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<p>The effects of different heat treatment processes (solution treatment, direct artificial aging, and combined natural aging followed by artificial aging processes) on the microstructure evolution, mechanical properties, and corrosion behavior of the injection-molded Mg-2Zn-0.5Ca-1Nd alloy were investigated. The results indicate that the injection-molded specimens possess a fine-grained microstructure. After solution treatment, grain coarsening occurs and most of the second phase particles dissolve into the magnesium matrix. During the aging process, significant differences are observed in the morphology and distribution of the precipitated phases. Direct artificial aging (6&#xa0;h) enables the alloy to reach its peak hardness (HV 71.7), with the precipitated phase consisting of relatively large, discretely distributed spherical particles. In contrast, the combined natural aging followed by artificial aging promotes the precipitation of fine, uniformly distributed granular and short rod-shaped second phase particles. This microstructural characteristic not only significantly enhances the alloy’s mechanical properties through precipitation hardening, but also promotes uniform corrosion, effectively suppressing the occurrence of pitting corrosion. Consequently, the alloy exhibits excellent comprehensive mechanical and corrosion resistance properties.</p>

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Effects of Solution Treatment and Combined Aging on Microstructure and Properties of Mg-2Zn-0.5Ca-1Nd Alloy

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Yong Hu,
  • Yang Tian,
  • Jiehua Li,
  • Zhijie Yan,
  • Chen Chen,
  • Jinbao Lin

摘要

The effects of different heat treatment processes (solution treatment, direct artificial aging, and combined natural aging followed by artificial aging processes) on the microstructure evolution, mechanical properties, and corrosion behavior of the injection-molded Mg-2Zn-0.5Ca-1Nd alloy were investigated. The results indicate that the injection-molded specimens possess a fine-grained microstructure. After solution treatment, grain coarsening occurs and most of the second phase particles dissolve into the magnesium matrix. During the aging process, significant differences are observed in the morphology and distribution of the precipitated phases. Direct artificial aging (6 h) enables the alloy to reach its peak hardness (HV 71.7), with the precipitated phase consisting of relatively large, discretely distributed spherical particles. In contrast, the combined natural aging followed by artificial aging promotes the precipitation of fine, uniformly distributed granular and short rod-shaped second phase particles. This microstructural characteristic not only significantly enhances the alloy’s mechanical properties through precipitation hardening, but also promotes uniform corrosion, effectively suppressing the occurrence of pitting corrosion. Consequently, the alloy exhibits excellent comprehensive mechanical and corrosion resistance properties.