Abstract
Transmission (TEM) and scanning electron microscopy (SEM) are employed to study the SiC/Al-alloy interface in a cast SiCp/Al(A356) metal matrix composite (MMC). Magnesium aluminate (spinel), MgAl2O4, was found at the interface as a reaction product after material processing. Comparisons of the crystal structure, structure factor, and interface reaction ther-modynamics between MgAl2O4 and MgO have been carried out. The results from these com-parisons confirm the experimental observation;i.e., the favored interface phase is magnesium aluminate (spinel). Based on the thermodynamic analysis, the presence of oxygen in various forms in the system during processing, such as SiO2, A12O3, and MgO, is believed to be the source which supplies the oxygen for the formation of MgAl2O4.
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Wang, N., Wang, Z. & Weatherly, G.C. Formation of magnesium aluminate (spinel) in cast SiC particulate-reinforced Al(A356) metal matrix composites. Metall Trans A 23, 1423–1430 (1992). https://doi.org/10.1007/BF02647325
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DOI: https://doi.org/10.1007/BF02647325