Abstract
The interfaces of aluminum alloy composites (5083) reinforced by SiC particles (as-received, oxidized 3.04 wt pct and 14.06 wt pct) were studied. The composites were fabricated by compocasting and certain samples were also remelted at 800 °C for 30 minutes. The reaction mechanisms between SiC p and liquid Al and between the SiO2 layer and Al(Mg) are discussed. The crystal boundaries of the MgO (or MgAl2O4) reaction products are believed to be the diffusion paths (or channels) during the interfacial reactions. A SiO2 layer, formed by oxidation of the SiC particles prior to their incorporation into the melt, plays an important role in preventing the SiC p from being attacked by the matrix. The interfacial reaction products are affected by both the alloy composition and the thickness of the initial SiO2 layer.
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Zhong, W.M., L’Espérance, G. & Suéry, M. Interfacial Reactions in Al-Mg (5083)/SiCp Composites during Fabrication and Remelting. Metall Mater Trans A 26, 2637–2649 (1995). https://doi.org/10.1007/BF02669421
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DOI: https://doi.org/10.1007/BF02669421