Structurally heterogeneous model of extrinsic magnetostriction for Fe-Ga and similar magnetic alloys. Part II. Giant magnetostriction and elastic softening

A compositionally and structurally heterogeneous model for decomposing ferromagnetic alloys was developed in Part I of this article, and applied to Fe-Ga alloys. Here, we show that the giant extrinsic magnetostriction and elastic softening of these alloys can be caused by the macroscopic strain gene...

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Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2007-09, Vol.38 (13), p.2317-2328
Main Authors: KHACHATURYAN, A. G, VIEHLAND, D
Format: Article
Language:English
Subjects:
Applied sciences
Crystal lattices
Exact sciences and technology
Magnetic fields
Metallurgy
Metals. Metallurgy
Nanoparticles
Quenching
Single crystals
Solid solutions
Temperature
Vacancies
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description A compositionally and structurally heterogeneous model for decomposing ferromagnetic alloys was developed in Part I of this article, and applied to Fe-Ga alloys. Here, we show that the giant extrinsic magnetostriction and elastic softening of these alloys can be caused by the macroscopic strain generated by a magnetic-field-induced confined displacive transformation or a stressinduced reorientation of tetragonal phase microdomains that form due to this underlying compositional heterogeneity. The exchange mechanism of the microdomain reorientation under an applied magnetic field is considered. A possibility of other mechanisms, associated with dislocations in the bcc solution or antiphase boundaries in the DO^sub 3^ ordered phase, are also discussed. The observed magnetomechanic and elastic softening are consistent with the predictions of the model. [PUBLICATION ABSTRACT]
doi_str_mv 10.1007/s11661-007-9252-0
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subjects Applied sciences
Crystal lattices
Exact sciences and technology
Magnetic fields
Metallurgy
Metals. Metallurgy
Nanoparticles
Quenching
Single crystals
Solid solutions
Temperature
Vacancies
title Structurally heterogeneous model of extrinsic magnetostriction for Fe-Ga and similar magnetic alloys. Part II. Giant magnetostriction and elastic softening
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