Effect of Si additions on microstructure and mechanical properties of refractory NbTaWMo high-entropy alloys

To improve the high-temperature strength and decrease the density of NbTaWMo alloys, addition of light element Si producing the second-phase silicide is employed. Refractory NbTaWMoSix (x = 0, 0.25, 0.5, 0.75) high-entropy alloys are produced by spark plasma sintering. The phase evolution, microstructure, compressive mechanical properties, and high-temperature hardness are investigated in this study. It reveals that there is only a disordered...