Optimization of wear and friction behaviour of AZ91D –B₄C − Gr hybrid composite under dry sliding conditions

Abstract

The tribological behaviour of AZ91D magnesium alloy bottom pouring stir cast with boron carbide (B4C) and graphite (Gr) was examined. The wear and frictional properties of AZ91D magnesium alloy, AZ91D-B4C composite, and AZ91D-B4C-Gr hybrid composite were investigated individually under dry sliding circumstances. To perform the studies, the L9 orthogonal array approach was adopted to investigate the effects of various sliding distances (0.5, 1, and 2 km) and applied load (5, 10 and 20N). When compared to AZ91D magnesium alloy and AZ91D- B4C composite, the wear loss for the AZ91D- B4C-Gr hybrid composite were reduced by 52.2% and 17.76% respectively at maximum load (20N) and sliding distance (2 km). Compared to AZ91D magnesium alloy, the hybrid composite had a higher hardness. SEM analysis of worn surfaces was performed to determine the significant abrasive wear process. The critical factors affecting the wear losses were generated using analysis of variance (ANOVA).

Tribological aspects of magnesium matrix composites: A review of recent experimental studies

“…They reported that the wear rate of samples increased from load of 10 to load of 60N. Murugesan et al [58] investigated the wear performance of AZ91/B 4 C-Gr composite and reported that the wear loss increased with increasing load. Ataya et al [64] investigated the wear behaviour of AZ91/SCF composites produced by squeeze casting.…”

“…They reported that the asperities on the mating surfaces deformed with increasing load, causing to decrease in COF. Murugesan et al [58] investigated the effect of load and particle content on the COF values of the AZ91/B 4 C composites. They reported the COF decreased with increasing load.…”