Martensitic Transformation and Superelasticity in Fe–Mn–Al-Based Shape Memory Alloys

被引：37
作者：
Omori T. [1 ]
Kainuma R. [1 ]
机构：
[1] Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-02, Sendai
来源：
Shape Memory and Superelasticity | 2017年 / 3卷 / 04期
基金：
日本学术振兴会;
关键词：
Abnormal grain growth; Entropy of transformation; Equilibrium temperature; Ferrous shape memory alloy; Fe–Mn–Al–Ni; Nanoprecipitation; Thermoelastic;
D O I：
10.1007/s40830-017-0129-9
中图分类号：
学科分类号：
摘要：
Ferrous shape memory alloys showing superelasticity have recently been obtained in two alloy systems in the 2010s. One is Fe–Mn–Al–Ni, which undergoes martensitic transformation (MT) between the α (bcc) parent and γ′ (fcc) martensite phases. This MT can be thermodynamically understood by considering the magnetic contribution to the Gibbs energy, and the β-NiAl (B2) nanoprecipitates play an important role in the thermoelastic MT. The temperature dependence of critical stress for the MT is very small (about 0.5 MPa/°C) due to the small entropy difference between the parent and martensite phases in the Fe–Mn–Al–Ni alloy, and consequently, superelasticity can be obtained in a wide temperature range from cryogenic temperature to about 200 °C. Microstructural control is of great importance for obtaining superelasticity, and the relative grain size is among the most crucial factors. © 2017, ASM International.
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页码：322 / 334
页数：12
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