Copper matrix composites reinforced by in situ-formed hybrid titanium boride whiskers (TiB_w) and titanium diboride particles (TiB_2p) were fabricated by powder metallurgy. Microstructural observations showed competitive precipitation behavior between TiB_w and TiB_2p, where the relative contents of the two reinforcements varied with sintering temperature. Based on thermodynamic and kinetic assessments, the precipitation mechanisms of the hybrid reinforcements were discussed, and the formation of both TiB_w and TiB_2p from the local melting zone was thermodynamically favored. The precipitation kinetics were mainly controlled by a solid-state diffusion of B atoms. By forming a compact compound layer, in situ reactions were divided into two stages, where Zener growth and Dybkov growth prevailed, respectively. Accordingly, the competitive precipitation behavior was attributed to the transition of the growth model during the reaction process.

通过粉末冶金法制备了由原位形成的混合硼化钛晶须（TiB _w）和二硼化钛颗粒（TiB _2p）增强的铜基复合材料。微观结构观察表明 TiB _w和 TiB _2p之间存在竞争性析出行为，其中两种增强材料的相对含量随烧结温度而变化。基于热力学和动力学评估，讨论了混合增强材料的析出机制，以及 TiB _w和 TiB _2p的形成来自局部熔化区的热力学有利。沉淀动力学主要由 B 原子的固态扩散控制。通过形成致密的化合物层，原位反应分为两个阶段，分别以齐纳生长和 Dybkov 生长为主。因此，竞争性沉淀行为归因于反应过程中生长模型的转变。