Herein, the effects of Zn/Y and Zn/Gd addition on microstructural evolution and mechanical properties of the superlight Mg–14Li‐based alloy are investigated. The results show that Mg–14Li‐based alloys are characterized by predominantly single β‐Li phase. Zn/Y addition leads to the introduction of homogeneous distribution of Mg₃Zn₃Y₂ (W phase), Mg₂Zn₁₁, and MgLiZn phases. With the strengthening effect of grain refinement and a large number of precipitates, the mechanical properties of Mg–14Li‐based alloy are improved, whereas MgGd₃, MgGd, Mg₂Zn₁₁, and GdZn₅ phases appear with the addition of Zn/Gd, which enhance the Mg–14Li‐based alloy significantly due to grain refinement strengthening, the second phase strengthening, and solid solution strengthening. After hot extrusion, dynamic recrystallization (DRX) significantly refines β‐Li into equiaxed grains, and broken precipitated phases are distributed along the extrusion direction. Mechanical properties of those alloys are improved because of grain refinement and distributed precipitates.

中文翻译：

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Zn / Y和Zn / Gd不同的铸态和挤压态Mg-14Li合金的组织演变和力学性能

在此，研究了Zn / Y和Zn / Gd的添加对超轻Mg-14Li基合金的组织演变和力学性能的影响。结果表明，Mg-14Li基合金的特征在于主要为单一的β -Li相。添加Zn / Y导致引入Mg ₃ Zn ₃ Y ₂（W相），Mg ₂ Zn ₁₁和MgLiZn相的均匀分布。通过晶粒细化和大量析出物的强化作用，Mg-14Li基合金的机械性能得到改善，而MgGd ₃，MgGd，Mg ₂ Zn ₁₁和GdZn ₅Zn / Gd的添加会出现两相，这是由于晶粒细化强化，第二相强化和固溶强化而显着增强了Mg-14Li基合金。热挤压后，动态再结晶（DRX）显著细化β -Li成等轴晶粒，并且破碎的析出相沿挤压方向分布。由于晶粒细化和沉淀物的分布，这些合金的机械性能得到了改善。