Self-lubricating behavior of Fe22Co26Cr20Ni22Ta10 high-entropy alloy matrix composites |
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Authors: | Wei-cheng XIAO Kun LI Liu-liu HAN Yong LIU |
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Affiliation: | State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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Abstract: | Eutectic high entropy alloys (EHEAs) have high temperature stability, good mechanical properties, and are promising for tribological applications at high temperatures. To study the high temperature lubrication behavior, Fe22Co26Cr20Ni22Ta10?(BaF2/CaF2)x (x=3?20, wt.%) composites were prepared by spark plasma sintering (SPS), with BaF2/CaF2 eutectic powder used as solid lubricant. The lubrication behavior and mechanical properties were studied at both room and high temperatures. With the increase of the content of BaF2/CaF2 eutectic powder, the friction coefficients and the wear rates of the composites at 600 and 800 °C decrease significantly. The composites with eutectic powder content of 15 and 20 wt.% have the best lubricating performance at 600 °C, with low friction coefficient and wear rates, mainly due to the good mechanical properties of EHEA matrix, the lubrication effect of BaF2/CaF2 phase and the oxides formed on the worn surface. |
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Keywords: | eutectic high entropy alloy self-lubricating composite tribological properties microstructure |
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