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<p>This paper systematically analyzes the effects of microstructural changes on the mechanical properties of Mg-5Sn-2Zn-0.5Zr (TZK) alloys following hot extrusion deformation at 300&#xa0;°C and under various heat treatment conditions (200&#xa0;°C, <i>t</i> = 0, 10, 20, 30&#xa0;h). The results demonstrate that the alloy underwent significant dynamic recrystallization after hot extrusion. After 10&#xa0;h of heat treatment, the grains were gradually refined to form uniformly distributed equiaxed grains, a result of the static recrystallization occurring during the heat treatment process. The yield strength (YS) increased by 8.4% to 194&#xa0;MPa after a 10&#xa0;h heat treatment, while its ultimate tensile strength (UTS) and elongation (El) remained at 279&#xa0;MPa and 18.2%, respectively. The superior mechanical properties of the 200&#xa0;°C * 10 h alloy can be primarily attributed to grain refinement and the strengthening of precipitated phases, while the favorable plasticity is linked to grain refinement and the weakening of texture.</p>

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Effects of Different Heat Treatment Processes on the Microstructure and Mechanical Properties of Mg-Sn-Zn-Zr Alloy

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Tong Zhou,
  • Yaqin Li,
  • Tianshui Zhou,
  • Lanfeng Li,
  • Shiwen Hu,
  • Xiaoqiang Li,
  • Dexue Liu

摘要

This paper systematically analyzes the effects of microstructural changes on the mechanical properties of Mg-5Sn-2Zn-0.5Zr (TZK) alloys following hot extrusion deformation at 300 °C and under various heat treatment conditions (200 °C, t = 0, 10, 20, 30 h). The results demonstrate that the alloy underwent significant dynamic recrystallization after hot extrusion. After 10 h of heat treatment, the grains were gradually refined to form uniformly distributed equiaxed grains, a result of the static recrystallization occurring during the heat treatment process. The yield strength (YS) increased by 8.4% to 194 MPa after a 10 h heat treatment, while its ultimate tensile strength (UTS) and elongation (El) remained at 279 MPa and 18.2%, respectively. The superior mechanical properties of the 200 °C * 10 h alloy can be primarily attributed to grain refinement and the strengthening of precipitated phases, while the favorable plasticity is linked to grain refinement and the weakening of texture.