Abstract
Room-temperature (RT) dry sliding tribological behavior of CoCrFeNiMn high-entropy alloy (HEA) against 304 stainless steel (304), alumina (Al2O3) and silicon nitride (Si3N4) counterparts, and particularly the comparative 304/Al2O3 and 304/Si3N4 tribo-pairs were investigated. The HEA/304, HEA/Al2O3 and 304/Al2O3 tribo-pairs exhibit distinctly lower friction coefficient (μ) than HEA/Si3N4 and 304/Si3N4 tribo-pairs, while the trend of wear rate (W) is opposite. The similar structure of HEA and 304 leads to high mutual solubility and easy adhesion of the tribo-pair. Si3N4 has higher fracture toughness and lower hardness than Al2O3 ceramics and has better wear resistance. Therefore, the main wear mechanism of HEA or 304 was abrasive wear and adhesive wear when sliding against Al2O3, but oxidative wear and diffusion wear when sliding against Si3N4. Moreover, the HEA presents better tribological properties than 304 in terms of the wear rate of the disk and the counterpart when sliding against Si3N4, which can be attributed to the formation of more lubricating oxides induced by the tribo-chemical reaction such as Cr2O3, MnO2 and transfer layer SiOx on the worn surface.
Published Version
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