Microstructure, Mechanical and Tribological Properties of Oxide Dispersion Strengthened High-Entropy Alloys

A novel metal matrix composite CrMnFeCoNi with Y(2)O(3) as reinforcement phase was designed and manufactured by mechanical alloying and spark plasma sintering. After sintering at 900 °C for 5 min, the microstructure consisted of a FCC matrix and Y(2)O(3) nanoparticles. The addition of 0.25 wt % Y(2)O(3) increased the room temperature tensile strength of the CrMnFeCoNi base from 868 MPa to 1001 MPa, while the mechanical properties of the addition of 0.5 wt % Y(2)O(3) composite decreased. In the meantime, the addition of Y(2)O(3) had no significant influence on the coefficient of friction, while the addition of 0.25 wt % Y(2)O(3) composite shows excellent wear-resistance.