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Experiment and theoretical prediction of martensitic transformation crystallography in a Ni–Mn–Ga ferromagnetic shape memory alloy

Cong, D. Y., Zhang, Y. D., Wang, Y. D., Humbert, M., Zhao, X., Watanabe, T., Zuo, L. and Esling, C. 2007, Experiment and theoretical prediction of martensitic transformation crystallography in a Ni–Mn–Ga ferromagnetic shape memory alloy, Acta materialia, vol. 55, no. 14, pp. 4731-4740, doi: 10.1016/j.actamat.2007.04.045.

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Title Experiment and theoretical prediction of martensitic transformation crystallography in a Ni–Mn–Ga ferromagnetic shape memory alloy
Author(s) Cong, D. Y.
Zhang, Y. D.
Wang, Y. D.
Humbert, M.
Zhao, X.
Watanabe, T.
Zuo, L.
Esling, C.
Journal name Acta materialia
Volume number 55
Issue number 14
Start page 4731
End page 4740
Total pages 10
Publisher Elsevier BV
Place of publication Oxford, England
Publication date 2007-08
ISSN 1359-6454
1873-2453
Keyword(s) electron backscattered diffraction (EBSD)
martensitic phase transformation
microstructure
shape memory alloys (SMAs)
twin variant selection
Summary A detailed study of martensitic transformation crystallography and microstructural characteristics in the Ni53Mn25Ga22 ferromagnetic shape memory alloy (FSMA) was performed by both experimental observation and theoretical calculation. It is revealed that there are two microscopically twin-related martensitic variants with a misorientation of ∼82° around the 〈1 1 0〉M axis in each initial austenite grain. The twin interface plane was determined to be {0.399 0.383 0.833}M (1.79° away from {1 1 2}M). The ratio of the amounts of the two variants inherited from one single austenite grain is about 1.70. The prevalent orientation relationship between austenite and martensite was found to be Kurdjumov–Sachs (K–S) relationship with (1 1 1)A//(1 0 1)M, [110]A//[111]M. A successful explanation of the crystallographic features during martensitic transformation will shed light on the development of FSMAs with optimal performance.

Language eng
DOI 10.1016/j.actamat.2007.04.045
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 861299 Fabricated Metal Products not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, Acta Materialia Inc.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047720

Document type: Journal Article
Collection: Institute for Frontier Materials
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