Defect structure and martensitic transformation crystallography in Ni2MnGa alloy
Ferromagnetic shape memory alloys can produce large strains in a magnetic field by twin boundary motion. The mobility of parent-martensite inter-phase interfaces and twin-twin inter-variant boundaries is closely related to their interfacial structures and the mechanism of migration, therefore a thorough understanding of its nature is of importance. A physical model of the structure of parent-martensite interface has been developed recently based on dislocation theories and topological arguments. On the basis of the topological model, the present work performs a theoretical study of the defect structure of the martensitic interface, and the transformation crystallography in Ni2MnGa alloy. The habit plane, i.e., the parent-martensite interface plane was determined to be (-0.761, -0.054, -0.646)P for the parent crystal index frame, and (-0.818, 0.067, -0.571)M for the martensite frame. The habit plane inclination angle is 5.945° and 5.953° with respect to the terrace plane in the parent and martensite crystals, respectively.
Defect structure martensitic interface transformation crystallography Ni2MnGa alloy
Zhaozhao Wei Xiao Ma Xin-Ping Zhang
School of Materials Science and Engineering, South China University of Technology,Guangzhou 510640, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640,
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
463-466
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）