Abstract Boron carbide experiences glass-like brittle behavior when subjected to high shear stresses due to stress-induced amorphization. Strategies to mitigate amorphization have primarily focused on Si/B co-doping. However, the overall mechanical properties of Si/B co-doped boron carbide are unknown. Here, we delivered a comprehensive report on the mechanical properties of Si/B co-doped boron carbide; and proposed an effective strategy to improve the mechanical properties through TiB2 reinforcement. Vickers hardness of 25.0 GPa, indentation toughness of 2.1 MPa·m0.5, Young’s modulus of 430 GPa, and flexural strength of 338 MPa were measured for Si/B co-doped boron carbide. The reinforcement with TiB2 increased the overall mechanical properties to 26.6 GPa for hardness, 2.3 MPa·m0.5 for indentation toughness, and 410 MPa for flexural strength. The improvements were attributed to the combined effects of grain size refinement and crack propagation alteration due to TiB2 addition.

中文翻译：

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通过 TiB2 增强提高 Si/B 共掺杂碳化硼的机械性能

摘要 碳化硼在承受高剪切应力时会由于应力诱导非晶化而出现类似玻璃的脆性行为。减轻非晶化的策略主要集中在 Si/B 共掺杂上。然而，Si/B 共掺杂碳化硼的整体机械性能是未知的。在这里，我们提供了关于 Si/B 共掺杂碳化硼的力学性能的综合报告；并提出了一种通过 TiB2 增强提高力学性能的有效策略。Si/B共掺杂碳化硼的维氏硬度为25.0 GPa，压痕韧性为2.1 MPa·m0.5，杨氏模量为430 GPa，弯曲强度为338 MPa。TiB2 增强使整体机械性能提高到硬度 26.6 GPa、压痕韧性 2.3 MPa·m0.5 和弯曲强度 410 MPa。