摘要
The Al2O3-SiO2(sf)(volume fraction,20%)/Al-12.6Si metal matrix composites(MMCs)with or without rare earth Pr addition were fabricated by infiltration squeeze method.Effect of Pr addition on microstructures and fractographs of Al-Si MMCs was investigated by SEM and TEM.Tensile properties at room temperature and 200℃were tested.It is shown that the addition of Pr is favorable to produce uniform microstructures and modify the eutectic Si crystal effectively.Compounds/intermetallics with high content of Pr are formed at the interface between short fiber and matrix.Yield strength(σ 0.2 ),ultimate tensile strength(σ b)and fracture elongation of Al-Si MMCs are improved by adding suitable amount of Pr.Compared with those values of Al-Si based MMC at 200 ℃,σ 0.2 andσ bof MMC with 0.29%Pr are increased by 33%and 55%,respectively.The tensile fracture surface of Al-Si MMCs with Pr addition presents ductile fracture features.
The Al2O3-SiO2（sf） （volume fraction, 20%）/Al-12.6Si metal matrix composites（MMCs） with or without rare earth Pr addition were fabricated by infiltration squeeze method. Effect of Pr addition on microstructures and fractographs of Al-Si MMCs was investigated by SEM and TEM. Tensile properties at room temperature and 200 ℃ were tested. It is shown that the addition of Pr is favorable to produce uniform microstructures and modify the eutectic Si crystal effectively. Compounds/intermetallics with high content of Pr are formed at the interface between short fiber and matrix. Yield strength（σ0.2）, ultimate tensile strength（σb） and fracture elongation of Al-Si MMCs are improved by adding suitable amount of Pr. Compared with those values of Al-Si based MMC at 200 ℃, σ0.2 and σb of MMC with 0.29% Pr are increased by 33% and 55%, respectively. The tensile fracture surface of Al-Si MMCs with Pr addition presents ductile fracture features.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2009年第5期1081-1086,共6页
Transactions of Nonferrous Metals Society of China
基金
Project(2008B080703001)supported by Guangdong Provincial Science&Technology Breau,China
