooling for the films containing iron in which MT occurred within the ferromagnetic region. The strain change in a low magnetic field of 1T became large for the films containing iron. The behavior is as expected from the MT induced by the low magnetic field.