State and effect of oxygen on high entropy alloys prepared by powder metallurgy

To reveal the state and effect of oxygen on high entropy alloys (HEAs) prepared by powder metallurgy, a VNbMoTaW refractory HEA was prepared by mechanical alloying and vacuum hot-pressing sintering. During mechanical alloying, with increasing ball milling time, the elemental distribution of the VNbMoTaW powders gradually became homogeneous, and the particle size decreased, while ~0.2 atom% O was introduced. After sintering at 1700 °C and 40 MPa...