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<p>To achieve a balanced strength–ductility profile, 6061 aluminum sheets were processed by accumulative roll bonding (ARB) at room temperature for up to seven passes, followed by solution heat treatment (530&#xa0;°C, 30&#xa0;min) and artificial aging (160&#xa0;°C, 4-24&#xa0;h, to peak age). With increasing ARB passes, tensile strength rose from 183.5 to 402-403&#xa0;MPa while elongation fell from 20.3 to 6.4%. Subsequent heat treatment improved the overall property balance: Elongation increased to 11.8%, with tensile strength adjusting to 353&#xa0;MPa, yielding performance superior to the conventional T6 condition. Microstructural characterization indicates that ARB refines grains and elevates dislocation density, accounting for the strength increase and ductility loss. Solution treatment and aging then promote recovery/recrystallization and a fine dispersion of nanoprecipitates, which reduce dislocation density and restore ductility while retaining substantial strength. The combined processing route—simple in equipment requirements and compatible with rolling-mill practice—offers a viable pathway toward industrial implementation of ARB plus heat treatment for 6xxx-series sheets.</p>

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Balancing Strength and Ductility in AA6061 Aluminum Alloy: Synergistic Effects of Accumulative Roll Bonding Combined with Heat Treatment

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Zijian Wang,
  • Zhibin Zhang,
  • Hanlin Ding,
  • Chongchen Xiang,
  • Weikang Liang

摘要

To achieve a balanced strength–ductility profile, 6061 aluminum sheets were processed by accumulative roll bonding (ARB) at room temperature for up to seven passes, followed by solution heat treatment (530 °C, 30 min) and artificial aging (160 °C, 4-24 h, to peak age). With increasing ARB passes, tensile strength rose from 183.5 to 402-403 MPa while elongation fell from 20.3 to 6.4%. Subsequent heat treatment improved the overall property balance: Elongation increased to 11.8%, with tensile strength adjusting to 353 MPa, yielding performance superior to the conventional T6 condition. Microstructural characterization indicates that ARB refines grains and elevates dislocation density, accounting for the strength increase and ductility loss. Solution treatment and aging then promote recovery/recrystallization and a fine dispersion of nanoprecipitates, which reduce dislocation density and restore ductility while retaining substantial strength. The combined processing route—simple in equipment requirements and compatible with rolling-mill practice—offers a viable pathway toward industrial implementation of ARB plus heat treatment for 6xxx-series sheets.