SiC_(p)含量对SiC_(p)/Al-1.2Mg-0.6Si铝基复合材料组织和性能影响

Influence of SiC_(p) Content on Microstructure and Properties of SiC_(p)/Al-1.2Mg-0.6Si Aluminum Matrix Composites

采用粉末冶金法制备SiC_(p)/Al-1.2Mg-0.6Si铝基复合材料,分析了该复合材料的均匀性和界面结合情况,探讨了几种体积分数该复合材料的显微组织和性能变化。结果表明,SiC颗粒和基体之间的界面清晰平滑,界面结合良好,但随着热压温度的增加,SiC与基体间的微观缩孔和析出相逐渐增多。随着SiC颗粒含量的增加,材料的弹性模量、热导率显著提高,弯曲强度先升高后下降,而热膨胀系数逐渐降低。

The powder metallurgy method was used to prepare SiC_(p)/Al-1.2Mg-0.6Si aluminum matrix composites,the uniformity and interfacial bonding of the composites was analyzed,and the changes of the microstructure and properties of the composites with several SiC_(p) volume fraction were discussed.The results show that the interface between SiC particles and the matrix is clear and smooth with good interfacial bonding,but as the hot pressing temperature increases,the micro-pores and precipitates between SiC and the matrix gradually increase;as the content of SiC particles increases,the elastic modulus and thermal conductivity of the material significantly increase,the bonding strength first increases and then decreases,and the coefficient of thermal expansion gradually decreases.