Study of the Interface of AI-7Si-10 vol. SiC_p cast Composites Treated with Sr

摘要

Effects of additions of Sr (in the range 0.05 to 0.5%) on the microstructural characteristics of the Al-7wt% Si-10 vol.% SiC_p composites have been studied. Optical Microscopy (OM), SEM, EDS, WDS microanalysis techniques and X-ray diffraction, powder techniques have been used for characterization of the composites. It was found that Sr concentrations between 0.05 to 0.20 facilitates incorporation of higher volume fraction of SiC particles and also does not contribute to the over modification of the matrix. However, higher wt% of Sr, Sr-rich compounds were found. These Strontium rich compounds were located at the matrix-ceramic interface.