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Freezing solute atoms in nanograined aluminum alloys via high-density vacancies

Author

Listed:
  • Shenghua Wu

    (Xi’an Jiaotong University)

  • Hanne S. Soreide

    (Norwegian University of Science and Technology)

  • Bin Chen

    (School of Physical Science and Technology and Electron Microscopy Centre of Lanzhou University, Lanzhou University)

  • Jianjun Bian

    (University of Padova, Via Gradenigo 6/a)

  • Chong Yang

    (Xi’an Jiaotong University)

  • Chunan Li

    (Norwegian University of Science and Technology)

  • Peng Zhang

    (Xi’an Jiaotong University)

  • Pengming Cheng

    (Xi’an Jiaotong University)

  • Jinyu Zhang

    (Xi’an Jiaotong University)

  • Yong Peng

    (School of Physical Science and Technology and Electron Microscopy Centre of Lanzhou University, Lanzhou University)

  • Gang Liu

    (Xi’an Jiaotong University)

  • Yanjun Li

    (Norwegian University of Science and Technology)

  • Hans J. Roven

    (Norwegian University of Science and Technology)

  • Jun Sun

    (Xi’an Jiaotong University)

Abstract

Low-temperature decomposition of supersaturated solid solution into unfavorable intergranular precipitates is a long-standing bottleneck limiting the practical applications of nanograined aluminum alloys that are prepared by severe plastic deformation. Minimizing the vacancy concentration is generally regarded as an effective approach in suppressing the decomposition process. Here we report a counterintuitive strategy to stabilize supersaturated solid solution in nanograined Al-Cu alloys via high-density vacancies in combination with Sc microalloying. By generating a two orders of magnitude higher concentration of vacancies bonded in strong (Cu, Sc, vacancy)-rich atomic complexes, a high thermal stability is achieved in an Al-Cu-Sc alloy that precipitation is nearly suppressed up to ~230 °C. The solute-vacancy complexes also enable the nanograined Al-Cu alloys with higher strength, greater strain hardening capability and ductility. These findings provide perspectives towards the great potentials of solute-vacancy interaction and the development of nanograined alloys with high stability and well-performed mechanical properties.

Suggested Citation

  • 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.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31222-6
    DOI: 10.1038/s41467-022-31222-6
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    References listed on IDEAS

    as
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    Cited by:

    1. 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.

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