MnFeCu反铁磁形状记忆合金中FCC-FCT马氏体-中国有色金属学报.PDF

25 3 2015 3 Volume 25 Number 3 The Chinese Journal of Nonferrous Metals March 2015 1004-0609(2015)-03-0720-07 MnFeCu FCC-FCT ( 200240) MnFeCu FCC-FCT MnFeCu FCC-FCT ID WLR ID MnFeCu ID FCC-FCT TG145 A Crystallography of FCC-FCT martensitic transition in MnFeCu antiferromagnetic shape memory alloy WANG Lin, CUI Yan-guang, WAN Jian-feng, ZHANG Ji-hua, RONG Yong-hua (School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China) Abstract: Shape memory effect in MnFeCu antiferromagnetic alloy comes from the FCC-FCT martensitic transformation (MT). Compared with many other alloys, MnFeCu alloys have small lattice distortion. The infinitesimal deformation (ID) approach theory was applied to study the crystallography of FCC-FCT MT with the twinning shear as the lattice invariant shear in the MnFeCu alloy. Simple analytical solutions were derived, which were in good agreement with the experiment results. Compared the calculated results with those obtained from the classical WLR theory, it was found that the former are the approximation by neglecting the higher-order terms of the latter. In the condition of small lattice distortion, they almost have the same accuracy. Therefore, for the alloys with small lattice distortion, ID approach theory can be applied to predicate the crystallography conveniently, which can derive simple analytical solutions with high accuracy. Key words: shape memory alloy; MnFeCu alloy; ID approach theory; FCC-FCT martensitic transformation; crystallography; twinning shear; lattice distortion BAIN[1]Fe-C FCC-BCT