形变对Fe－30Mn－6Si基合金形状记忆效应的影响及其机理研究  

THE INFLUENCE OF DEFORMATION ON THE SHAPE MEMORY CHARACTERISTICS OF Fe-30Mn-6Si BASED ALLOYS AND ITS MECHANISM

作　　者：刘冠威[1] 夏瑞东[1] 曲士昱 刘涛[1] 李映雪[1] 

机构地区：[1]北京科技大学材料物理系,北京钢铁研究总院

出　　处：《功能材料与器件学报》1996年第2期83-89,共7页Journal of Functional Materials and Devices

基　　金：国家自然科学基金

摘　　要：本文用膨胀法比较了Ｆｅ－３０Ｍｎ－６Ｓｉ合金在拉伸应变下纵向（沿拉伸方向）和横向（垂直拉伸方向）恢复率的不同；研究了预应变对纵向恢复量，恢复率以及Ａ_ｓ，Ａ_ｆ的影响；还用一个大应变量下的样品在Ａ_ｓ和Ａ_ｆ范围内的不同温度区间进行了加热和冷却循环试验，得到了一些很有意义的信息。用正电子湮灭方法研究了Ｆｅ－３０ＭＤ－６Ｓｉ，Ｆｅ－３０Ｍｎ－６Ｓｉ－５Ｃｒ合金时效和非时效样品拉伸预应变量对合金中缺陷量，缺陷密度，γ→ε相变量等的影响。The dilatometric method has been used to compare the difference of the longitudinal (parallel to tensile direction) and transverse(vertical to tensile direction)recovery rate of Fe-30Mn-6Si-5Cr alloy in this paper.The effect of prestrain on longitudinal recovery quantity, recovery rate,A_s and A_f has been studied.The recovery rate affected by thermal cycling following prestrain has been studied.At same time, some significant information was obtained by repeated heating and cooing a large prestrain specimen in different temperature range between A_s and A_f.Moreover, the influence of tensile prestrain on the amount of defects, the alloy density at defects and the amount of γ→ε transformation has been examined by using positron annihilation technique in aging and nonaging Fe-30Mn-6Si and Fe30Mn-6Si-5Cr alloys.

关 键 词：形状记忆合金 形变 相变 

分 类 号：TG139.6[一般工业技术—材料科学与工程]