Microstructure, mechanical and tribological properties of CoCrFeNiMn high entropy alloy matrix composites with addition of Cr3C2

摘要

CoCrFeNiMn high-entropy alloy (HEA) matrix composites with different mass fraction of Cr3C2 are produced by spark plasma sintering. The composites are composed of HEA's face-centered-cubic and Cr7C3 phases. When addition of Cr3C2 increases, the hardness and yield strength of composites increase. The friction coefficients at room temperature (RT), 200 and 800 degrees C exhibit a decreasing tendency with the increase of Cr3C2 content. The wear rates decrease from RT to 800 degrees C when adding 10% Cr3C2 in CoCrFeNiMn HEA. The wear mechanisms of CoCrFeNiMn HEA matrix composites are governed by abrasion and adhesive wear from RT to 400 degrees C, and change to oxidation wear above 400 degrees C. Combined the mechanical and tribological properties, CoCrFeNiMn-10% Cr3C2 composite possesses the best comprehensive properties.