摘要
A lightweight nonequal molar CrMoNbTaTiZr refractory high entropy alloys (RHEAs) were studied in the present work. As Ti is added to nonequal molar CrMoNbTaTiZr alloy, the crystal structure of the alloys consists of BCC and C15 Laves phase. However, the single BCC structure is obtained through the annealing process. The microstructure and compression performance of the alloys has been discussed in different Ti contents. The alloys possess a theoretical density of about 7.44 g/cm 3 and high yielding strength of up to 630 MPa at 900 °C. Furthermore, the alloy powders have been refined by high-energy ball milling with Al 2 O 3 particles. Then, the RHEA matrix composites were successfully synthesized after the sintering at 1700 °C. These composites have shown high relative density and excellent wettability. The thermal properties of RHEA composites have also been analyzed and discussed through heat capacity, thermal conductivity, and thermal expansion analysis from ambient temperature to 1400 °C.