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Structural modification of Al-Si eutectic alloy by Sr and its effect on tensile and fracture characteristics

Fat-Halla, N.

Journal of Materials Science, 1989, Vol.24(7), pp.2488-2492 [Tạp chí có phản biện]

ISSN: 0022-2461 ; E-ISSN: 1573-4803 ; DOI: 10.1007/BF01174517

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  • Nhan đề:
    Structural modification of Al-Si eutectic alloy by Sr and its effect on tensile and fracture characteristics
  • Tác giả: Fat-Halla, N.
  • Chủ đề: Specialty Metals Industry
  • Là 1 phần của: Journal of Materials Science, 1989, Vol.24(7), pp.2488-2492
  • Mô tả: Modification of the commercial A-S13 alloy and high purity Al-Si eutectic alloy has been successfully achieved using Al-5 Sr master alloy. The refined structure showed more fine and uniformly distributed eutectic silicon in the high purity alloy. The incidence of Al-dendrites due to modification was related to the movement of the eutectic point to the higher-silicon side. The chill-cast alloys showed better refined structure and higher mechanical properties in comparison with the sand-cast alloys. The modified chill-cast alloy exhibited the best mechanical properties. The ultimate. tensile strength of which reached 280 M Pa and the elongation was 9.2%. The fracture patterns changed from well faceted brittle appearance to smooth silky and dimple-like for the normal and modified alloys respectively. This reflects the change from brittle to ductile behaviour after modification. A model for the fracture mechanism was proposed to explain the observed higher ductility for the modified alloy.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0022-2461 ; E-ISSN: 1573-4803 ; DOI: 10.1007/BF01174517

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