Elasticity and magnetoelasticity of Fe–Ga solid solutions

Wuttig, Manfred; Dai, Liyang; Cullen, James
February 2002
Applied Physics Letters;2/18/2002, Vol. 80 Issue 7, p1135
Academic Journal
Continuous-wave measurements of the shear elastic constants of bcc Fe-Ga solid solutions show that the constant C[SUB 44] is independent of the gallium composition while the constant ½(C[SUB 11]-C[SUB 12]) decreases linearly and extrapolates to zero at 26 at. % Ga. This result indicates that the Fe-Ga solid solution is inhomogeneous and contains clusters consisting of embryos of a martensitic phase. The increasing softness of ½(C[SUB 11]-C[SUB 12]) then reflects an increase of the embryo density. A model assuming that the clusters are centered around next-nearest Ga pairs reproduces the known composition dependence of the magnetostrictive constant λ100 in the composition range 0


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