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<p>The addition of Mg was intentionally applied in Ni-based superalloy and the effect of Mg on the mechanical and microstructural properties was systematically investigated in this study. It was found that adding small amount of Mg could be beneficial to the mechanical properties. However, the mechanical properties decreased with higher Mg addition, which was due to the variation in the morphology of MC carbides and the number of γ/γ’ eutectics. The spheroidized MC carbides resulted from the small amount of Mg addition could reduce stress concentration, while the increasing number of γ/γ’ eutectic caused by higher addition of Mg would generate more microcracks. The results of experiments and density-functional theory (DFT) calculations show that the addition of magnesium facilitated the nucleation of MC carbides and constrained the growth, resulting in spherical MC carbides. Overall, this study provided a new insight for designing and enhancing the properties of cast superalloys.</p> Graphical Abstract <p></p>

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Effects of Mg Addition on Microstructures and Mechanical Properties in Nickel-Based Cast Superalloys

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Chen Wang,
  • Naicheng Sheng,
  • Shijie Sun,
  • Zhaokuang Chu,
  • Shigang Fan,
  • Guichen Hou,
  • Jinguo Li,
  • Xiaofeng Sun,
  • Yizhou Zhou

摘要

The addition of Mg was intentionally applied in Ni-based superalloy and the effect of Mg on the mechanical and microstructural properties was systematically investigated in this study. It was found that adding small amount of Mg could be beneficial to the mechanical properties. However, the mechanical properties decreased with higher Mg addition, which was due to the variation in the morphology of MC carbides and the number of γ/γ’ eutectics. The spheroidized MC carbides resulted from the small amount of Mg addition could reduce stress concentration, while the increasing number of γ/γ’ eutectic caused by higher addition of Mg would generate more microcracks. The results of experiments and density-functional theory (DFT) calculations show that the addition of magnesium facilitated the nucleation of MC carbides and constrained the growth, resulting in spherical MC carbides. Overall, this study provided a new insight for designing and enhancing the properties of cast superalloys.

Graphical Abstract