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Periodic spinodal decomposition in double–strengthened medium–entropy alloy

Author

Listed:
  • Hyojin Park

    (Pohang University of Science and Technology
    Pohang University of Science and Technology)

  • Farahnaz Haftlang

    (Pohang University of Science and Technology
    Pohang University of Science and Technology
    Northwestern University)

  • 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
    Pohang University of Science and Technology
    Tohoku University
    Yonsei University)

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.

Suggested Citation

  • Hyojin Park & Farahnaz Haftlang & Yoon–Uk Heo & Jae Bok Seol & Zhijun Wang & Hyoung Seop Kim, 2024. "Periodic spinodal decomposition in double–strengthened medium–entropy alloy," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50078-6
    DOI: 10.1038/s41467-024-50078-6
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    References listed on IDEAS

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    2. Tong Li & Tianwei Liu & Shiteng Zhao & Yan Chen & Junhua Luan & Zengbao Jiao & Robert O. Ritchie & Lanhong Dai, 2023. "Ultra-strong tungsten refractory high-entropy alloy via stepwise controllable coherent nanoprecipitations," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
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    4. Y. H. Jo & S. Jung & W. M. Choi & S. S. Sohn & H. S. Kim & B. J. Lee & N. J. Kim & S. Lee, 2017. "Cryogenic strength improvement by utilizing room-temperature deformation twinning in a partially recrystallized VCrMnFeCoNi high-entropy alloy," Nature Communications, Nature, vol. 8(1), pages 1-8, August.
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