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<p>Five cold-rolled Al-xMg-1.0Mn alloys containing 4.25–6.38&#xa0;wt.% Mg were investigated to clarify the effect of Mg content on stabilization annealing behavior, microstructural evolution, and intergranular corrosion (IGC) susceptibility. Increasing Mg content raised the recrystallization start temperature and enhanced the driving force for β-Al3Mg2 precipitation. Consequently, the alloys exhibited higher intergranular corrosion susceptibility. During low-temperature stabilization annealing, alloys containing ≥ 4.67&#xa0;wt.% Mg showed a distinct sensitization–reversion behavior. The nitric acid mass loss test (NAMLT) showed that mass loss initially increased and subsequently decreased with annealing time. This behavior is consistent with the changes in the continuity and distribution of grain-boundary precipitation features during prolonged annealing. The sensitization–reversion behavior became more pronounced with increasing Mg content, and the corresponding temperature window shifted toward higher temperatures. Among the investigated alloys, the Al-4.67&#xa0;Mg alloy exhibited the most favorable balance between mechanical properties and corrosion resistance after annealing at 230°C for 5&#xa0;h. The present work establishes the relationship between Mg content, grain-boundary precipitation evolution, intergranular corrosion susceptibility, and mechanical-property retention during stabilization annealing. These findings provide guidance for the optimization of heat-treatment schedules for high-Mg 5xxx-series aluminum alloys.</p>

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Effect of Mg Content on Sensitization–Reversion Behavior and Mechanical–Corrosion Synergy in Al-Mg-Mn Alloys

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Cheng-cheng Chen,
  • Zhao-xi Song,
  • Ya-jun Xu,
  • Zhen-yu Wu,
  • Lu-min Gou,
  • Hao Luo,
  • Jian Bao,
  • Zhao-song Zhang,
  • Jian-zhong Cui,
  • Xiang-jie Wang

摘要

Five cold-rolled Al-xMg-1.0Mn alloys containing 4.25–6.38 wt.% Mg were investigated to clarify the effect of Mg content on stabilization annealing behavior, microstructural evolution, and intergranular corrosion (IGC) susceptibility. Increasing Mg content raised the recrystallization start temperature and enhanced the driving force for β-Al3Mg2 precipitation. Consequently, the alloys exhibited higher intergranular corrosion susceptibility. During low-temperature stabilization annealing, alloys containing ≥ 4.67 wt.% Mg showed a distinct sensitization–reversion behavior. The nitric acid mass loss test (NAMLT) showed that mass loss initially increased and subsequently decreased with annealing time. This behavior is consistent with the changes in the continuity and distribution of grain-boundary precipitation features during prolonged annealing. The sensitization–reversion behavior became more pronounced with increasing Mg content, and the corresponding temperature window shifted toward higher temperatures. Among the investigated alloys, the Al-4.67 Mg alloy exhibited the most favorable balance between mechanical properties and corrosion resistance after annealing at 230°C for 5 h. The present work establishes the relationship between Mg content, grain-boundary precipitation evolution, intergranular corrosion susceptibility, and mechanical-property retention during stabilization annealing. These findings provide guidance for the optimization of heat-treatment schedules for high-Mg 5xxx-series aluminum alloys.