MATERTRANS : Vol. 43 (2002) , No. 9 pp.2360-2362

Magnetic and Martensitic Phase Transformations in a Ni₅₄Ga₂₇Fe₁₉ Alloy

Katsunari Oikawa¹⁾, Takuya Ota²⁾, Yuji Sutou²⁾, Toshihiro Ohmori²⁾, Ryosuke Kainuma²⁾ and Kiyohito Ishida²⁾

1) National Institute of Advanced Industrial Science and Technology, Tohoku Center
2) Department of Materials Science, Graduate School of Engineering, Tohoku University

(Received July 22, 2002)
(Accepted August 12, 2002)

The martensitic and magnetic transitions of Ni₅₄Ga₂₇Fe₁₉ alloy were investigated by differential scanning calorimetry and X-ray powder diffraction and with a vibrating sample magnetometer. The alloy is martensitically transformed from a L2₁ to a martensite phase with a 14M (7R) structure. The ferromagnetic transition is also accompanied by the martensitic transformation from a paramagnetic parent phase to a ferromagnetic martensite phase in the temperature interval between M_s (= 293 K) and M_f (= 274 K). The Ni–Ga–Fe system is promising as a ferromagnetic shape memory alloy.

Keywords:

ferromagnetic shape memory alloy, martensitic transformation, nickel-gallium-iron alloy, phase diagram