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Structurally Heterogeneous Model of Extrinsic Magnetostriction for Fe-Ga and Similar Magnetic Alloys: Part I. Decomposition and Confined Displacive Transformation

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Abstract

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 → tetragonal displacive transformation that brings the structure closer to an equilibrium fcc-based L12 ordered phase. The predictions of our theory are in agreement with existing electron microscopy and X-ray diffraction observations.

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Acknowledgments

This work was supported by the 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 under NSF 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 I. Decomposition and Confined Displacive Transformation. Metall Mater Trans A 38, 2308–2316 (2007). https://doi.org/10.1007/s11661-007-9253-z

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