Microstructure, mechanical and tribological properties of Oxide Dispersion Strengthened high-entropy alloys

Abstract

Anovelmetalmatrix composite CrMnFeCoNiwith Y2O3 as reinforcement phasewas designed andmanufactured bymechanical alloying and spark plasma sintering. After sintering at 900 °C for 5min, the microstructure consisted of a FCC matrix and Y2O3 nanoparticles. The addition of 0.25 wt % Y2O3 increased the room temperature tensile strength of the CrMnFeCoNi base from 868MPa to 1001MPa, while the mechanical properties of the addition of 0.5 wt % Y2O3 composite decreased. In the meantime, the addition of Y2O3 had no significant influence on the coefficient of friction, while the addition of 0.25 wt % Y2O3 composite shows excellent wear-resistance.