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An extraordinary elongation of over 156 % was achieved in single crystal Fe-15Mn-10Cr-8Ni-4Si alloy, which shows γ → ε → α’ transformation. Tensile tests were conducted along the <414>, <111>, and <100> directions, and the deformed microstructure was characterized with electron-backscattering diffraction (EBSD). Elongation in <414> orientation (156%) was highest as ever recorded in metallic alloy—approximately twice that of conventional TWIP steels. Mechanical behavior in <414> is characterized with slow work hardening, with upward curvature in the stress–strain curve. EBSD analysis revealed 45% of ε-martensite and significant γ-twin microstructure components in <414>. In the initial stage, deformation was marked by planar slip and a sluggish γ → ε transformation, activating a single ε-martensite variant with a Schmid factor of 0.5. Later stages witnessed crystal rotation towards <112>, generating multiple shear bands and distinct ε variants. Fractures predominantly occurred along the <011> direction, with the fracture surface exhibiting a ductile nature.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: Extraordinary plasticity, Damping steel, Single crystal, Martensitic transformation, Shear band

刊行年月日: 2024-09-18

出版者: Elsevier BV

掲載誌:

• Scripta Materialia (ISSN: 13596462) vol. 255 116382

研究助成金:

• Japan Society for the Promotion of Science JSPS-21H01659
• Japan Society for the Promotion of Science JSPS-23K13227

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4837

公開URL: https://doi.org/10.1016/j.scriptamat.2024.116382

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更新時刻: 2024-10-11 10:59:14 +0900

MDRでの公開時刻: 2026-09-18 08:30:46 +0900