Paper Title:
Defect Structure and Martensitic Transformation Crystallography in Ni2MnGa Alloy
  Abstract

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.

  Info
Periodical
Edited by
Chengming Li, Chengbao Jiang, Zhiyong Zhong and Yichun Zhou
Pages
463-466
DOI
10.4028/www.scientific.net/MSF.687.463
Citation
Z. Z. Wei, X. Ma, X. P. Zhang, "Defect Structure and Martensitic Transformation Crystallography in Ni2MnGa Alloy", Materials Science Forum, Vol. 687, pp. 463-466, 2011
Online since
June 2011
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