高压扭转法对SiC_p-Al基复合材料颗粒分布的影响

Effect of High-pressure Torsion on Particle Distribution of SiC_p-Al Composites

采用高压扭转(High-Pressure Torsion,HPT)工艺制备SiCp-Al基复合材料。通过显微组织的定性分析及样方法的定量计算,深入研究不同工艺参数对SiC颗粒分布的影响规律,结果表明:采用高压扭转法可以直接将8.75%(体积分数)SiC-Al混合粉末制备成金属基复合材料。通过金相分析得出:SiC颗粒在试样不同扭转半径处分布情况具有差异:工艺参数(温度、压力、圈数)对SiC颗粒分布有重要影响,结合样方法对颗粒分布情况的定量分析得出:随着扭转圈数、压力、扭转半径的增大,剪切作用增强,SiC颗粒分布均匀性提高;变形温度升高,基体流动性提高,颗粒分布均匀性得到改善。

SiCp-Al matrix composites were fabricated by High-Pressure Torsion.Based on microstructural observations and the quadrat method,the effect of different technological parameters on distribution of SiC particles was studied.The result shows that,SiC particles and Al powder mixtures are directly fabricated into composites by High Pressure Torsion;According to micro structural observations,there is difference of distribution of SiC particles along the distance from the center;the factors（the number of turns,pressure,temperature） could significantly influence the distribution of SiC particles;Combined with quadrat method,the shear strain augments with the number of turns,pressure,the distance from the center increasing,then the distribution of SiC particles is more homogeneous,With temperature increasing,the matrix flow ability becomes better,which makes the distribution of particles improved.