Abstract
In this study, microstructure analysis, yield strength at high temperatures and wear rate of hybrid A359/(SiC + Si3N4) composites were investigated. Different weight percent of (SiC + Si3N4) particles were introduced to synthesis the composites using stir/squeeze process. XRD, SEM, TEM and EDS were utilized to investigate the distribution of particles throughout the matrix, and the interfacial reaction at matrix/particle interface. It confirmed the existence of MgAl2O4 which enhances the wettability between the particles and the matrix, and the absence of particle agglomeration. The (SiC + Si3N4) addition not only enhances the hardness measurements but also leads to a reduction in the dendritic arm spacing (DAS). Moreover, it develops the wear performance and the yield strength at high temperatures. The developed composites provide a promising material suitable for automotive industries.
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