The effect of B4C particle contents on hardness and wear resistance of Al-SiC-B4C composite formatted on AA332 via GTAW process

One of the mechanisms of degradation of the wear parts is considered. In this study, Al-SiC-B4C composite with B4C various rate prepared on surface of AA332 alloy. For make surface composite, all the samples were surface melted. Microstructural investigation with optical and electron microscope shows, SiC and B4C placed in proximity to the grain boundaries. Increasing of B4C content is cause of increase tendency formation of Al3B4C and Al4C3 phases. Hardness of composite layer increase up to 182 HV has more than doubling the number. Unlike the hardness, wear resistance with increasing B4C showed different behavior. The results of Pin on disk wear test showed that B4C in each case leads to a decrease in the rate of wear. But after 1000 meters, the wear rate increased with increasing B4C. Check of the worn surfaces by SEM showed that the wear mechanism from adhesion to abrasive with increasing B4C changes.