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<p>Magnesium (Mg) is the lightest structural metal. It is promising for aerospace applications if its mechanical properties can be improved at a reasonable cost, without using expensive alloying elements or time-consuming processing routes. Here, we develop a rare-earth free Mg-Al-Ca alloy, processed through rotary swaging followed by flash annealing. The resulting alloy exhibits superior strength and ductility, surpassing nearly all reported rare-earth free magnesium alloys. Nanosized Al-Ca precipitates and clusters, formed largely during rotary swaging and flash annealing, significantly strengthen the alloy. Deformation twinning is suppressed, necessitating the formation of more &lt;c + a&gt; dislocations to accommodate the severe plastic strain induced by rotary swaging. These &lt;c + a&gt; dislocations are retained during flash annealing due to the high climb energy barrier and pinning by those nanosized Al-Ca precipitates and clusters. This retention of &lt;c + a&gt; dislocations contributes to high ductility and provides forest hardening, further increasing strength. This study offers a simple strategy for designing and fabricating high-performance magnesium alloys.</p>

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High strength and ductility in a rare-earth free magnesium alloy processed by rotary swaging and flash annealing

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月10日

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  • Yunhao Fan,
  • Yaofeng Li,
  • Hui Guo,
  • Gaoming Zhu,
  • Boyu Liu,
  • Hao Wang,
  • Hao Zhou,
  • Yuling Xu,
  • Xiaoqin Zeng,
  • Leyun Wang

摘要

Magnesium (Mg) is the lightest structural metal. It is promising for aerospace applications if its mechanical properties can be improved at a reasonable cost, without using expensive alloying elements or time-consuming processing routes. Here, we develop a rare-earth free Mg-Al-Ca alloy, processed through rotary swaging followed by flash annealing. The resulting alloy exhibits superior strength and ductility, surpassing nearly all reported rare-earth free magnesium alloys. Nanosized Al-Ca precipitates and clusters, formed largely during rotary swaging and flash annealing, significantly strengthen the alloy. Deformation twinning is suppressed, necessitating the formation of more <c + a> dislocations to accommodate the severe plastic strain induced by rotary swaging. These <c + a> dislocations are retained during flash annealing due to the high climb energy barrier and pinning by those nanosized Al-Ca precipitates and clusters. This retention of <c + a> dislocations contributes to high ductility and provides forest hardening, further increasing strength. This study offers a simple strategy for designing and fabricating high-performance magnesium alloys.