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In this study, dry sliding wear of AlSi 0.75 TiMnFeCu x  ( x  = 0, 0.25, 0.5) high-entropy alloy (HEA) produced through mechanical alloying (MA) and spark plasma sintering (SPS) was studied. The microstructure and phase evolution were examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The wear behaviour of HEAs was assessed by reciprocating wear monitor under a dry air atmosphere. The findings demonstrated that AlSi 0.75 TiMnFeCu x  HEAs were multiphase body-centred cubic (BCC/B2) solid solution structured with complex µ-, L 21 , and Laves. It was discovered that the microhardness and wear behaviour of AlSi 0.75 TiMnFeCu x  were comparable to AlSi 0.75 TiMnFe HEA after the addition of Cu up to 0.25 molar ratio. The maximum hardness of the AlCu 0-0.5 FeMnTiSi 0.75  HEAs reached around 1021–1035 HV. The tribology results show that an oxidative wear in AlSi 0.75 TiMnFe while the mixed adhesive-abrasive wear mechanism was prominent in the AlSi 0.75 TiMnFeCu 0.25-0.5  HEAs.

Oxidative and abrasive wear of multiphase AlSi 0.75 TiMnFeCu x ( X = 0, 0.25, 0.5) high entropy alloy under non-lubricating reciprocating motion