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<p>Conventional liquid-phase <i>in-situ</i> synthesis of Cu-TiB<sub>2</sub> composites often suffers from coarse and non-uniformly distributed reinforcements. These challenges stem from an insufficient understanding and a lack of effective control over the <i>in-situ</i> nucleation and growth mechanisms of TiB<sub>2</sub> particles. This study introduces a novel melt dispersionturbulent mixing (MDTM) <i>in-situ</i> reaction technology to fabricate high-performance Cu-TiB<sub>2</sub> composites. The MDTM strategy synergistically refines reaction micro-regions by reducing the initial melt droplet size via melt dispersion while enhancing solute convection via turbulence. This synergy promotes high-density nucleation and refinement of TiB<sub>2</sub> particles. Based on turbulence characteristics and <i>in-situ</i> reaction kinetics, we optimized the melt disperser parameters and established a quantitative model linking particle size to disperser rotation speed and reactant solute concentration. It was found that disperser rotation speed governs three distinct nucleation and growth mechanisms for TiB<sub>2</sub> particles. Low-density nucleation at low disperser rotation speeds (0–50 r/min) leads to coarse TiB<sub>2</sub> particles. At medium rotation speeds (100–150 r/min), the refinement of micro-regions in the dual-melt reaction achieves high-density TiB<sub>2</sub> nucleation. Conversely, at high rotation speeds (150–200 r/min), intense turbulence weakens the nucleation driving force and induces TiB<sub>2</sub> particle coarsening. This work provides new insights into liquid-phase <i>in-situ</i> reaction mechanisms and offers a novel, controllable route for fabricating highperformance micro/nano particle-reinforced metal matrix composites.</p>

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Nucleation and growth mechanisms of TiB2 particles in copper matrix composites prepared by melt dispersion-turbulent mixing in-situ reaction method

  • 期刊论文

  • 发表日期：

    2026年2月10日

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  • Tao Zhou,
  • Liuxin Qin,
  • Yanbin Jiang,
  • Wei Chen,
  • Jing He,
  • Lin Su,
  • Shifang Li,
  • Rongjia Yu,
  • Tianze Hu,
  • Meng Wang,
  • Zhu Xiao,
  • Yanlin Jia,
  • Qian Lei,
  • Zhou Li

摘要

Conventional liquid-phase in-situ synthesis of Cu-TiB2 composites often suffers from coarse and non-uniformly distributed reinforcements. These challenges stem from an insufficient understanding and a lack of effective control over the in-situ nucleation and growth mechanisms of TiB2 particles. This study introduces a novel melt dispersionturbulent mixing (MDTM) in-situ reaction technology to fabricate high-performance Cu-TiB2 composites. The MDTM strategy synergistically refines reaction micro-regions by reducing the initial melt droplet size via melt dispersion while enhancing solute convection via turbulence. This synergy promotes high-density nucleation and refinement of TiB2 particles. Based on turbulence characteristics and in-situ reaction kinetics, we optimized the melt disperser parameters and established a quantitative model linking particle size to disperser rotation speed and reactant solute concentration. It was found that disperser rotation speed governs three distinct nucleation and growth mechanisms for TiB2 particles. Low-density nucleation at low disperser rotation speeds (0–50 r/min) leads to coarse TiB2 particles. At medium rotation speeds (100–150 r/min), the refinement of micro-regions in the dual-melt reaction achieves high-density TiB2 nucleation. Conversely, at high rotation speeds (150–200 r/min), intense turbulence weakens the nucleation driving force and induces TiB2 particle coarsening. This work provides new insights into liquid-phase in-situ reaction mechanisms and offers a novel, controllable route for fabricating highperformance micro/nano particle-reinforced metal matrix composites.