Microstructure and Tensile Properties of Yttria Coated-Alumina Particulates Reinforced Aluminum Matrix Composites

摘要

The liquid-phase coating method was used to deposit Y_2O_3 ceramic on the surface of alpha-Al_2O_3. The coated-Al_2O_(3p)/6061AI composites were produced using squeeze casting technology. The microstructure and tensile properties of the composites were analysed and studied. The results showed that the coated AI_2O_3 particles are able to disperse homogeneously in the aluminum liquid. The microstructure of the composites is more even in comparison with that of as-received powders. The tensile testing indicated that mechanical properties of the coated- Al_2O_(3p)/GOSlAI composites are better than those of uncoated particles, in the composite with 30 percent volume fraction, the tensile strength, yield strength as well as elongation is increased by 29.8 percent, 38.4 percent and 10.3 percent, respectively. The SEM analysis of fracture indicated that the dimples of the coated- Al_2O_(3p)/6061AI composites are more even.