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

Abstract

In this study, dry sliding wear of AlSi_0.75TiMnFeCu_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_0.75TiMnFeCu_x HEAs were multiphase body-centred cubic (BCC/B2) solid solution structured with complex µ-, L₂₁, and Laves. It was discovered that the microhardness and wear behaviour of AlSi_0.75TiMnFeCu_x were comparable to AlSi_0.75TiMnFe HEA after the addition of Cu up to 0.25 molar ratio. The maximum hardness of the AlCu_0-0.5FeMnTiSi_0.75 HEAs reached around 1021–1035 HV. The tribology results show that an oxidative wear in AlSi_0.75TiMnFe while the mixed adhesive-abrasive wear mechanism was prominent in the AlSi_0.75TiMnFeCu_0.25-0.5 HEAs.