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Structure and phase stability of NiMnGa ferromagnetic shape memory alloys by experimental and ab-initio techniques

Esling, C., Cong, D. Y., Bai, J., Zhang, Y. D., Raulot, J. M., Zhao, X. and Zuo, L. 2010, Structure and phase stability of NiMnGa ferromagnetic shape memory alloys by experimental and ab-initio techniques, Materials science forum, vol. 638-642, pp. 2040-2045.

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Title Structure and phase stability of NiMnGa ferromagnetic shape memory alloys by experimental and ab-initio techniques
Author(s) Esling, C.
Cong, D. Y.
Bai, J.
Zhang, Y. D.
Raulot, J. M.
Zhao, X.
Zuo, L.
Journal name Materials science forum
Volume number 638-642
Start page 2040
End page 2045
Total pages 6
Publisher Trans Tech Publications
Place of publication Stafa-Zurich, Switzerland
Publication date 2010
ISSN 0255-5476
Keyword(s) ab initio calculations
crystal structure
ferromagnetic shape memory alloys (FSMAs)
orientation relationship
phase transformation
Summary This paper summarizes some of our recent results on crystal structure, microstructure, orientation relationship between martensitic variants and crystallographic features of martensitic transformation in Ni-Mn-Ga FSMAs. It was shown that Ni53Mn25Ga22 has a tetragonal I4/mmm martensitic structure at room temperature. The neighboring martensitic variants in Ni53Mn25Ga22 have a compound twinning relationship with the twinning elements K1={112}, K2={11-2}, η1=<11-1>, η2=<111>, P={1-10} and s=0.379. The ratio of the relative amounts of twins within the same initial austenite grain is ~1.70. The main orientation relationship between austenite and martensite is Kurdjumov-Sachs (K-S) relationship. Based on the crystallographic phenomenological theory, the calculated habit plane is {0.690 -0.102 0.716}A (5.95° from {101}A), and the magnitude, direction and shear angle of the macroscopic transformation shear are 0.121, <-0.709 0.105 0.698>A (6.04° from <-101>A) and 6.88°, respectively.
Language eng
Field of Research 091205 Functional Materials
Socio Economic Objective 861299 Fabricated Metal Products not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2010, Trans Tech Publications
Persistent URL http://hdl.handle.net/10536/DRO/DU:30049004

Document type: Journal Article
Collection: Institute for Frontier Materials
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