Defect Structure and Martensitic Transformation Crystallography in Ni2MnGa Alloy

Abstract:

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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.

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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 et al., "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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$35.00

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