Effects of temperature and microstructure on the triblogical properties of CoCrFeNiNbx eutectic high entropy alloys

By Yuan Yu, F. He, Zhuhui Qiao, Zhijun Wang, Wei-min Liu, Jun Yang. Journal of Alloys and Compounds, 2019

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Abstract This paper is aimed to evaluate the high temperature tribological behaviors of CoCrFeNiNbx eutectic high entropy alloys which would be highly-promising candidates for high-temperature applications. The effects of testing temperature and material structure on the friction and wear properties are investigated. The CoCrFeNiNbx alloys display a low harness decrement rate about 35% from room temperature to 1000 °C, indicating good softening resistance. The main wear mechanisms are abrasion wear at room temperature, change to adhesion wear at 400 °C, and translate into oxidation wear and mechanical wear over 600 °C. The wear rates increase from room temperature to 400 °C and decrease afterwards. The effects of material structure are dominated by the hardness of alloy, the content of chemically active Nb element and the structure of oxidized tribo-layer. The compact oxidized tribo-layers with excellent anti-wear properties are formed on the worn surface of CoCrFeNiNb0.65 and CoCrFeNiNb0.8 alloys at 800 °C, leading to extremely low wear rate.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/a7e9fa6cf9b0bc78473762b8938360ba432bcc83