用X射线衍射分析、扫描电镜观察以及应变疲劳试验研究表明,Fe-Mn-Si形状记忆合金在承受正负交变应力作用时,可相应地发生应力诱发γ(←→)ε马氏体相变及其逆相变.Fe-Mn-Si形状记忆合金循环变形过程中的应力诱发γ(←→)ε马氏体相变及其逆相变能降低应力集中,抑制塑性滑移变形,减少疲劳裂纹的形成和扩展,使合金具有较高的应变疲劳强度.其弯曲疲劳断口类呈脆性断裂.Fe-17Mn-5Si-10Cr-5Ni试验合金在应变幅值为±1.5%下的应变疲劳寿命达1300次,是U71Mn轨钢和1Cr18Ni9Ti不锈钢的10倍左右.
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