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<p>In this study, different cryogenic deformation pretreatment and hot deformation processes were used to improve the thermally deformed structure, three-dimensional (3D) mechanical properties, and electrical conductivity at the center and edge of 7A85 aluminum alloy. The processes included untreated + uniaxial hot deformation (UUH), uniaxial cryogenic deformation + solution and quenching + uniaxial hot deformation (UCUH), triaxial cryogenic deformation + solution and quenching + uniaxial hot deformation (TCUH), and triaxial cryogenic deformation + solution and quenching + triaxial hot deformation (TCTH). The results showed that the use of cryogenic deformation pretreatment before hot deformation effectively refined the grain and particle structures, and the refining effect of triaxial cryogenic deformation was better than that of uniaxial cryogenic deformation. In contrast, triaxial hot deformation before heat treatment was more likely to cause grain coarsening than uniaxial hot deformation. In addition, under severe triaxial cryogenic deformation, complete particle fragmentation enhanced the aging precipitation, resulting in dense matrix precipitates and a wider precipitate-free zone (PFZ) at grain boundaries. Finally, the diffuse matrix precipitates, the finest equiaxed grains, and the largest grain boundary PFZ width under TCUH resulted in optimal mechanical properties and maximum electrical conductivity at the center and edge.</p> Graphical abstract <p></p>

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A cryogenic deformation pretreatment process for improving the thermally deformed structure and three-dimensional mechanical properties of high-strength aluminum alloy

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Dang Wang,
  • Chong Lin,
  • Yanwei Wang,
  • Mianzhi Tang

摘要

In this study, different cryogenic deformation pretreatment and hot deformation processes were used to improve the thermally deformed structure, three-dimensional (3D) mechanical properties, and electrical conductivity at the center and edge of 7A85 aluminum alloy. The processes included untreated + uniaxial hot deformation (UUH), uniaxial cryogenic deformation + solution and quenching + uniaxial hot deformation (UCUH), triaxial cryogenic deformation + solution and quenching + uniaxial hot deformation (TCUH), and triaxial cryogenic deformation + solution and quenching + triaxial hot deformation (TCTH). The results showed that the use of cryogenic deformation pretreatment before hot deformation effectively refined the grain and particle structures, and the refining effect of triaxial cryogenic deformation was better than that of uniaxial cryogenic deformation. In contrast, triaxial hot deformation before heat treatment was more likely to cause grain coarsening than uniaxial hot deformation. In addition, under severe triaxial cryogenic deformation, complete particle fragmentation enhanced the aging precipitation, resulting in dense matrix precipitates and a wider precipitate-free zone (PFZ) at grain boundaries. Finally, the diffuse matrix precipitates, the finest equiaxed grains, and the largest grain boundary PFZ width under TCUH resulted in optimal mechanical properties and maximum electrical conductivity at the center and edge.

Graphical abstract