Crystal structures and textures in the hot-forged Ni-Mn-Ga shape memory alloys

Cong, D. Y., Wang, Y. D., Peng, R. Lin, Zetterstrom, P., Zhao, X., Liaw, P. K. and Zuo, L. 2006, Crystal structures and textures in the hot-forged Ni-Mn-Ga shape memory alloys, Metallurgical and materials transactions A, vol. 37, no. 5, pp. 1397-1403, doi: 10.1007/s11661-006-0084-0.

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Title Crystal structures and textures in the hot-forged Ni-Mn-Ga shape memory alloys
Author(s) Cong, D. Y.
Wang, Y. D.
Peng, R. Lin
Zetterstrom, P.
Zhao, X.
Liaw, P. K.
Zuo, L.
Journal name Metallurgical and materials transactions A
Volume number 37
Issue number 5
Start page 1397
End page 1403
Total pages 7
Publisher Springer New York LLC
Place of publication New York, N. Y.
Publication date 2006-05
ISSN 1073-5623
Keyword(s) anisotropy
crystal structure
ferromagnetic materials
plastic flow
polycrystalline materials
shape memory effect
Summary Three ferromagnetic shape-memory alloys with the chemical compositions of Ni53Mn25Ga22, Ni48Mn30Ga22, and Ni48Mn25Ga22Co5 were prepared by the induction-melting and hot-forging process. The crystal structures were investigated by the neutron powder diffraction technique, showing that Ni53Mn25Ga22 and Ni48Mn25Ga22Co5 have a tetragonal, 14/mmm martensitic structure at room temperature, while Ni48Mn30Ga22 has a cubic, L21 austenitic structure at room temperature. The development of textures in the hot-forged samples shows the in-plane plastic flow anisotropy from the measured pole figures by means of the neutron diffraction technique. Significant texture changes were observed for the Ni48Mn25Ga22Co5 alloy after room temperature deformation, which is due to the deformation-induced rearrangements of martensitic variants. An excellent shape-memory effect (SME) with a recovery ratio of 74 pct was reported in this Ni48Mn25Ga22Co5 polycrystalline alloy after annealing above the martensitic transformation temperature, and the “shape-memory” influence also occurs in the distributions of grain orientations.
Language eng
DOI 10.1007/s11661-006-0084-0
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
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