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The effects of magnesium additions on the structure and properties of Al-7 Si-10 SiC p composites

Sukumaran, K. ; Pillai, S. ; Pillai, R. ; Kelukutty, V. ; Pai, B. ; Satyanarayana, K. ; Ravikumar, K.

Journal of Materials Science, 1995, Vol.30(6), pp.1469-1472 [Tạp chí có phản biện]

ISSN: 0022-2461 ; E-ISSN: 1573-4803 ; DOI: 10.1007/BF00375250

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  • Nhan đề:
    The effects of magnesium additions on the structure and properties of Al-7 Si-10 SiC p composites
  • Tác giả: Sukumaran, K. ; Pillai, S. ; Pillai, R. ; Kelukutty, V. ; Pai, B. ; Satyanarayana, K. ; Ravikumar, K.
  • Chủ đề: Aluminum Base Alloys ; Composite Materials ; Silicon Carbide ; Silicon ; Alloying Elements ; Magnesium ; Particulate Composites ; Microstructure ; Wetting ; Alloying Effects ; Tensile Strength ; Porosity ; Al Si Mg Alloys ; Composites (MD) ; Constitution/Crystal Structure/Microstructure (AI) ; Article ; AL, Aluminum Base Alloys ; A356 AL Aluminum Base Alloys
  • Là 1 phần của: Journal of Materials Science, 1995, Vol.30(6), pp.1469-1472
  • Mô tả: The additions of magnesium to an aluminium alloy matrix, which contains insufficient magnesium, was found to be essential during the synthesis of composites by the stir-casting technique. Magnesium promotes interfacial wetting between the dispersoid surface and the matrix. Dispersion of SiC p in Al-7 Si-0.3 Mg (356) alloy matrix without agglomeration and rejection was not possible. Hence, the addition of up to 3 wt% Mg was made to the alloy matrix during the dispersion of 10 wt% SiC p (34 Μm), and the microstructure and mechanical properties of the composites were investigated with a view to optimize the magnesium content. With a magnesium content less than 1 wt% in the matrix, the SiC p particles were essentially in agglomerated form. The highest UTS of 280–300 MPa was obtained with 1 wt% Mg content and SiC p was uniformly distributed in the matrix. A higher magnesium content (>1.0 wt%) did not further improve the uniformity in the dispersion of SiC p but the ultimate tensile strength properties deteriorated. This decrease in strength was attributed to the observed coarseness of the Mg 2 Si phase, the precipitation of Mg 5 Al 8 phase and the presence of a higher amount of porosity in the composites in the heat-treated condition. The aspect ratio (length/width) of precipitates changed from 1–3 for 1% Mg to 3–9 for 3.2% Mg in the matrix. Corresponding values for per cent porosity were 2% and 6%, respectively.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0022-2461 ; E-ISSN: 1573-4803 ; DOI: 10.1007/BF00375250

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