原位生成SiC/TiSi_2纳米复合材料的显微结构

STUDY ON MICROSTRUCTURE OF IN SITU PRODUCED SiC/TiSi_2 NANOCOMPOSITE

采用Si粉和TiC为原料，通过反应热压可制得纳米SiC粒子复合的TiSi2材料，生成的纳米SiC粒子聚集分布在TiSi2基体中，SiC粒子与TiSi2的界面没有晶界相存在．但由于残余应力的作用．TiSi2晶格发生扭曲并有位错出现。

SiC/TiSi2 nanocomposite has been fabricated by hot pressing the mixed powders of Si and TiC. The reaction formed SiC particles are nanosized and distribute as clusters in TiSi2 matrix. The residual stress was induced due to the different thermal expansion coefficients of SiC and TiSi2. No amorphous phase was found on the interface between of SiC and TiSi2, however lattice twist and dislocations were observed in TiSi2 grains.