点击次数：

论文类型： 期刊论文

发表时间： 2007-04-01

发表刊物： CHINESE JOURNAL OF AERONAUTICS

收录刊物： SCIE、EI

卷号： 20

期号： 2

页面范围： 115-119

ISSN号： 1000-9361

关键字： composite; creep; SiC; aluminum

摘要： The compression creep deformation of the high volume fraction of SiC particles reinforced Al-Mg-Si composite fabricated by pressure-less infiltration was investigated. The experimental results show that the creep stress exponents are very high at temperatures of 673 K, 723 K and 773 K, and if taking the threshold stress into account, the true stress exponent of minimum creep strain rate is still approximately 5, although the volume fraction of reinforcements is very high. The creep strain rate in the high volume fraction reinforced aluminum alloy matrix composites is controlled by matrix lattice diffusion. It is found that the creep-strengthening effect of high volume fraction of silicon carbide particles is significant, although the particles do not form effective obstacles to dislocation motion.