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<p>Improving the extrusion speed of Mg alloys is crucial for expanding their applications. Commercial AZ80 alloy exhibits favorable comprehensive mechanical properties but poor high-speed extrudability. In this study, an Mg-7.5Al-0.3Zn-0.8Ca-0.3Mn-0.3Y (AZXMW80100, wt%) alloy with outstanding high-speed extrudability was developed through minor Ca and Y alloying into AZ80 alloy. The as-extruded AZXMW80100 alloy features a completely dynamic recrystallized microstructure with an average grain size of ~ 8.1&#xa0;μm, reinforced by a significant volume of thermally stable Al<sub>2</sub>Ca, Al<sub>8</sub>Mn<sub>4</sub>Y, and Al<sub>2</sub>Y particles. The refined grain structure contributes to substantial strengthening and effectively suppresses the activation of compression twins and double twins during deformation. As a result, the high-speed extruded AZXMW80100 alloy shows good comprehensive mechanical properties, achieving a yield strength of 253.4 ± 5.3&#xa0;MPa and an elongation of 15.3 ± 2.2%. Owing to its superior extrudability and excellent mechanical performance, the AZXMW80100 alloy holds significant potential for the efficient manufacturing of lightweight structural components via high-speed extrusion and offers valuable insights for the design and development of fast extrudable high-alloyed Mg alloys.</p>

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Achieving excellent high-speed extrudability and a well-balanced strength–ductility synergy in a Mg-7.5Al-0.3Zn-0.8Ca-0.3Mn-0.3Y alloy

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Shuai-ju Meng,
  • Ke-yi Chen,
  • Sheng Wang,
  • Ya-meng Shi,
  • Jia-rong Wu,
  • Gui-rong Yang

摘要

Improving the extrusion speed of Mg alloys is crucial for expanding their applications. Commercial AZ80 alloy exhibits favorable comprehensive mechanical properties but poor high-speed extrudability. In this study, an Mg-7.5Al-0.3Zn-0.8Ca-0.3Mn-0.3Y (AZXMW80100, wt%) alloy with outstanding high-speed extrudability was developed through minor Ca and Y alloying into AZ80 alloy. The as-extruded AZXMW80100 alloy features a completely dynamic recrystallized microstructure with an average grain size of ~ 8.1 μm, reinforced by a significant volume of thermally stable Al2Ca, Al8Mn4Y, and Al2Y particles. The refined grain structure contributes to substantial strengthening and effectively suppresses the activation of compression twins and double twins during deformation. As a result, the high-speed extruded AZXMW80100 alloy shows good comprehensive mechanical properties, achieving a yield strength of 253.4 ± 5.3 MPa and an elongation of 15.3 ± 2.2%. Owing to its superior extrudability and excellent mechanical performance, the AZXMW80100 alloy holds significant potential for the efficient manufacturing of lightweight structural components via high-speed extrusion and offers valuable insights for the design and development of fast extrudable high-alloyed Mg alloys.