Structurally heterogeneous model of extrinsic magnetostriction for Fe-Ga and similar magnetic alloys: Part 1. Decomposition and confined displacive transformation
(Englisch)
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A compositionally and structurally heterogeneous model for ferromagnetic alloys has been developed and applied to Fe-Ga alloys that exhibit giant magnetostriction. Our model assumes that the Fe-Ga bcc solid solution near its solubility limit is a coarsening-resistant nanodispersion of a DO3 phase that is formed due to coherency lifting by excess vacancies, as is known to be the case for chemically similar Fe-Al alloys. This compositionally heterogeneous state undergoes a cubic tends to tetragonal displacive transformation that brings the structure closer to an equilibrium fcc-based LI2 ordered phase. The predictions of our theory are in agreement with existing electron microscopy and X-ray diffraction observations.
Structurally heterogeneous model of extrinsic magnetostriction for Fe-Ga and similar magnetic alloys: Part 1. Decomposition and confined displacive transformation