Magnetic and martensitic phase transitions in ferromagnetic Ni–Ga–Fe shape memory alloys

Oikawa, K.; Ota, T.; Ohmori, T.; Tanaka, Y.; Morito, H.; Fujita, A.; Kainuma, R.; Fukamichi, K.; Ishida, K.
December 2002
Applied Physics Letters;12/30/2002, Vol. 81 Issue 27, p5201
Academic Journal
Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni-Ga-Fe system have been developed. The alloys with the composition range of Ni 27 at. % Ga (20-22 at. %) Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L2[sub 1] parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the ferromagnetic state. The parent phase transforms from the B2 to the L2[sub 1] structure at about 970 K during cooling, and the degree of the L2[sub 1] order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for ferromagnetic shape memory alloys.


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