Stress-strain characteristics in Ni–Ga–Fe ferromagnetic shape memory alloys

Sutou, Y.; Kamiya, N.; Omori, T.; Kainuma, R.; Ishida, K.; Oikawa, K.
February 2004
Applied Physics Letters;2/23/2004, Vol. 84 Issue 8, p1275
Academic Journal
Tensile and compressive stress–strain characteristics for Ni–Ga–Fe ferromagnetic shape memory alloys at several temperatures were investigated by mechanical test and a critical stress versus temperature diagram was obtained. The crystal structure of the martensite phase obtained by tensile-stress-induced martensitic transformation was estimated from the degree of the transformation strain. Stress-induced martensite transformed from the parent phase with an L2[sub 1] structure showed a 14M structure by tensile stress and by further applying stress, the 14M structure martensitically was transformed into an L1[sub 0] structure. Moreover, it was found in the compressive test that variant rearrangement occurred by very low compressive stress less than 3 MPa, which is similar to the phenomenon seen in Ni–Mn–Ga alloys. © 2004 American Institute of Physics.


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