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This paper examines the phonon dispersion and static local atomic distortion of iron-manganese-based Elinvar alloys using high-resolution inelastic X-ray scattering, magnetization, neutron diffraction, and neutron total scattering. In this study, nonlinear phonon dispersion was observed for a transverse acoustic mode near zone center, associated with (𝐶11−𝐶12)/2 elastic constants, over a wide temperature range along the 𝛤⁡(220) to X (310) points of the face-centered cubic system, indicating lattice instability coupled with tetragonal distortions in the long-wavelength limit. Bulk magnetization and neutron diffraction measurements suggest that the conventional ferromagnetic magnetostriction scenario is not the origin of Elinvar characteristics. Instead, the martensitic transformation and lattice instabilities underlie these phenomena. The reduced pair distribution function reveals a significant discrepancy between local and global (averaged) structures suggesting the influence of atomic-scale lattice disorder and instability in FeMn-based Elinvar alloys.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Iron-manganese based alloy, Elinvar, martensitic transformation, phonon softening, local distortion

刊行年月日: 2025-12-31

出版者: Taylor & Francis

掲載誌:

• Science and Technology of Advanced Materials (ISSN: 14686996) vol. 26 2540278

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5627

公開URL: https://doi.org/10.1080/14686996.2025.2540278

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更新時刻: 2025-08-06 08:30:28 +0900

MDRでの公開時刻: 2025-08-06 08:19:53 +0900