Influence of recovery heating rate on shape memory effect in up-quenched Cu-Al-Mn alloy

作     者：王珊玲 杨琴 李小兰 彭华备 文玉华 Shan-ling WANG;Qin YANG;Xiao-lan LI;Hua-bei PENG;Yu-hua WEN

作者机构：四川大学 分析测试中心成都610065 四川大学 制造科学与工程学院成都610064 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2014年第24卷第10期

页      面：3196-3200页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：Cu-Al-Mn alloy shape memory effect martensitic phase transformation twinning 

摘      要：The effect of recovery heating rate on shape memory effect of the up-quenched Cu-8.88Al-10.27Mn（mass fraction, %） alloy was investigated by optical microscopy, electron transmission microscopy（TEM） and electrical resistivity measurement. It is found that the shape recovery rate decreases as the heating rate decreases. It can reach 75% when the heating rate is 20 ℃/min, while it is only 8% when the heating rate is 1 ℃/min. In situ microstructure observation indicates that the dependence of shape memory effect on recovery heating rate is caused by the stabilization of twinned martensite induced by deformation. The analysis of electrical resistivity shows that the stabilization of twinned martensite may be ascribed to formation of compound defects of vacancies and dislocations at the boundaries of twinned martensite during the slow heating. The compound defects prevent the reverse transformation of twinned martensite.