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<p>Al–Mg–Si (6xxx) aluminum alloys are extensively utilized in automotive, construction, and aerospace sectors due to their superior mechanical properties and lightweight nature. There is a growing demand for materials that combine enhanced performance with production efficiency. Microalloying has emerged as a promising approach to optimize the mechanical properties of 6xxx alloys. However, few studies have comprehensively investigated the influences of microalloying on microstructural evolution and mechanical properties across the entire production chain. This study systematically examines the role of vanadium (V) in modifying microstructural development from the as-cast state to the deformed microstructure and its subsequent impact on the mechanical behavior of Al–Mg–Si–Mn–Cr alloys. The addition of V was found to significantly accelerate the dissolution of Fe-rich intermetallic phases during homogenization at 550&#xa0;°C. Trace amounts of V were detected in <i>α</i>-Al (Mn, Cr, Fe, V)Si dispersoid phases, where it contributed to a reduction in dispersoid size. The deformed microstructure was governed by synergistic interactions between strain energy, dispersoid phases, and V atoms in solid solution. For samples homogenized for 5&#xa0;h, the recrystallization fraction decreased with increasing V content. In contrast, after 10&#xa0;h of homogenization, the recrystallization fraction increased with higher V levels. The alloy containing 0.15&#xa0;wt% V, homogenized at 550&#xa0;°C for 5&#xa0;h, achieved an optimal combination of enhanced strength and toughness while maintaining high production efficiency. The synergistic enhancement of strength and elongation in V-modified alloys was attributed to V-induced solid solution strengthening, deformed microstructures, and accelerated dissolution of Fe-rich phases.</p>

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Achieving enhanced mechanical property of an Al–Mg–Si alloy with reduced homogenization duration by vanadium addition

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Kang Gao,
  • Zhen Li,
  • Qipeng Dong,
  • Fangzhen Liu,
  • Yu Liu,
  • Jian Qin,
  • Bo Zhang,
  • Hiromi Nagaumi

摘要

Al–Mg–Si (6xxx) aluminum alloys are extensively utilized in automotive, construction, and aerospace sectors due to their superior mechanical properties and lightweight nature. There is a growing demand for materials that combine enhanced performance with production efficiency. Microalloying has emerged as a promising approach to optimize the mechanical properties of 6xxx alloys. However, few studies have comprehensively investigated the influences of microalloying on microstructural evolution and mechanical properties across the entire production chain. This study systematically examines the role of vanadium (V) in modifying microstructural development from the as-cast state to the deformed microstructure and its subsequent impact on the mechanical behavior of Al–Mg–Si–Mn–Cr alloys. The addition of V was found to significantly accelerate the dissolution of Fe-rich intermetallic phases during homogenization at 550 °C. Trace amounts of V were detected in α-Al (Mn, Cr, Fe, V)Si dispersoid phases, where it contributed to a reduction in dispersoid size. The deformed microstructure was governed by synergistic interactions between strain energy, dispersoid phases, and V atoms in solid solution. For samples homogenized for 5 h, the recrystallization fraction decreased with increasing V content. In contrast, after 10 h of homogenization, the recrystallization fraction increased with higher V levels. The alloy containing 0.15 wt% V, homogenized at 550 °C for 5 h, achieved an optimal combination of enhanced strength and toughness while maintaining high production efficiency. The synergistic enhancement of strength and elongation in V-modified alloys was attributed to V-induced solid solution strengthening, deformed microstructures, and accelerated dissolution of Fe-rich phases.