1. Growth and characterization of ferromagnetic shape memory alloy Co50Ni20FeGa29 single crystals
- Author
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Dai, X.F., Wang, H.Y., Chen, L.J., Duan, X.F., Chen, J.L., Wu, G.H., Zhu, Hao, and Xiao, John Q.
- Subjects
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SHAPE memory alloys , *METALLIC composites , *CRYSTALLOGRAPHY , *CRYSTALS - Abstract
Abstract: Single crystals of Co50Ni20FeGa29 with B2 phase have been obtained in a deep supercooling condition. The interface-facets and the segregation effect lead to the formation of ordered defects that store a directional internal stress. These defects give to a large energy barrier that leads to a very sharp martensitic transformation within a temperature window of only 2K. The single crystals show good shape memory effect and superelasticity, which are anisotropic between the growth direction [001] and its equivalent direction [010]. The anisotropic behaviors are attributed to the directional internal stress caused by the ordered defects. [Copyright &y& Elsevier]
- Published
- 2006
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