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New approach to twin interfaces of modulated martensite
Author(s) -
Li Zongbin,
Zhang Yudong,
Esling Claude,
Zhao Xiang,
Wang Yandong,
Zuo Liang
Publication year - 2010
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s002188981000868x
Subject(s) - martensite , superstructure , crystallography , materials science , electron backscatter diffraction , shape memory alloy , transmission electron microscopy , diffraction , ferromagnetism , electron diffraction , crystal structure , alloy , condensed matter physics , magnetic shape memory alloy , nanotechnology , metallurgy , chemistry , optics , magnetic field , magnetic anisotropy , microstructure , physics , thermodynamics , magnetization , quantum mechanics
In Ni–Mn–Ga ferromagnetic shape memory alloys, the crystallographic nature of martensitic variant interfaces is one of the key factors governing the variant reorientation through field‐induced interface motion and hence the shape memory performance. So far, the crystal structure studies of these materials – conducted by means of transmission electron microscopy – have suffered from uncertainties in determining the number of unit cells of modulated superstructure, and consequently improper interpretations of orientation correlations of martensitic variants. In this paper a new approach is presented for comprehensive analysis of crystallographic and morphological information of modulated martensite, using automated electron backscatter diffraction. As a first attempt, it has been applied for the unambiguous determination of the orientation relationships of adjacent martensitic variants and their twin interface characters in an incommensurate 7M modulated Ni–Mn–Ga alloy, from which a clear and full‐featured image of the crystallographic nature of constituent twin interfaces is built up. Certainly, this new approach will make it feasible not only to generalize the statistical analysis of martensitic variant distributions for various materials with modulated superstructure, but also to give insight into the crystallographic characteristics of martensitic variant interfaces and the variant reorientation mechanism of new advanced materials for interface engineering.