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<p>In this work, the microstructure and mechanical properties of as-extruded Mg-2Sn-1.8Li-2Al-1Ag-0.5Zn alloy (TLAQZ22211) were investigated, and it is found that the TLAQZ22211 alloy exhibited a bimodal grain structure after hot extrusion processing, with coarse elongated grains parallel to extrusion direction and fine grains surrounded. The yield strength (YS), ultimate tensile strength (UTS), and elongation (EL) of the TLAQZ22211 alloy extruded at 200&#xa0;°C were measured at 295, 343&#xa0;MPa, and 12.5%, respectively. The evolution of microstructure, changes in mechanical properties, and the influence of precipitation phase and dislocation on the properties of the alloy during deformation were discussed. The influence of dislocation-precipitation phase-interface synergistic strengthening effect on mechanical properties was compared and analyzed. The results showed that the high strength was mainly derived from the grain boundaries, nano-precipitations, and residual dislocations. And the good ductility can be attributed to the optimized bimodal grain structure and profuse low-angle grain boundaries (LAGBs) formed inside the elongated grains. The implementation of this work can provide guidance for the design and deformation of lightweight and high-strength magnesium alloys.</p>

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Microstructure and Mechanical Properties of Extruded Mg-2Sn-1.8Li-2Al-1Ag-0.5Zn Alloys

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Zhichao Xu,
  • Yancheng Zhu,
  • Jie Song,
  • Wei Liu,
  • Jingren Li,
  • Hongliang Zhao,
  • Chang Zhu,
  • Hucheng Pan,
  • Gaowu Qin

摘要

In this work, the microstructure and mechanical properties of as-extruded Mg-2Sn-1.8Li-2Al-1Ag-0.5Zn alloy (TLAQZ22211) were investigated, and it is found that the TLAQZ22211 alloy exhibited a bimodal grain structure after hot extrusion processing, with coarse elongated grains parallel to extrusion direction and fine grains surrounded. The yield strength (YS), ultimate tensile strength (UTS), and elongation (EL) of the TLAQZ22211 alloy extruded at 200 °C were measured at 295, 343 MPa, and 12.5%, respectively. The evolution of microstructure, changes in mechanical properties, and the influence of precipitation phase and dislocation on the properties of the alloy during deformation were discussed. The influence of dislocation-precipitation phase-interface synergistic strengthening effect on mechanical properties was compared and analyzed. The results showed that the high strength was mainly derived from the grain boundaries, nano-precipitations, and residual dislocations. And the good ductility can be attributed to the optimized bimodal grain structure and profuse low-angle grain boundaries (LAGBs) formed inside the elongated grains. The implementation of this work can provide guidance for the design and deformation of lightweight and high-strength magnesium alloys.