It is necessary to improve the high temperature strength and maintain reasonable room temperature toughness of refractory high entropy alloy. A novel type of HfMoScTaZr refractory high entropy alloy was prepared by vacuum arc melting equipment. The microstructure of the alloy was analyzed by XRD, SEM, TEM and DSC. The hardness and mechanical properties of the alloy were measured by microhardness tester and micro-electronic universal testing machine. The results show that the refractory high entropy alloy is a single disordered BCC solid solution structure with lattice constant a = 0.3387 nm, alloy density about 9.28 g/cm³, Vickers microhardness about 9400 MPa and yield strength σ_0.2 = 1778 MPa. The compressive yield strength of the alloy at room temperature, 800 °C, 1000 °C and 1200 °C are 1778, 1118, 963 and 498 MPa, respectively. The mechanical properties of HfMoScTaZr are better than that of most refractory high entropy alloys

有必要提高耐火高熵合金的高温强度并保持合理的室温韧性。利用真空电弧熔炼设备制备了新型的HfMoScTaZr难熔高熵合金。通过XRD，SEM，TEM和DSC对合金的显微组织进行了分析。用显微硬度计和微电子万能试验机测定合金的硬度和力学性能。结果表明，该耐火高熵合金是一种单无序BCC固溶体结构，晶格常数a = 0.3387纳米，合金密度约9.28克/厘米³，显微硬度约9400兆帕，屈服强度σ _0.2 = 1778兆帕。合金在室温，800°C，1000°C和1200°C下的抗压屈服强度分别为1778、1118、963和498 MPa。HfMoScTaZr的机械性能优于大多数难熔高熵合金