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<p><i>In-situ</i> TiB whisker (TiB<sub>w</sub>) and Ti<sub>5</sub>Si<sub>3</sub> hybrid reinforced titanium matrix composites (TMCs) were successfully fabricated <i>via</i> a rapid reactive sintering technique, which significantly enhances the mechanical properties. Using Ti, TiB<sub>2</sub>, and Si mixtue powders, the composites were synthesized in a single-step process where both TiB<sub>w</sub> and Ti<sub>5</sub>Si<sub>3</sub> reinforcements were <i>in-situ</i> formed through a solid-state reaction. Microstructural analysis indicates a uniform distribution of micro/nano-structured TiB<sub>w</sub> and Ti<sub>5</sub>Si<sub>3</sub> reinforcements throughout the Ti matrix. The resulting composites exhibit outstanding mechanical performance, including a high Vickers hardness of 522 HV and a compressive yield strength of 1.82 GPa, representing improvements of 12 and 33 pct, respectively, over only TiB<sub>w</sub> reinforced TMCs. The strengthening mechanism is attributed to the synergistic effect of load transfer from the micro-sized hybrid architecture and dispersion strengthening contributed by the nano-scale particles. This study demonstrates an efficient and cost-effective approach to fabricating high-performance TMCs with tailored microstructures.</p>

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Rapid Reactive Sintering of In-Situ Ti Matrix Composites with Micro/Nano-Sized TiBw/Ti5Si3 Hybrid Structure for Enhanced Mechanical Properties

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Chengcheng Peng,
  • Xinjiang Zhang,
  • Cailiu Yin,
  • Chunqiang Yi

摘要

In-situ TiB whisker (TiBw) and Ti5Si3 hybrid reinforced titanium matrix composites (TMCs) were successfully fabricated via a rapid reactive sintering technique, which significantly enhances the mechanical properties. Using Ti, TiB2, and Si mixtue powders, the composites were synthesized in a single-step process where both TiBw and Ti5Si3 reinforcements were in-situ formed through a solid-state reaction. Microstructural analysis indicates a uniform distribution of micro/nano-structured TiBw and Ti5Si3 reinforcements throughout the Ti matrix. The resulting composites exhibit outstanding mechanical performance, including a high Vickers hardness of 522 HV and a compressive yield strength of 1.82 GPa, representing improvements of 12 and 33 pct, respectively, over only TiBw reinforced TMCs. The strengthening mechanism is attributed to the synergistic effect of load transfer from the micro-sized hybrid architecture and dispersion strengthening contributed by the nano-scale particles. This study demonstrates an efficient and cost-effective approach to fabricating high-performance TMCs with tailored microstructures.