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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.48  No.11 (2007)  >  pp.2847-2850

MATERIALS TRANSACTIONS
<<Previous article Vol.48  No.11 (2007)   pp.2847 - 2850 Next article>>

Control of Phase Transformation Temperatures by Substituents in Ni-Fe-Ga Ferromagnetic Shape Memory Alloys

Haruhiko Morito1), Katsunari Oikawa2), Asaya Fujita2), Kazuaki Fukamichi1), Kiyohito Ishida2) and Ryosuke Kainuma1)
1) Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
2) Department of Materials Science, Graduate School of Engineering, Tohoku University


The variations of the martensitic transformation starting temperature TMS and the Curie temperature TC in Ni-Fe-Ga alloys have been investigated by substituting with several kinds of the fourth elements. By partial substitution of Co or Cu for Ni, TC increases and TMS decreases. In particular, the increase of TC is remarkable in the Ni54−xCoxFe19Ga27 alloy, which is related to the strong Ni-Co and Co-Fe exchange interactions. For the Ni54Fe19−xMnxGa27 alloys, TC slightly increases with the increase of Mn content, in analogy with the Ni52FexMn21−xGa27 alloys. From the present study, it is demonstrated that both TC and TMS of the Ni-Fe-Ga alloys can be effectively controlled by selecting the substituents.


Keyword:
ferromagnetic shape memory alloy, nickel-iron-gallium alloy, substituent, martensitic transformation, starting temperature, Curie temperature

Received: May 22, 2007
Accepted: July 30, 2007 , Published online: October 25, 2007
Copyright (c) 2007 The Japan Institute of Metals

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