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Doubled strength and ductility via maraging effect and dynamic precipitate transformation in ultrastrong medium-entropy alloy

Author

Listed:
  • Hyun Chung

    (Korea University)

  • Won Seok Choi

    (Korea Advanced Institute of Science and Technology
    SK Innovation)

  • Hosun Jun

    (Korea Advanced Institute of Science and Technology)

  • Hyeon-Seok Do

    (Pohang University of Science and Technology)

  • Byeong-Joo Lee

    (Pohang University of Science and Technology)

  • Pyuck-Pa Choi

    (Korea Advanced Institute of Science and Technology)

  • Heung Nam Han

    (Seoul National University)

  • Won-Seok Ko

    (Inha University)

  • Seok Su Sohn

    (Korea University)

Abstract

Demands for ultrahigh strength in structural materials have been steadily increasing in response to environmental issues. Maraging alloys offer a high tensile strength and fracture toughness through a reduction of lattice defects and formation of intermetallic precipitates. The semi-coherent precipitates are crucial for exhibiting ultrahigh strength; however, they still result in limited work hardening and uniform ductility. Here, we demonstrate a strategy involving deformable semi-coherent precipitates and their dynamic phase transformation based on a narrow stability gap between two kinds of ordered phases. In a model medium-entropy alloy, the matrix precipitate acts as a dislocation barrier and also dislocation glide media; the grain-boundary precipitate further contributes to a significant work-hardening via dynamic precipitate transformation into the type of matrix precipitate. This combination results in a twofold enhancement of strength and uniform ductility, thus suggesting a promising alloy design concept for enhanced mechanical properties in developing various ultrastrong metallic materials.

Suggested Citation

  • Hyun Chung & Won Seok Choi & Hosun Jun & Hyeon-Seok Do & Byeong-Joo Lee & Pyuck-Pa Choi & Heung Nam Han & Won-Seok Ko & Seok Su Sohn, 2023. "Doubled strength and ductility via maraging effect and dynamic precipitate transformation in ultrastrong medium-entropy alloy," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-35863-z
    DOI: 10.1038/s41467-023-35863-z
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    References listed on IDEAS

    as
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    2. Ying Yang & Tianyi Chen & Lizhen Tan & Jonathan D. Poplawsky & Ke An & Yanli Wang & German D. Samolyuk & Ken Littrell & Andrew R. Lupini & Albina Borisevich & Easo P. George, 2021. "Bifunctional nanoprecipitates strengthen and ductilize a medium-entropy alloy," Nature, Nature, vol. 595(7866), pages 245-249, July.
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