Wear Analysis of Friction Stir Processed AA7075-SiC-Graphite Hybrid Surface Composites

High specific strength and superior corrosion resistance are two key characteristics of the aerospace grade AA7075-T6 alloy. However, surface behavior is found to be deprived, because its being prone fretting fatigue adhesive wear under dry sliding conditions. Thus, improvement with retention microhardness alloy required for increasing wider application. For this, isomorphous precipitates soft matrix need protected through dispersion hard thermally stable ceramic SiC solid-lubricant graphite particles. The friction stir processing (FSP) avoids detrimental phase formations by metal below melting point temperature. SiC-Graphite inside using FSP focal study. low high rate samples have been analyzed SEM imaging elemental analysis XRD EDS mapping. In this study, reinforcing SiC-Gr particles greatly improved AA7075 Wear has controlled combining solid lubricant Gr load-bearing nanoparticles. action, base was severely exposed wear, but nanoparticles served as asperities resistance. Simultaneously, layers generated lubricating tribofilm further reduce between mating surfaces. mechanisms changed prominently from adhesion abrasion delamination reinforcements. content in a hybrid ratio 78%. tendency more effectively composites compared