Achieving remarkable enhancement of yield strength ensuring large ductility in a metastable Fe50Mn30Cr10Co10 high-entropy alloy via warm rolling treatment

Xiaodong Lan; Kaneaki Tsuzaki; Rintaro Ueji; Akinobu Shibata

doi:10.2355/isijinternational.isijint-2025-129

論文 Achieving remarkable enhancement of yield strength ensuring large ductility in a metastable Fe₅₀Mn₃₀Cr₁₀Co₁₀ high-entropy alloy via warm rolling treatment

Xiaodong Lan ; Kaneaki Tsuzaki ; Rintaro Ueji ; Akinobu Shibata

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Xiaodong Lan, Kaneaki Tsuzaki, Rintaro Ueji, Akinobu Shibata. Achieving remarkable enhancement of yield strength ensuring large ductility in a metastable Fe₅₀Mn₃₀Cr₁₀Co₁₀ high-entropy alloy via warm rolling treatment. ISIJ International. 2025, 65 (9), ISIJINT-2025-129. https://doi.org/10.2355/isijinternational.isijint-2025-129

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(abstract)

The metastable Fe50Mn30Cr10Co10 (at. %) high-entropy alloy (HEA) integrates the principles of HEA and transformation-induced plasticity (TRIP), resulting in an exceptional combination of tensile strength and ductility. However, the inherently low yield strength restricts its application as a structural material. In this study, 50% warm rolling at 573 K was employed as a straightforward and cost-effective thermomechanical processing strategy to fabricate metastable Fe50Mn30Cr10Co10 HEA with enhanced yield strength while retaining large ductility. The mechanical responses and deformation behaviors of the metastable HEA were examined using room temperature tensile tests, along with postmortem X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) analyses. Compared to the fully recrystallized counterparts, the warm-rolled specimens exhibited a threefold increase in yield strength while retaining substantial uniform elongation. The warm rolling treatment increased the mechanical stability of the austenitic phase against stress-assisted γ-ε martensitic transformation, shifting the yielding mechanism from martensitic transformation to dislocation slip, thereby enhancing the yield strength. Moreover, warm rolling completely suppressed the athermal γ-ε martensitic transformation even at 77 K, while the strain-induced γ-ε martensitic transformation remained pronounced at room temperature, contributing to the alloy’s high strength and large ductility.

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