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<p>The microstructure, fracture mechanisms, deformation modes, and their correlation with the mechanical properties of Mg-Zn-Gd alloys were analyzed, considering the influence of Y and Nd additions. Increasing Y content and decreasing Nd content resulted in an increase in grain size from 17.2 to 29.2 jim, and two types of LPSO phases, 14H and 18R, formed in the alloy. The mechanical properties of the alloys were predominantly influenced by the LPSO phase, with the grain size effect being relatively minor. Based on this analysis, higher Y and lower Nd contents enhanced the tensile strength, yield strength, and elongation of the alloys, with additional improvements observed following solid solution treatment. Changes in Y and Nd content caused a shift in fracture patterns, transitioning from ductile fracture to brittle fracture and then to mixed fracture. Following solid solution treatment, the alloy progressively transitions from intergranular to a combination of ductile and deconvolutional fracture. The deformation modes observed at each stage are as follows: an increase in LPSO phases and twins activates pyramidal slip and suppresses prismatic slip.</p>

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Influence of Y and Nd on deformation mechanisms and tensile properties at room temperature of Mg-Zn-Gd alloy

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Zhi-qiang Li,
  • He Guo,
  • Wen-xin Hu,
  • Yu-ming Lu,
  • Xin-yuan Wang,
  • Feng Liu,
  • Li-wei Zhang,
  • Wei-li Wang

摘要

The microstructure, fracture mechanisms, deformation modes, and their correlation with the mechanical properties of Mg-Zn-Gd alloys were analyzed, considering the influence of Y and Nd additions. Increasing Y content and decreasing Nd content resulted in an increase in grain size from 17.2 to 29.2 jim, and two types of LPSO phases, 14H and 18R, formed in the alloy. The mechanical properties of the alloys were predominantly influenced by the LPSO phase, with the grain size effect being relatively minor. Based on this analysis, higher Y and lower Nd contents enhanced the tensile strength, yield strength, and elongation of the alloys, with additional improvements observed following solid solution treatment. Changes in Y and Nd content caused a shift in fracture patterns, transitioning from ductile fracture to brittle fracture and then to mixed fracture. Following solid solution treatment, the alloy progressively transitions from intergranular to a combination of ductile and deconvolutional fracture. The deformation modes observed at each stage are as follows: an increase in LPSO phases and twins activates pyramidal slip and suppresses prismatic slip.