采用搅拌铸造技术制备SiC颗粒(5%,质量分数)和赤泥(5%~20%,质量分数)颗粒增强2024铝基复合材料.利用扫描电子显微镜(SEM)和电子能谱(EDS)技术表征合成的复合材料;另外,利用Taguchi实验设计方法测试混杂复合材料的抗拉强度.结果表明,混杂复合材料中的增强颗粒分散均匀,结合充分;复合材料的密度和孔隙率随着增强体含量的增加而降低,抗拉强度随着赤泥含量和时效时间的增加而增加;复合材料中赤泥含量对抗拉强度影响最大,其次是时效时间.总体来说,与基体材料Al2024铝合金相比,铝合金/SiC/赤泥复合材料在优化条件下具有更优异的抗拉强度(高34%).%The stir casting technique was used to fabricate aluminum 2024 matrix hybrid composites reinforced with SiC (5%, mass fraction) and red mud (5%-20%, mass fraction) particles. The developed composites were characterized by using scanning electron microscopy (SEM) and electron dispersive spectrum (EDS) techniques. Further, Taguchi's approach of experimental designwas used to examine the tensile strength of the hybrid composites (with minimum number of experiments). It was found that the reinforcing particles were well dispersed and adequately bonded in the hybrid composites. The density and porosity of the hybrid composites were reduced with the increase in reinforcement content. The tensile strength of the composites increased with the increase in the red mud content and the ageing time. The developed model indicated that the red mud content had the highest influence on the tensile strength response followed by the ageing time. Overall, it was found that Al2024/SiC/red mud composites exhibited superior tensile strength (about 34% higher) in comparison to the Al2024 alloy under optimized conditions.
展开▼
