Periodic spinodal decomposition in double–strengthened medium–entropy alloy

Hyojin Park, Farahnaz Haftlang (), Yoon–Uk Heo (), Jae Bok Seol, Zhijun Wang and Hyoung Seop Kim ()
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Hyojin Park: Pohang University of Science and Technology
Farahnaz Haftlang: Pohang University of Science and Technology
Yoon–Uk Heo: Pohang University of Science and Technology
Jae Bok Seol: Gyeongsang National University
Zhijun Wang: Northwestern Polytechnical University
Hyoung Seop Kim: Pohang University of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Achieving an optimal balance between strength and ductility in advanced engineering materials has long been a challenge for researchers. In the field of material strengthening, most approaches that prevent or impede the motion of dislocations involve ductility reduction. In the present study, we propose a strengthening approach based on spinodal decomposition in which Cu and Al are introduced into a ferrous medium–entropy alloy. The matrix undergoes nanoscale periodic spinodal decomposition via a simple one-step aging procedure. Chemical fluctuations within periodic spinodal decomposed structures induce spinodal hardening, leading to a doubled strengthening effect that surpasses the conventional precipitation strengthening mechanism. Notably, the periodic spinodal decomposed structures effectively overcome strain localization issues, preserving elongation and doubling their mechanical strength. Spinodal decomposition offers high versatility because it can be implemented with minimal elemental addition, making it a promising candidate for enhancing the mechanical properties of various alloy systems.

Date: 2024
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DOI: 10.1038/s41467-024-50078-6

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