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<p>The high-strength Mg-8.5Gd-4Y-1Zn-0.4Zr (wt.%) alloys were fabricated under high extrusion speed (8&#xa0;mm/s). The effects of extrusion speed on the microstructure, texture and mechanical property of the homogenized alloy were studied. As the extrusion speed increases, the stress strain also increases, resulting in an increase in the volume fraction and average size of the DRX grain, and a weakening of the texture. Correspondingly, the ultimate tensile strength (UTS) and yield strength (YS) of the alloy decreased significantly, but the elongation (EL) increased significantly. Subsequently, the effect of centrifugal casting on microstructure and mechanical properties of extruded alloys was studied. Compared with gravity casting alloy, centrifugal casting alloy has higher proportion of Un-DRX grains and smaller DRX grain size after extrusion. Therefore, centrifugal cast alloy has higher comprehensive performance under the same extrusion condition. After the centrifugal casting alloy is extruded at an extrusion speed of 8&#xa0;mm/s, the UTS, YS and EL of the alloy are 381, 324&#xa0;MPa and 10.8%, respectively. Thus, the high strength and toughness Mg-Gd-Y-Zn-Zr extruded alloy can be prepared under high-speed extrusion.</p>

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Achieving High-Strength Mg-Gd-Y-Zn-Zr Alloy under High Extrusion Speed via Composite Forming Process of Centrifugal Casting, Extrusion and Aging

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Zhenduo Ma,
  • Mengmeng Liu,
  • Jingkai Feng,
  • Xin Jia,
  • Zhiwei Yang,
  • Houlong Liu,
  • Mingjia Li,
  • Pengfei Zhang

摘要

The high-strength Mg-8.5Gd-4Y-1Zn-0.4Zr (wt.%) alloys were fabricated under high extrusion speed (8 mm/s). The effects of extrusion speed on the microstructure, texture and mechanical property of the homogenized alloy were studied. As the extrusion speed increases, the stress strain also increases, resulting in an increase in the volume fraction and average size of the DRX grain, and a weakening of the texture. Correspondingly, the ultimate tensile strength (UTS) and yield strength (YS) of the alloy decreased significantly, but the elongation (EL) increased significantly. Subsequently, the effect of centrifugal casting on microstructure and mechanical properties of extruded alloys was studied. Compared with gravity casting alloy, centrifugal casting alloy has higher proportion of Un-DRX grains and smaller DRX grain size after extrusion. Therefore, centrifugal cast alloy has higher comprehensive performance under the same extrusion condition. After the centrifugal casting alloy is extruded at an extrusion speed of 8 mm/s, the UTS, YS and EL of the alloy are 381, 324 MPa and 10.8%, respectively. Thus, the high strength and toughness Mg-Gd-Y-Zn-Zr extruded alloy can be prepared under high-speed extrusion.