Tribological behavior of AlCoCrCuFeNi and AlCoCrFeNiTi0.5 high entropy alloys under hydrogen peroxide solution against different counterparts

Tribological properties of AlCoCrCuFeNi and AlCoCrFeNiTi0.5 alloys under 90% H2O2 solution rubbing against 1Cr18Ni9Ti steel, ZrO2 ceramic and SiC ceramic were investigated. The tribological behavior is dependent on the counterparts and the structure of high entropy alloys. The high entropy alloys exhibit significantly lower friction coefficient and wear loss sliding against SiC ceramic than 1Cr18Ni9Ti steel and ZrO2 ceramic, which can be attributed to the lubricating colloidal film formed by tribo-chemical reaction between H2O2 and SiC Moreover, the AlCoCrFeNiTi0.5/SiC tribo-pair preserves better tribological properties than AlCoCrCuFeNi/SiC tribo-pair, as results of high strength and hardness of AlCoCrFeNiTi0.5 alloy. (C) 2015 Elsevier Ltd. All rights reserved.