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Crystal structures and textures of hot forged Ni48Mn30Ga22 alloy investigated by neutron diffraction technique

Cong, D. Y., Wang, Y. D., Zetterstrom, P., Peng, R. L., Delaplane, R., Zhao, X. and Zuo, L. 2005, Crystal structures and textures of hot forged Ni48Mn30Ga22 alloy investigated by neutron diffraction technique, Materials science and technology, vol. 21, no. 12, pp. 1412-1416.

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Title Crystal structures and textures of hot forged Ni48Mn30Ga22 alloy investigated by neutron diffraction technique
Author(s) Cong, D. Y.
Wang, Y. D.
Zetterstrom, P.
Peng, R. L.
Delaplane, R.
Zhao, X.
Zuo, L.
Journal name Materials science and technology
Volume number 21
Issue number 12
Start page 1412
End page 1416
Total pages 5
Publisher Maney Publishing
Place of publication West Yorks, England
Publication date 2005-12
ISSN 0267-0836
1743-2847
Keyword(s) crystal structure
hot forging
neutron diffraction
Ni-Mn-Ga shape memory alloy
texture
Summary A ferromagnetic shape memory alloy of Ni48Mn30Ga22 prepared by induction melting was successfully hot forged. Strong textures and a large anisotropy of in plane plastic flow were developed during the hot forging process. The crystal structures, both in austenitic and martensitic states, were investigated by means of neutron powder diffraction technique. The result suggests that Ni48Mn30Ga22 has a cubic L21 Heusler structure at room temperature, the same as that in the stoichiometric Ni2MnGa. When cooled to 243 K, the Ni48Mn30Ga22 alloy changes into a seven layered orthorhombic martensitic structure. No substantial change of the neutron diffraction pattern was observed upon further cooling to 19 K, indicating that there is no intermartensitic transformation in the investigated alloy, which is different from the transformation processes in the Ni–Mn–Ga alloys with higher martensitic transformation temperatures.
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
Persistent URL http://hdl.handle.net/10536/DRO/DU:30048234

Document type: Journal Article
Collection: Institute for Frontier Materials
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