The equiatomic refractory high entropy alloy (HEA) TiZrNbMoTa was investigated. The alloyed powders with face-centered cubic (FCC) structured solid solution phase were prepared by mechanical alloying (MA) and then sintered by spark plasma sintering (SPS) at 1300, 1400, 1500, and 1600 °C. The microstructure and mechanical properties of the bulk alloy were investigated. The body-centered cubic (BCC) structured solid solution phase and the ZrO₂ phase precipitated from the FCC structured solid solution phase during cool-down from sintering. The highest compression fracture strength (3759 MPa) and fracture strain (12.1%) were obtained in the refractory HEA sintered at 1400 °C. The grain boundary strengthening, precipitation strengthening, solid solution strengthening, transformation-induced plastic (TRIP) effect, and toughening effect of the ZrO₂ phase are the important factors for the high strength and ducitily of the refractory HEA prepared in this study.

研究了等原子质难熔高熵合金（HEA）TiZrNbMoTa。通过机械合金化（MA）制备具有面心立方（FCC）结构固溶相的合金粉末，然后在1300、1400、1500和1600°C下通过火花等离子体烧结（SPS）进行烧结。研究了块状合金的组织和力学性能。体心立方（BCC）结构固溶体相和ZrO ₂在烧结冷却过程中，FCC固相从FCC析出。在1400°C烧结的耐火HEA中获得最高的压缩断裂强度（3759 MPa）和断裂应变（12.1％）。ZrO ₂相的晶界强化，析出强化，固溶强化，相变诱导塑性（TRIP）效应和增韧效应是本研究制备的难熔HEA的高强度和高屈服性的重要因素。