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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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.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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Summary: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]
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-007-9252-0