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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

5 Scopus Citations
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Author(s)

  • Yuan Yu
  • Feng He
  • Zhuhui Qiao
  • Weimin Liu
  • Jun Yang

Detail(s)

Original languageEnglish
Pages (from-to)1376-1385
Journal / PublicationJournal of Alloys and Compounds
Volume775
Early online date13 Oct 2018
Publication statusPublished - 15 Feb 2019
Externally publishedYes

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 CoCrFeNiNb 0.65 and CoCrFeNiNb 0.8 alloys at 800 °C, leading to extremely low wear rate.

Research Area(s)

  • Eutectic high entropy alloy, High temperature, Material structure, Tribological properties, Wear mechanism

Citation Format(s)