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Local Displacive Phase Transformation in Large-Magnetostriction Alloy Fe81Ga19

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Abstract

Soluting nonmagnetic Ga into body-centered-cubic (BCC) Fe has been found to create over tenfold enhancement in magnetostriction—a fundamental property of ferromagnetic materials, but the underlying origin remains elusive. It was shown that such extraordinary magnetostriction enhancement is closely related to lattice softening, analogous to the scenario of displacive/martensitic phase transformation. In this work, we report the {111}BCC collapse-induced hexagonal ω phase in the magnetostriction-peak alloy Fe81Ga19. The local BCC to ω phase transformation was observed at highly strained non-equilibrium state, where artificial-aging-induced tetragonal L60 intermediate phase and L12 equilibrium phase coexist with the BCC matrix. The mechanically harder L60/L12 phases exert strong shear stress along < 111 > BCC direction on the mechanically softer BCC matrix, leading to the formation of ω phase at the phase interface. This study provides new evidence for the lattice softening of Fe–Ga alloys, adding important insight into understanding their extraordinary magnetostriction effect.

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Acknowledgments

This work was supported by the National Key Research and Development Program of China (No. 2021YFB3501401) and National Natural Science Foundation of China (Nos. 51871174 and 51831006). T. Ma would like to thank Prof. Kazuhiro Otsuka for fruitful discussion and kind help when he did the related work in NIMS, Japan.

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Authors and Affiliations

  1. Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China

    Yiqun Zhang, Junming Gou, Tianzi Yang & Tianyu Ma

  2. Ferroic Physics Group, National Institute for Materials Science, Tsukuba, 305-0047, Japan

    Xiaobing Ren

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  1. Yiqun Zhang
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  2. Junming Gou
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  3. Tianzi Yang
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Correspondence to Tianyu Ma.

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This invited article is part of a special issue of Shape Memory and Superelasticity honoring Professor Kazuhiro Otsuka for his 50 years of research on shape memory alloys and his 85th birthday. The special issue was organized by Dr. Xiaobing Ren, National Institute for Materials Science; Prof. Antoni Planes, University of Barcelona; and Dr. Avadh Saxena, Los Alamos National Lab.

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Zhang, Y., Gou, J., Yang, T. et al. Local Displacive Phase Transformation in Large-Magnetostriction Alloy Fe81Ga19. Shap. Mem. Superelasticity 9, 313–320 (2023). https://doi.org/10.1007/s40830-023-00423-3

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