低温球磨结合等离子活化烧结TiC颗粒增强钛基复合材料的组织与性能

Microstructure and Properties of TiC Particle-Reinforced Titanium Matrix Composites Prepared by Cryomilling Combined with Plasma Activated Sintering

通过低温球磨结合等离子活化烧结制备TiC颗粒增强钛基复合材料(TMC1),研究了TMC1试样的物相组成、显微组织、力学性能及强化机理,并与普通高能球磨结合等离子活化烧结制备复合材料(TMC2)进行对比。结果表明:TMC1试样基体由均匀细小的等轴α晶粒和β转变相组成,TiC颗粒在基体中分布均匀,TMC1试样的晶粒尺寸远小于TMC2试样;900~1200℃烧结的TMC1试样均实现致密化,抗压强度和硬度随烧结温度升高而降低;TMC1试样相比TMC2试样具有更高的相对密度、硬度和强度;TMC1试样的强化机理为颗粒强化和细晶强化。

TiC particle-reinforced titanium matrix composites(TMC1)were fabricated by cryomilling combined with plasma activated sintering.The phase composition,microstructure,mechanical properties and strengthening mechanism of TMC1 sample were studied and compared with the composites(TMC2)prepared by ordinary high energy ball milling combined with plasma activated sintering.The results show that the matrix of TMC1 sample was composed of uniform and fine equiaxialαgrains andβtransformed phase with TiC particles dispersed evenly.The grain size of TMC1 sample was much smaller than that of TMC2 sample.TMC1 samples sintered at 900-1200℃were compact,and the compressive strength and hardness decreased with increasing sintering temperature.The relative density,hardness,and strength of TMC1 sample were higher than those of TMC2 sample.The strengthening mechanism of TMC1 sample was particle strengthening mechanism and fine grain strengthening mechanism.