Martensitic Transformation and Superelasticity in Fe?Mn?Al-Based Shape Memory Alloys
Martensitic Transformation and Superelasticity in Fe?Mn?Al-Based Shape Memory Alloys
复制标题
Fe?Mn?Al基形状记忆合金的马氏体相变和超弹性
DOI：
10.1007/s40830-017-0129-9
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发表时间：
2017
影响因子：
2.2
通讯作者：
Kainuma Ryosuke
中科院分区：
文献类型：
--
作者：
Omori Toshihiro;Kainuma Ryosuke
最近在 2010 年代在两种合金体系中获得了表现出超弹性的铁基形状记忆合金。一种是 Fe-Mn-Al-Ni，它在 α (bcc) 母体相和 γ′ (fcc) 马氏体相之间发生马氏体相变 (MT)。通过考虑磁性对吉布斯能量的贡献，可以从热力学角度理解这种 MT，并且 β-NiAl (B2) 纳米沉淀物在热弹性 MT 中发挥着重要作用。由于Fe-Mn-Al-Ni合金中母相和马氏体相之间的熵差很小，MT的临界应力的温度依赖性非常小（约0.5MPa/°C），因此，可以在从低温到约200°C的宽温度范围内获得超弹性。微观结构控制对于获得超弹性非常重要，而相对晶粒尺寸是最关键的因素之一。
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.