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Synergy of multiple precipitate/matrix interface structures for a heat resistant high-strength Al alloy

Author

Listed:
  • Qiang Lu

    (Central South University)

  • Jianchuan Wang

    (Central South University)

  • Hongcheng Li

    (Nanjing University of Science and Technology)

  • Shenbao Jin

    (Nanjing University of Science and Technology)

  • Gang Sha

    (Nanjing University of Science and Technology)

  • Jiangbo Lu

    (Shaanxi Normal University)

  • Li Wang

    (Central South University)

  • Bo Jin

    (Central South University)

  • Xinyue Lan

    (Central South University)

  • Liya Li

    (Central South University)

  • Kai Li

    (Central South University
    Central South University)

  • Yong Du

    (Central South University)

Abstract

High strength aluminum alloys are widely used but their strength is reduced as nano-precipitates coarsen rapidly in medium and high temperatures, which greatly limits their application. Single solute segregation layers at precipitate/matrix interfaces are not satisfactory in stabilizing precipitates. Here we obtain multiple interface structures in an Al-Cu-Mg-Ag-Si-Sc alloy including Sc segregation layers, C and L phases as well as a newly discovered χ-AgMg phase, which partially cover the θ′ precipitates. By atomic resolution characterizations and ab initio calculations, such interface structures have been confirmed to synergistically retard coarsening of precipitates. Therefore, the designed alloy shows the good combination of heat resistance and strength among all series of Al alloys, with 97% yield strength retained after thermal exposure, which is as high as 400 MPa. This concept of covering precipitates with multiple interface phases and segregation layers provides an effective strategy for designing other heat resistant materials.

Suggested Citation

  • Qiang Lu & Jianchuan Wang & Hongcheng Li & Shenbao Jin & Gang Sha & Jiangbo Lu & Li Wang & Bo Jin & Xinyue Lan & Liya Li & Kai Li & Yong Du, 2023. "Synergy of multiple precipitate/matrix interface structures for a heat resistant high-strength Al alloy," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38730-z
    DOI: 10.1038/s41467-023-38730-z
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    References listed on IDEAS

    as
    1. Laure Bourgeois & Yong Zhang & Zezhong Zhang & Yiqiang Chen & Nikhil V. Medhekar, 2020. "Transforming solid-state precipitates via excess vacancies," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    2. Peter V. Liddicoat & Xiao-Zhou Liao & Yonghao Zhao & Yuntian Zhu & Maxim Y. Murashkin & Enrique J. Lavernia & Ruslan Z. Valiev & Simon P. Ringer, 2010. "Nanostructural hierarchy increases the strength of aluminium alloys," Nature Communications, Nature, vol. 1(1), pages 1-7, December.
    3. Shenghua Wu & Hanne S. Soreide & Bin Chen & Jianjun Bian & Chong Yang & Chunan Li & Peng Zhang & Pengming Cheng & Jinyu Zhang & Yong Peng & Gang Liu & Yanjun Li & Hans J. Roven & Jun Sun, 2022. "Freezing solute atoms in nanograined aluminum alloys via high-density vacancies," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
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