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Crystallographic and Magnetic Domains in Heat-Treated Fe–N Alloy Containing α″-Fe16N2 Phase

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Abstract

Heat treatment of martensite in Fe–N alloy produces α″-Fe16N2 phase, which appears to show a giant magnetic flux density that exceeds the upper limit predicted by the Slater–Pauling curve. Here, we reveal the relationship between the crystallographic microstructure and the magnetic domain structure in a heat-treated Fe–N alloy. Transmission electron microscopy observations revealed a complex crystallographic microstructure in the heat-treated specimen: lamellae composed of α″-Fe16N2, α-Fe, and γ′-Fe4N phases. Electron holography was used to map the magnetic flux lines in the mixed-phase state and revealed a substantial magnetocrystalline anisotropy of the α″-Fe16N2 phase. The observations provide useful information for engineering of the α″-Fe16N2 phase.

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Acknowledgements

This work was supported in part by KAKENHI (Grant Nos. 21H04623 and 22K18904) funded by JSPS and the program for advanced research equipment platforms by MEXT (Grant No. JPMXS0450200121).

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Authors and Affiliations

  1. The Ultramicroscopy Research Center, Kyushu University, Fukuoka, 819-0395, Japan

    Takehiro Tamaoka & Yasukazu Murakami

  2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, 980-8577, Japan

    Satoshi Okamoto

  3. Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka, 819-0395, Japan

    Yasukazu Murakami

Authors
  1. Takehiro Tamaoka
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  2. Satoshi Okamoto
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  3. Yasukazu Murakami
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Corresponding authors

Correspondence to Takehiro Tamaoka or Yasukazu Murakami.

Additional information

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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Tamaoka, T., Okamoto, S. & Murakami, Y. Crystallographic and Magnetic Domains in Heat-Treated Fe–N Alloy Containing α″-Fe16N2 Phase. Shap. Mem. Superelasticity 9, 293–299 (2023). https://doi.org/10.1007/s40830-023-00417-1

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  • DOI: https://doi.org/10.1007/s40830-023-00417-1

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