Martensitic transformation in shape memory alloys under magnetic field and hydrostatic pressure

被引：15
作者：
Kakeshita, T
Fukuda, T
Sakamoto, T
Takeuchi, T
Kindo, K
Endo, S
Kishio, K
机构：
[1] Osaka Univ, Grad Sch Engn, Dept Mat Sci & Engn, Suita, Osaka 5650871, Japan
[2] Osaka Univ, Low Temp Ctr, Toyonaka, Osaka 5608531, Japan
[3] Osaka Univ, Res Ctr Mat & Sci Extreme Condit, Toyonaka, Osaka 5608531, Japan
[4] Univ Tokyo, Grad Sch Engn, Dept Appl Chem, Tokyo 1138656, Japan
来源：
MATERIALS TRANSACTIONS | 2002年 / 43卷 / 05期
关键词：
martensitic transformation; transformation temperature; magnetic field; hydrostatic pressure; ferromagnetic shape memory alloy; magnetic anisotropy energy; giant magnetostriction;
D O I：
10.2320/matertrans.43.887
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Effects of magnetic field and hydrostatic pressure on martensitic transformation have been examined by using Fe-Pt, Cu-Al-Ni, Ni2MnGa and Fe-Pd shape memory alloys and Fe-Ni alloys. Following results are obtained; (i) in Fe-Pt, Cu-Al-Ni and Fe-Ni alloys, the experimental magnetic field and/or hydrostatic pressure dependence of martensitic transformation start temperature, M-s, is in good agreement with the dependence calculated by the equation previously proposed by our group to evaluate the relation between M-s and magnetic field and hydrostatic pressure. (ii) Giant magnetostriction has been observed in the martensite state of Ni2MnGa and Fe-31.2 at%Pd ferromagnetic shape memory alloy single crystals. The values (contraction of 3.8% for Ni2MnGa and expansion of about 3% for Fe-31.2at%Pd) are nearly the same values as can be expected from the perfect conversion of variants, i.e., variants are converted to preferable variants whose magnetocrystalline anisotropy energy is minimum among them under the magnetic field.
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页码：887 / 892
页数：6
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