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To optimize the T5 treatment of Al–5.81Zn–1.65 Mg alloys, this study investigated the effect of deformation temperature (300–500 °C) on solution behavior, ultrafine grain (UFG) formation via dynamic recrystallizationDynamic recrystallization (DRX), and strain-induced dynamic precipitation (SIDP) under 70% reduction and 1 s−1 strain rate. Flow stress curves showed work hardening (WH) at 300–350 °C and dynamic recovery at 450–500 °C. First-stage WH rates (ε = 0.2–0.4) decreased from 55 to 10 MPa as temperature increased. DRX grain size and fraction increased with increasing temperature, shifting from discontinuous to continuous DRX. TextureTexture evolved from Goss to brass type with increasing temperature. Precipitates formed by SIDP included η′ and T′ phases, with larger and denser particles at 300 °C. Sufficient solubility and favorable UFG formation were achieved at 400–500 °C, suggesting that this range is optimal for thermomechanical processingThermomechanical processing.

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Temperature-Dependent Flow Stress and Dynamic Metallurgical Phenomena in Al–5.81Zn–1.65 Mg Alloy During Thermomechanical Processing

  • 会议论文

  • 发表日期：

    2026年

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  • Hyung-Won Park,
  • Hyeon-Woo Park,
  • Yuki Shimomura,
  • Yun-Soo Lee,
  • Hyeon-Woo Son,
  • Sungho Jeon,
  • Tomohiro Hata,
  • Jun Yanagimoto

摘要

To optimize the T5 treatment of Al–5.81Zn–1.65 Mg alloys, this study investigated the effect of deformation temperature (300–500 °C) on solution behavior, ultrafine grain (UFG) formation via dynamic recrystallizationDynamic recrystallization (DRX), and strain-induced dynamic precipitation (SIDP) under 70% reduction and 1 s−1 strain rate. Flow stress curves showed work hardening (WH) at 300–350 °C and dynamic recovery at 450–500 °C. First-stage WH rates (ε = 0.2–0.4) decreased from 55 to 10 MPa as temperature increased. DRX grain size and fraction increased with increasing temperature, shifting from discontinuous to continuous DRX. TextureTexture evolved from Goss to brass type with increasing temperature. Precipitates formed by SIDP included η′ and T′ phases, with larger and denser particles at 300 °C. Sufficient solubility and favorable UFG formation were achieved at 400–500 °C, suggesting that this range is optimal for thermomechanical processingThermomechanical processing.