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

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 () and Jun Sun ()
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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

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-31222-6

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