氧化SiCp增强ZL101铝基复合材料的显微结构

Study of insitu TiAl_3 reinforcement aluminum matrix composite

研究了内生复合材料ＴｉＡｌ３／ＺＬ１０１ 的金相组织和常规力学性能，探讨了复合材料增强的基本原理．研究表明，内生复合材料中增强物呈弥散分布；无论在铸态还是热处理态，复合材料的强度和硬度都较基体有较大幅度提高，特别是延伸率也较基体略有增加．这是内生增强体与外加增强体制备的复合材料性能变化的显著不同点．

Oxidized SiC particulate reinforced ZL101 Al based composite was fabricated by a modified melt stirring process and followed by two cast processes,permanent mold casting and horizental continuous casting,respectively. The study on the as cast microstructure,including the interfacial region of the composite,showed that the SiO 2 crystal layer on the surface of oxidized SiC p reacts with elements Mg and Al in the Al alloy melt during stirring and casting of the composite and produces M 2Al 2O 4 spinel and Si,which improved the wettability between SiC p and Al alloy melt and made the dispersing of SiC p less difficult. Compared with permanent mold cast SiC p/ZL101 composite,the microstructure of continuous cast SiC p/ZL101 has some good features:an uniformal distribution of SiC p,decreased matrix dendrite arm spacing and limited interfacial reaction zone.