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<p>In this study, a simulated hot forming and quenching (HFQ) process was designed to investigate the microstructure evolution, mechanical properties, and corrosion resistance of a high-strength aluminum alloy. The results indicate that as the die temperature increases, the volume fraction of <i>η</i> phase increases due to the transformation of <i>η</i>′ to <i>η</i> and the decomposition of the supersaturated solid solution (SSSS). In contrast, the amount of <i>η</i>′ phase exhibits an opposite trend. A significant decline in mechanical properties is observed at a die temperature of 250&#xa0;°C, with ultimate tensile strength and yield strength values of 460 and 379&#xa0;MPa, respectively. The hardness variation follows a similar trend to the strength, decreasing from an initial value of 146&#xa0;HV to a final value of 83&#xa0;HV with increasing die temperature. The size of grain boundary precipitates (GBP), the Cu content within them, and the width of the precipitate-free zone (PFZ) all increase with higher die temperature. The synergistic effect of high Cu content and coarse GBP contributes to improved stress corrosion cracking (SCC) resistance. Moreover, the discontinuity of GBP effectively hinders crack propagation and enhances the corrosion resistance of the alloy. The HFQ/350 specimen demonstrates the highest SCC resistance among the tested conditions.</p>

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Investigations on Precipitation Behavior and Performance of High-Strength Aluminum Alloy under Simulated Hot Form and Quench Conditions

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Yang Tian,
  • Zhenshuai Li

摘要

In this study, a simulated hot forming and quenching (HFQ) process was designed to investigate the microstructure evolution, mechanical properties, and corrosion resistance of a high-strength aluminum alloy. The results indicate that as the die temperature increases, the volume fraction of η phase increases due to the transformation of η′ to η and the decomposition of the supersaturated solid solution (SSSS). In contrast, the amount of η′ phase exhibits an opposite trend. A significant decline in mechanical properties is observed at a die temperature of 250 °C, with ultimate tensile strength and yield strength values of 460 and 379 MPa, respectively. The hardness variation follows a similar trend to the strength, decreasing from an initial value of 146 HV to a final value of 83 HV with increasing die temperature. The size of grain boundary precipitates (GBP), the Cu content within them, and the width of the precipitate-free zone (PFZ) all increase with higher die temperature. The synergistic effect of high Cu content and coarse GBP contributes to improved stress corrosion cracking (SCC) resistance. Moreover, the discontinuity of GBP effectively hinders crack propagation and enhances the corrosion resistance of the alloy. The HFQ/350 specimen demonstrates the highest SCC resistance among the tested conditions.