冷变形对FeMnSiCrNi合金形状恢复率和转变温度的影响
Influence of Cold Deformation on Shape Recovery Ratio and Transformation Temperature of FeMnSiCrNi Shape Memory alloys
于学勇, 华征潇
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作者单位：常熟理工学院 机械工程系, 江苏 常熟 215500
中文关键字：形状记忆合金； 马氏体转变； 形变； 热膨胀
英文关键字：shape memory alloys; martensitic transformation; deformation; dilatometry
中文摘要：通过Fe16Mn6Si7Cr7Ni合金变形量的大小和形变的类型来研究马氏体的转变特征。形变类型及变形量为：冷轧13%～28%；拉伸4%～17%。并通过热膨胀法测量合金相转变起始温度和转变终了温度，合金的相组成和微观结构特征通过XRD、 SEM获得。研究结果表明：冷变形过程均会导致合金的形状恢复率降低，导致应力诱发ε、α/马氏体的形成，并使热马氏体的Ms低于室温。
英文摘要：The characteristics of martensitic transformation in Fe16Mn6Si7Cr7Ni alloy were investigated by the amount and type of deformation: 13% to 28% cold rolling, and 4% to 17% elongation. The starting and finishing transformation temperature of the alloys was measured by dilatometry method. The constitution and microstructure of the alloys were characterized by X-ray diffraction, scanning electron microscopy. The results show that cold forming processes decrease the shape recovery ratio and induce the formation of ε and α/ martensitic, and make the starting transformation temperature of thermal martensitic below room temperature.