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<p>The aerospace industry urgently requires high-quality large-sized magnesium (Mg) alloy ingots. However, semi-continuous casting often leads to non-uniformity issues like macro-segregation and inconsistent grain/second-phase sizes, which impair material performance. In this study, 525&#xa0;mm diameter Mg-6Zn-0.6Zr-RE alloy ingots were fabricated via electromagnetic semi-continuous casting to systematically investigate composition, microstructure, and mechanical properties. The results indicate that the contents of Zn and RE progressively rise from the center to the edge of the ingot, while the trend of Zr content is the contrary. The grain size distribution of <i>α</i>-Mg is typically R/2 &gt; center &gt; edge. Simultaneously, the size of the second phase is gradually refined from the center to the edge. The Weibull statistical model was applied to evaluate the mechanical properties of the samples from different locations. The increased values of the Weibull characteristic parameter indicate an improvement in the mechanical properties from the center to the edge. The enhanced microstructural uniformity is found to be responsible for the modification of the mechanical properties and the variation of the characteristic parameters in the Weibull statistical distribution. These findings provide critical insights into optimizing solidification parameters for high-quality Mg alloy ingots in aerospace applications.</p>

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Homogeneity Analysis of Large-Sized Magnesium Alloy Ingots Produced by Electromagnetic Semi-Continuous Casting Based on the Weibull Statistical Model

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Gang Zeng,
  • Hong Liu,
  • Jianlong Li,
  • Xiaozhen Deng,
  • Zhibiao Li,
  • Gang Tang

摘要

The aerospace industry urgently requires high-quality large-sized magnesium (Mg) alloy ingots. However, semi-continuous casting often leads to non-uniformity issues like macro-segregation and inconsistent grain/second-phase sizes, which impair material performance. In this study, 525 mm diameter Mg-6Zn-0.6Zr-RE alloy ingots were fabricated via electromagnetic semi-continuous casting to systematically investigate composition, microstructure, and mechanical properties. The results indicate that the contents of Zn and RE progressively rise from the center to the edge of the ingot, while the trend of Zr content is the contrary. The grain size distribution of α-Mg is typically R/2 > center > edge. Simultaneously, the size of the second phase is gradually refined from the center to the edge. The Weibull statistical model was applied to evaluate the mechanical properties of the samples from different locations. The increased values of the Weibull characteristic parameter indicate an improvement in the mechanical properties from the center to the edge. The enhanced microstructural uniformity is found to be responsible for the modification of the mechanical properties and the variation of the characteristic parameters in the Weibull statistical distribution. These findings provide critical insights into optimizing solidification parameters for high-quality Mg alloy ingots in aerospace applications.