粉末冶金Al_(1)Co_(25)Cr_(18)Fe_(23)Ni_(23)Ta_(10)共晶高熵合金摩擦磨损性能研究

Study on Friction and Wear Properties of Powder Metallurgy Al_(1)Co_(25)Cr_(18)Fe_(23)Ni_(23)Ta_(10) Eutectic High Entropy Alloy

共晶高熵合金因其优异的高温性能有望代替传统的高温结构材料,本研究采用粉末热挤压成形成功制备了Al_(1)Co_(25)Cr_(18)Fe_(23)Ni_(23)Ta_(10)共晶高熵合金,对比研究了共晶高熵合金显微组织和力学性能,及其在室温和600℃摩擦磨损性能。研究表明:所制备的粉末冶金共晶高熵合金的显微组织由FCC相与Laves相组成,表面能的降低促进Laves相呈等轴晶,提升了合金的高温力学性能。研究温度下,所得共晶高熵合金摩擦过程十分平稳,摩擦因数为0.35,磨损率均在10-6mm^(3)/(N·m)数量级。共晶高熵合金高温下主要磨损机理为粘着磨损与氧化磨损,高温时共晶高熵合金表面形成了氧化物釉质层,降低了磨损因数与磨损率,提高了合金的耐磨性能。

Due to its excellent high-temperature performance,eutectic high entropy alloy is expected to replace the traditional high-temperature structural materials.In this study,the eutectic high entropy alloy Al_(1)Co_(25)Cr_(18)Fe_(23)Ni_(23)Ta_(10) Ta10 was successfully prepared by powder hot extrusion process.The microstructure and mechanical properties of the eutectic high entropy alloy,as well as the friction and wear properties of the eutectic high entropy alloy at room temperature and 600℃,were compared and studied.The results show that the microstructure of the powder metallurgy eutectic high entropy alloy is composed of the FCC phase and Laves phase.The decrease of surface energy promotes the Laves phase to be an equiaxed crystal,which improves the high-temperature mechanical properties of the alloy.The friction process of the obtained eutectic high entropy alloy is very stable with a friction coefficient of 0.35 and a wear rate in the order of 10-6 mm^(3)/(N·m)at the studied temperature.The main wear mechanism of the eutectic high entropy alloy at high temperature is adhesion wear and oxidation wear.At high temperatures,the oxide enamel layer is formed on the surface of the eutectic high entropy alloy,which reduces the wear factor and wears rate and improves the wear resistance of the alloy.