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Structurally Heterogeneous Model of Extrinsic Magnetostriction for Fe-Ga and Similar Magnetic Alloys: Part II. Giant Magnetostriction and Elastic Softening

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Abstract

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 stress-induced 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 DO3 ordered phase, are also discussed. The observed magnetomechanic and elastic softening are consistent with the predictions of the model.

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Acknowledgments

This work was supported by the United States Office of Naval Research through Grant Nos. MURI N00014 06-1-0530 and N00014-06-1-0204 (DV). One of the authors (AGK) is also grateful for the support provided by NSF under Grant No. DMR-0242619.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Rutgers University, Piscataway, NJ, 08854, USA

    A.G. Khachaturyan (State of New Jersey Chair Professor)

  2. Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, 24061, USA

    D. Viehland (Professor)

Authors
  1. A.G. Khachaturyan
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  2. D. Viehland
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Correspondence to A.G. Khachaturyan.

Additional information

Manuscript submitted January 10, 2007.

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Khachaturyan, A., Viehland, D. Structurally Heterogeneous Model of Extrinsic Magnetostriction for Fe-Ga and Similar Magnetic Alloys: Part II. Giant Magnetostriction and Elastic Softening. Metall Mater Trans A 38, 2317–2328 (2007). https://doi.org/10.1007/s11661-007-9252-0

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