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<p>Strontium (Sr) additions play a key role in enhancing the mechanical properties of Al–Si–Fe alloys by refining eutectic silicon and plate-like β-Al<sub>5</sub>FeSi phases. The present study investigates the influence of Sr additions on the microstructural and mechanical properties of recycled Al–Si–Fe–Mo alloys. The focus is primarily on understanding Sr’s influence on the formation and evolution of Fe-rich phases in these recycled alloys alongside mechanical properties. Sr additions promote the nucleation and growth of α-Fe-rich phases in the recycled alloys. In addition, morphological transformations from plate-like intermetallic phases to Chinese script structures are observed with micro additions of Mo and Sr. Developed alloys were tested for hardness and tensile strength, and results revealed that Sr improved the ultimate tensile strength (UTS) (141.49 MPa) and tensile strain (9.6%) of the recycled alloys through enhanced modification of β-Al<sub>5</sub>FeSi into α-Al<sub>8</sub>(FeMo)Si phases. Overall, the study defines a new strategy to improve the mechanical properties of impurity-tolerant recycled alloys.</p>

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Design Strategy for Improving Mechanical Performance of Impurity-Tolerant Al–Si–Fe Alloys

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Kishor Modalavalasa,
  • Paras Kaushik,
  • Ansar Ghousiya Nahid Shaik,
  • Venkatasailakshmi Yelaka,
  • Anil Kumar Ramavajjala,
  • Nanda Kishore Karnam,
  • Kameswari Prasada Rao Ayyagari

摘要

Strontium (Sr) additions play a key role in enhancing the mechanical properties of Al–Si–Fe alloys by refining eutectic silicon and plate-like β-Al5FeSi phases. The present study investigates the influence of Sr additions on the microstructural and mechanical properties of recycled Al–Si–Fe–Mo alloys. The focus is primarily on understanding Sr’s influence on the formation and evolution of Fe-rich phases in these recycled alloys alongside mechanical properties. Sr additions promote the nucleation and growth of α-Fe-rich phases in the recycled alloys. In addition, morphological transformations from plate-like intermetallic phases to Chinese script structures are observed with micro additions of Mo and Sr. Developed alloys were tested for hardness and tensile strength, and results revealed that Sr improved the ultimate tensile strength (UTS) (141.49 MPa) and tensile strain (9.6%) of the recycled alloys through enhanced modification of β-Al5FeSi into α-Al8(FeMo)Si phases. Overall, the study defines a new strategy to improve the mechanical properties of impurity-tolerant recycled alloys.