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<p>In this study, the low-cost Mg-Ca binary alloy and also the Mg-Zn-Ca ternary alloy were developed, and the high strength of &gt; 250 MPa and high ductility of &gt; 10% are obtained via the conventional extrusion processing. For the typical Mg-0.4 Ca binary alloy (wt.%, named as X4 sample), the as-extruded sample exhibits yield strength (YS) of 293 MPa, ultimate tensile strength (UTS) of 298&#xa0;MPa and elongation (EL) of 15.9%. For the typical Mg-1.0Zn-0.4Ca ternary alloy (wt.%, named as ZX10 sample), the as-extruded sample exhibits an optimal combination of mechanical properties: with YS of 260&#xa0;MPa, UTS of 286&#xa0;MPa, and EL of 24.1%. Microstructural analysis indicates that all the as-extruded alloys exhibit a typical bimodal microstructure. Compared with the un-dynamic-recrystallized (un-DRXed) regions, the dynamic-recrystallized (DRXed) regions show a weaker texture and higher basal-slip Schmid factors. All the as-extruded alloys contain abundant micron- and nano-sized Mg₂Ca phases. In addition, the Ca<sub>2</sub>Mg<sub>6</sub>Zn<sub>2</sub> phase was identified in the as-extruded ZX10 sample, and its recrystallization fraction increased to ~ 60.9%. The superior strength-ductility synergy in the as-extruded ZX10 sample is attributed to the enhancement in recrystallization fraction, together with grain refinement, precipitation strengthening, and texture modification. This study provides valuable insights into microstructural control strategies for achieving high strength-ductility synergy in low-cost biomedical magnesium alloys.</p>

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Effect of Extrusion on Microstructures and Mechanical Properties of Mg-Ca and Mg-Zn-Ca Alloys

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Shengxuan Xu,
  • Xiaonan Cui,
  • Hucheng Pan,
  • Zhihao Zeng,
  • Zhilei Li,
  • Xiangzhong Zhao,
  • Gaowu Qin

摘要

In this study, the low-cost Mg-Ca binary alloy and also the Mg-Zn-Ca ternary alloy were developed, and the high strength of > 250 MPa and high ductility of > 10% are obtained via the conventional extrusion processing. For the typical Mg-0.4 Ca binary alloy (wt.%, named as X4 sample), the as-extruded sample exhibits yield strength (YS) of 293 MPa, ultimate tensile strength (UTS) of 298 MPa and elongation (EL) of 15.9%. For the typical Mg-1.0Zn-0.4Ca ternary alloy (wt.%, named as ZX10 sample), the as-extruded sample exhibits an optimal combination of mechanical properties: with YS of 260 MPa, UTS of 286 MPa, and EL of 24.1%. Microstructural analysis indicates that all the as-extruded alloys exhibit a typical bimodal microstructure. Compared with the un-dynamic-recrystallized (un-DRXed) regions, the dynamic-recrystallized (DRXed) regions show a weaker texture and higher basal-slip Schmid factors. All the as-extruded alloys contain abundant micron- and nano-sized Mg₂Ca phases. In addition, the Ca2Mg6Zn2 phase was identified in the as-extruded ZX10 sample, and its recrystallization fraction increased to ~ 60.9%. The superior strength-ductility synergy in the as-extruded ZX10 sample is attributed to the enhancement in recrystallization fraction, together with grain refinement, precipitation strengthening, and texture modification. This study provides valuable insights into microstructural control strategies for achieving high strength-ductility synergy in low-cost biomedical magnesium alloys.