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<p>Iron impurity in Al-Si alloys promotes the formation of plate-like β-Fe-rich intermetallics, while the presence of 0.1wt.% Mo-refined plate-like intermetallic phases occurs without significantly changeing their morphology. The present work deals with the influence of strontium (Sr) on the morphological changes in the Fe-rich phases in the recycled alloys (Mo modified). Solidification kinetics and microstructural analysis using computer-aided cooling curve analysis (CACCA), SEM-EDS, STEM and XRD, respectively, reveal a catalytic role of Sr in promoting the evolution of α-Al<sub>8</sub>(FeMo)Si phases over β-Al<sub>5</sub>FeSi-phases. Sr addition shows significant refinement in eutectic-Si and β-Fe phases and promotes the nucleation of Chinese-script α-Fe-rich phases in the recycled alloys.</p>

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Catalytic-Role of Sr on the Evolution of Fe-rich Phases in Recycled Al-Si-Fe Alloys

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • M. Kishor,
  • P. Kaushik,
  • A. K. Ramavajjala,
  • S. A. G. Nahid,
  • V. K. Modalavalasa,
  • S. R. Gorja,
  • A. K. Prasada Rao

摘要

Iron impurity in Al-Si alloys promotes the formation of plate-like β-Fe-rich intermetallics, while the presence of 0.1wt.% Mo-refined plate-like intermetallic phases occurs without significantly changeing their morphology. The present work deals with the influence of strontium (Sr) on the morphological changes in the Fe-rich phases in the recycled alloys (Mo modified). Solidification kinetics and microstructural analysis using computer-aided cooling curve analysis (CACCA), SEM-EDS, STEM and XRD, respectively, reveal a catalytic role of Sr in promoting the evolution of α-Al8(FeMo)Si phases over β-Al5FeSi-phases. Sr addition shows significant refinement in eutectic-Si and β-Fe phases and promotes the nucleation of Chinese-script α-Fe-rich phases in the recycled alloys.