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<p>Rare earth microalloying effectively enhances magnesium alloy performance. This study designed Mg-2Y-1Al (WA21) and its Ca/Mn-modified variants (0.3Ca-0.7Mn, 0.5Ca-0.5Mn, 0.7Ca-0.3Mn) to investigate their 200&#xa0;°C compressive behavior. Thermal compression tests (0.001&#xa0;s<sup>−1</sup>, <i>ε</i> = 0.3) revealed that trace Ca/Mn additions significantly improved compressive yield strength (CYS) and ultimate compressive strength. EBSD analysis demonstrated remarkable grain refinement, with WAXM210505 achieving a 50% reduction in average grain size (20.32&#xa0;μm) compared to WA21. In-grain misorientation axis (IGMA) and Schmidt factor analyses indicated that pyramidal &lt;<i>c </i> + <i>a  </i>&gt; slip dominated deformation across all alloys, accompanied by limited prismatic &lt;<i>a  </i>&gt; slip. Discontinuous dynamic recrystallization (DDRX) was identified as the primary DRX mechanism, with Ca/Mn additions promoting DRX development and texture weakening. The refined microstructure and optimized slip activity collectively contributed to enhanced high-temperature strength. These findings elucidate the role of Ca/Mn ratio in balancing slip system activation and DRX kinetics, providing critical insights for designing heat-resistant Mg-Y-Al alloys tailored for compressive load applications, providing new insights for the development of low-cost magnesium alloys with excellent service performance.</p>

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Influence of Ca and Mn Contents on Deformation Behavior and Mechanical Properties of Thermal Compressed Mg-2Y-1Al Alloy

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Yunduo Feng,
  • Yanzhuo Liu,
  • Shengquan Liang,
  • Jinhui Wang,
  • Shiyu Luan

摘要

Rare earth microalloying effectively enhances magnesium alloy performance. This study designed Mg-2Y-1Al (WA21) and its Ca/Mn-modified variants (0.3Ca-0.7Mn, 0.5Ca-0.5Mn, 0.7Ca-0.3Mn) to investigate their 200 °C compressive behavior. Thermal compression tests (0.001 s−1, ε = 0.3) revealed that trace Ca/Mn additions significantly improved compressive yield strength (CYS) and ultimate compressive strength. EBSD analysis demonstrated remarkable grain refinement, with WAXM210505 achieving a 50% reduction in average grain size (20.32 μm) compared to WA21. In-grain misorientation axis (IGMA) and Schmidt factor analyses indicated that pyramidal <c  + a  > slip dominated deformation across all alloys, accompanied by limited prismatic <a  > slip. Discontinuous dynamic recrystallization (DDRX) was identified as the primary DRX mechanism, with Ca/Mn additions promoting DRX development and texture weakening. The refined microstructure and optimized slip activity collectively contributed to enhanced high-temperature strength. These findings elucidate the role of Ca/Mn ratio in balancing slip system activation and DRX kinetics, providing critical insights for designing heat-resistant Mg-Y-Al alloys tailored for compressive load applications, providing new insights for the development of low-cost magnesium alloys with excellent service performance.