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Microstructure and mechanical properties of modified and non-modified stir-cast Al-Si hypoeutectic alloys

Fat-Halla, Nabil ; Secordel, Pascal ; Suery, Michel

Journal of Materials Science, 1988, Vol.23(7), pp.2419-2423 [Tạp chí có phản biện]

ISSN: 0022-2461 ; E-ISSN: 1573-4803 ; DOI: 10.1007/BF01111898

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  • Nhan đề:
    Microstructure and mechanical properties of modified and non-modified stir-cast Al-Si hypoeutectic alloys
  • Tác giả: Fat-Halla, Nabil ; Secordel, Pascal ; Suery, Michel
  • Chủ đề: Specialty Metals Industry -- Analysis ; Specialty Metals Industry -- Mechanical Properties
  • Là 1 phần của: Journal of Materials Science, 1988, Vol.23(7), pp.2419-2423
  • Mô tả: The microstructure and mechanical properties of modified and non-modified stir-cast commercial aluminium alloys A-S7G03 and A-S4G have been investigated. Stir casting of these alloys resulted in spherical and/or rosette shape primary α-phase, and the eutectic silicon was broken into miniature needle morphology. This stir-cast structure slightly improved the mechanical properties in comparison to those of conventionally cast alloys, however the fracture of the stir-cast alloys revealed intergranular brittle fracture. The addition of 0.02% strontium, in the form of Al-5 mass% Sr master alloy, during stir casting modified the eutectic silicon into a very fine spheroidal morphology, while the α-phase particle showed the same morphology as the stir-cast alloys. This novel structure resulted in significant improvement of mechanical properties. The elongation of the modified stir-cast alloys was five times greater than that of the non-modified one. A transgranular mode of fracture was observed for the modified stircast alloys, moreover smooth ripple and dimple patterns were observed reflecting the high ductility of the modified stir-cast alloys.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0022-2461 ; E-ISSN: 1573-4803 ; DOI: 10.1007/BF01111898

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