High Compressibility ZrTiHfV<sub>0.5</sub>Nb<sub>0.5</sub>C<sub>X</sub> Refractory High-Entropy Alloys

Refractory high-entropy alloys (RHEAs) have outstanding characteristics such as high melting point, high temperature oxidation resistance and corrosion resistance, which shows very promising application in the high temperature field; but commonly the refractory high-entropy alloys have the disadvantages of high density and poor plasticity. In this work, ZrTiHfV 0.5 Nb 0.5 C x (x=0, 0.06, 0.12, 0.2) alloys are prepared by vacuum non-consumable arc-melting with ZrTiHfV 0.5 Nb 0.5 based. The density of ZrTiHfV 0.5 Nb 0.5 C 0.2 alloy is reduced to 8.014g/cm 3 compared to ZrTiHfV 0.5 Nb 0.5 (8.135g/cm 3 ). The microstructure, static and high-temperature compressive strength are investigated. XRD and EDS analysis show that the microstructure of ZrTiHf 0.5 Nb 0.5 C x alloys consists of BCC phase and HfC phase. ZrTiHfV 0.5 Nb 0.5 C x alloys have high compression plasticity with plastic strain> 40% at room temperature, no fracture occurred during compression and yield stress is closed to 1GPa.