Investigation of high temperature tribological performance of TiZrV0.5Nb0.5 refractory high-entropy alloy optimized by Si microalloying
Tribology International(2022)
摘要
Effect of Si addition on the high temperature tribological properties of TiZrV0.5Nb0.5 refractory high entropy alloy was systematically studied. The results demonstrate that Si-microalloying affects the tribological properties by modulating the evolution of tribo-layer. Si-microalloying produces local tribo-layer with strong wear resistance by increasing the sintering rate of wear debris below 600 ℃, ultimately significantly reducing the coefficient of friction and wear rate. At 600 °C, Si-microalloying deteriorates the wear resistance due to the stress concentration at hard particles leading to accelerated fracture of the tribo-layer which hinders the formation of continuous protective tribo-layer. The enhanced tribological properties at 800 °C are attributed to the synergistic effect of suppressed oxide volatilization and rapid oxidation behavior ensuring continuous dense tribo-layer formation.
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关键词
Refractory high entropy alloy,tribo-layer,Si-microalloying,high temperature
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