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<p>Hot Forming and Quench (HFQ) is an advanced forming technology applied in the automotive and aviation industries. In this study, HFQ processing of an Al-Zn-Mg-Cu alloy was conducted with deformation amounts of 10-30% followed by three aging treatments. The effects of processing parameters on precipitation behavior and recrystallization mechanisms were systematically investigated. Additionally, the relationship between microstructure and hardness was discussed. Results indicate that pre-aging after hot forming and quench induces the formation of GP zones, while high-temperature baking accelerates the motion of solute atoms, leading to the formation of a certain amount of <i>η'</i> phase. As the deformation amount increases, the dominant recrystallization mechanism evolves from initial discontinuous dynamic recrystallization (DDRX) to continuous dynamic recrystallization (CDRX) and then CDRX + geometric dynamic recrystallization (GDRX). These mechanisms primarily rely on grain boundary migration (GBM), sub-grain rotation (SGR), and a combination of GBM + SGR, respectively. The hardness of the PB specimen is similar to that of PA, attributed to the compensating hardening effect from solid solution strengthening. The significant decrease in hardness for the RRA-treated specimen was due to the formation of large-sized η' phase (~9.02&#xa0;nm) with a low volume fraction (2.5%).</p>

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Investigations into Microstructure Evolution and Hardening Mechanism during Hot Form and Quench Process for Al-Zn-Mg-Cu Alloy

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Junyan Yang,
  • Sharif Hasan Mehdi,
  • Junyu Zhang,
  • Jiongrui Wu,
  • Huaming Wen

摘要

Hot Forming and Quench (HFQ) is an advanced forming technology applied in the automotive and aviation industries. In this study, HFQ processing of an Al-Zn-Mg-Cu alloy was conducted with deformation amounts of 10-30% followed by three aging treatments. The effects of processing parameters on precipitation behavior and recrystallization mechanisms were systematically investigated. Additionally, the relationship between microstructure and hardness was discussed. Results indicate that pre-aging after hot forming and quench induces the formation of GP zones, while high-temperature baking accelerates the motion of solute atoms, leading to the formation of a certain amount of η' phase. As the deformation amount increases, the dominant recrystallization mechanism evolves from initial discontinuous dynamic recrystallization (DDRX) to continuous dynamic recrystallization (CDRX) and then CDRX + geometric dynamic recrystallization (GDRX). These mechanisms primarily rely on grain boundary migration (GBM), sub-grain rotation (SGR), and a combination of GBM + SGR, respectively. The hardness of the PB specimen is similar to that of PA, attributed to the compensating hardening effect from solid solution strengthening. The significant decrease in hardness for the RRA-treated specimen was due to the formation of large-sized η' phase (~9.02 nm) with a low volume fraction (2.5%).