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Nanoindentation and Tribology of a (Hf-Ta-zr-nb-ti)c High-Entropy Carbide

Journal of the European Ceramic Society(2021)

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摘要
A (Hf-Ta-Zr-Nb-Ti)C high-entropy carbide was prepared by ball milling and a two-step Spark Plasma Sintering process, achieving a single-phase ceramic sample with a high relative density of 99.4 %. The wear resistance of the sample was measured by tribology and micro-scale mechanical behaviour was studied by nanoindentation on both the non-deformed and worn surfaces. Grains and the vicinity of grain boundaries exhibited high hardness values of 38.5 +/- 0.5 GPa and 35.5 +/- 1.0 GPa with similar Young's moduli of 562 +/- 11 GPa and 547 +/- 16 GPa, respectively. The dominant wear mechanism was mechanical wear with limited grain pull-out and fracture, and with a localized and thin tribo-layer formation. The specific wear rate exhibited an increase with the increasing load from 2.53.10-6 mm3/Nm at 5 N to 9.03.10-6 mm3/Nm at 50 N. This was correlated to the decrease of nanohardness of the worn surfaces with increasing wear load, which is attributed to the increased number of microcracks.
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关键词
High entropy carbide,Nanoindentation,Tribology,Hardness,Wear
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