Abstract High entropy alloys (HEAs) are an important candidate for high temperature mechanical systems. Here, effects of atmosphere, temperature and counterparts on the vacuum tribological behaviors of CoCrFeNi HEA fabricated by spark plasma sintering were systematically studied. Comparison of tribological behaviors in vacuum and air indicated that tribo-oxidation is detrimental to the wear resistance of CoCrFeNi HEA within temperature range 25–400 °C, but positive at 600 and 800 °C. The CoCrFeNi HEA obtains relatively low wear in vacuum when low testing temperatures and heterogeneous counterface are selected. The wear resistance of CoCrFeNi HEA in vacuum is superior or comparable to the steel and intermetallics.

中文翻译：

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CoCrFeNi高熵合金在高温下的真空摩擦学行为

摘要 高熵合金（HEAs）是高温机械系统的重要候选材料。在这里，系统地研究了气氛、温度和对应物对放电等离子烧结制备的 CoCrFeNi HEA 真空摩擦学行为的影响。真空和空气中摩擦学行为的比较表明，摩擦氧化在 25-400 °C 的温度范围内对 CoCrFeNi HEA 的耐磨性有害，但在 600 和 800 °C 的温度范围内是有利的。The CoCrFeNi HEA obtains relatively low wear in vacuum when low testing temperatures and heterogeneous counterface are selected. CoCrFeNi HEA 在真空中的耐磨性优于或可与钢和金属间化合物相媲美。