Determination of the orientation relationship between austenite and 5M modulated martensite in Ni-Mn-Ga alloys

The microstructural and crystallographic characteristics of 5M martensite in an Ni50Mn28Ga22 alloy were investigated by electron backscatter diffraction (EBSD) analysis. The microstructure of 5M martensite observed at room temperature can be characterized by broad plates with alternately distributed...

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Bibliographic Details
Published in:Journal of applied crystallography 2011-12, Vol.44 (6), p.1222-1226
Main Authors: Li, Zongbin, Zhang, Yudong, Esling, Claude, Zhao, Xiang, Zuo, Liang
Format: Article
Language:English
Subjects:
Alloys
Crystallography
Diffraction
Electron back scatter diffraction
electron backscatter diffraction
ferromagnetic shape memory alloys
Martensite
martensitic transformation
Microstructure
Orientation
orientation relationship
Orientation relationships
Scattering
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Summary:The microstructural and crystallographic characteristics of 5M martensite in an Ni50Mn28Ga22 alloy were investigated by electron backscatter diffraction (EBSD) analysis. The microstructure of 5M martensite observed at room temperature can be characterized by broad plates with alternately distributed fine lamellae (variants). With the accurate EBSD orientation measurements and by application of monoclinic superstructure information, four twin‐related variants in one broad plate were identified. On the basis of the correct orientation data of martensite variants acquired from the EBSD measurements, the more favourable orientation relationship between austenite and 5M martensite was revealed to be the Pitsch relation with (101)A//()5M and []A//[]5M by detailed crystallographic calculation without residual austenite.
ISSN:1600-5767
0021-8898
1600-5767
DOI:10.1107/S0021889811043366