The relationships between microstructures and mechanical properties especially strength and toughness of high-entropy carbide based ceramics are reported in this article. Dense (Ti_0.2Zr_0.2Hf_0.2Nb_0.2Ta_0.2)C (HEC) and its composite containing 20 vol.% SiC (HEC-20SiC) were prepared by spark plasma sintering. The addition of SiC phase enhanced the densification process, resulting in the promotion of the formation of the single-phase high-entropy carbide during sintering. The high-entropy carbide phase demonstrated a fast grain coarsening but SiC particles remarkably inhibited this phenomena. Dense HEC and HEC-20SiC ceramics sintered at 1900 °C exhibits four-point bending strength of 332 ± 24 MPa and 554 ± 73 MPa, and fracture toughness of 4.51 ± 0.61 MPa·m^1/2 and 5.24 ± 0.41 MPa·m^1/2, respectively. The main toughening mechanism is considered to be crack deflection by the SiC particles.

本文报道了高熵碳化物基陶瓷的微观结构与机械性能之间的关系，特别是强度和韧性。致密（Ti _0.2 Zr _0.2 Hf _0.2 Nb _0.2 Ta _0.2通过火花等离子体烧结制备C（HEC）及其包含20vol。％SiC的复合材料（HEC-20SiC）。SiC相的添加增强了致密化过程，从而促进了烧结过程中单相高熵碳化物的形成。高熵碳化物相显示出快速的晶粒粗化，但是SiC颗粒显着抑制了这种现象。在1900°C烧结的致密HEC和HEC-20SiC陶瓷的四点弯曲强度分别为332±24 MPa和554±73 MPa，断裂韧性为4.51±0.61 MPa·m ^1/2和5.24±0.41 MPa·m ^{1 / 2}。认为主要的增韧机理是SiC颗粒引起的裂纹挠曲。