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<p>The regulation of the microstructure in as-cast dual-phase Mg-Li alloy through heat treatment not only enables the attainment of superior mechanical properties but also facilitates the preparation of the microstructure for subsequent severe plastic deformation. In the study, the microstructure of the Mg-7Li-6Al-2Ca-0.5Mn (LACX7620) alloy was examined using scanning electron microscopy (SEM), x-ray diffraction (XRD), and energy dispersive spectroscopy (EDS). The analysis revealed the presence of several phases in the as-cast alloy: α-Mg, β-Li, Al<sub>2</sub>Ca, AlLi, MgAlLi<sub>2</sub>, and Al-Mn (<i>W</i> phase). After solution treatment at 200&#xa0;°C for 2&#xa0;hours, the AlLi and MgAlLi<sub>2</sub> phases in the alloy migrated toward the grain boundaries, resulting in a more uniform microstructure. Compared to other heat treatment methods, the alloy exhibited a remarkable increase in tensile strength, rising from 71.74 to 155.05&#xa0;MPa, a 116% improvement. Yield strength also increased significantly, from 67.27 to 124.12&#xa0;MPa, corresponding to an 84% increase. Additionally, elongation was notably enhanced. The optimal phase stability and strength were achieved through solid solution treatment at 200&#xa0;°C for 2&#xa0;hours.</p>

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Effect of Heat Treatment on the Microstructure and Mechanical Properties of Dual-Phase Mg-Li-Al-Ca-Mn Alloy

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Haolong Luo,
  • Xianzhe Shi,
  • Ziyu Li,
  • Zhifu Wang,
  • Lili Ma,
  • Zhonghao Heng

摘要

The regulation of the microstructure in as-cast dual-phase Mg-Li alloy through heat treatment not only enables the attainment of superior mechanical properties but also facilitates the preparation of the microstructure for subsequent severe plastic deformation. In the study, the microstructure of the Mg-7Li-6Al-2Ca-0.5Mn (LACX7620) alloy was examined using scanning electron microscopy (SEM), x-ray diffraction (XRD), and energy dispersive spectroscopy (EDS). The analysis revealed the presence of several phases in the as-cast alloy: α-Mg, β-Li, Al2Ca, AlLi, MgAlLi2, and Al-Mn (W phase). After solution treatment at 200 °C for 2 hours, the AlLi and MgAlLi2 phases in the alloy migrated toward the grain boundaries, resulting in a more uniform microstructure. Compared to other heat treatment methods, the alloy exhibited a remarkable increase in tensile strength, rising from 71.74 to 155.05 MPa, a 116% improvement. Yield strength also increased significantly, from 67.27 to 124.12 MPa, corresponding to an 84% increase. Additionally, elongation was notably enhanced. The optimal phase stability and strength were achieved through solid solution treatment at 200 °C for 2 hours.