Structurally heterogeneous model of extrinsic magnetostriction for Fe-Ga and similar magnetic alloys. Part I. Decomposition and confined displacive transformation

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 DO^sub 3^ ph...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2007-09, Vol.38 (13), p.2308-2316
Main Authors: KHACHATURYAN, A. G, VIEHLAND, D
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Atoms & subatomic particles
Crystal lattices
Exact sciences and technology
Fees & charges
Ferromagnetic materials
Ferromagnetism
Ferrous alloys
Gallium base alloys
Iron
Magnetic alloys
Magnetostriction
Materials science
Metals. Metallurgy
Nanoparticles
Phase transitions
Solid solutions
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Summary: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 DO^sub 3^ 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 [arrow right] tetragonal displacive transformation that brings the structure closer to an equilibrium fcc-based L1^sub 2^ ordered phase. The predictions of our theory are in agreement with existing electron microscopy and X-ray diffraction observations. [PUBLICATION ABSTRACT]
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-007-9253-z