【作者】 蔡伟； 高智勇； 陈枫； 王中； 赵连城； 吴光恒； 沈保根； 詹文山；

【Author】 CAI Wei;GAO Zhi-yong;CHEN Feng;WANG Zhong;ZHAO Lian-cheng;WU Guang-heng;SHENG Bao-geng;ZHAN Wen-shan School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China; Institute of Physics, Chinese Academy of Science, Beijing, 100080, China

【机构】 哈尔滨工业大学材料科学与工程学院； 中国科学院物理研究所磁学实验室；

【摘要】 本文采用X射线衍射分析、透射电镜现察以及压缩试验研究了Ni₅₃Mn₂₃Ga₂₄ 磁性形状记忆合金热致马氏体相变及其应变恢复特性。研究结果表明,热致马氏体为体心正交结构的7M板条马氏体,点阵常数为a=0.624nm,b=0.591nm,c=0.562nm,合金的热致马氏体变体构成典型的自协作组态。每个马氏体变体内部都是由平行排列的细板条状亚组织构成,单一马氏体变体的内部亚结构为孪晶。预变形量对应变恢复特性有明显的影响。当预应变量小于6%时,应变恢复率达到100%;当预应变量超过6%后,随着预应变量的增加,应变恢复率下降。更多还原

【Abstract】 In Present paper, thremally-induced martensite and its strain recovery characteristics have been investigatedby XRD, TEM and compression experiment. It showed that the thermally-induced martensite has self-accommodatedmorphology, and its substructure is twin. When the pre-strain is smaller than 6%, the strain is perfectly recovered whenheating to above A_f. However, the strain recovery ratio decreased with the pre-strain increasing when the amount ofpre-strain is over 6%.更多还原