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采用高能球磨粉末冶金法制备了10vol%nano-SiC颗粒增强纯Al基复合材料,研究了球磨时间和硬脂酸含量对复合粉末粒度和纳米颗粒分散均匀性的影响规律,并对复合材料的微观结构和拉伸性能进行了研究。结果表明,随球磨时间的延长,SiC颗粒在Al中的分散均匀性变好,而复合粉颗粒的粒径先减小后增大,在球磨时间为15h、过程控制剂硬脂酸含量为2wt%时复合粉末粒径最小。并采用此优化的混料工艺,制备出综合性能良好的nano-SiCp/Al复合材料,其抗拉强度达到392.7MPa,较纯Al提高了164.9%,伸长率达10.41%,较纯Al有所下降。复合材料的断裂机制是微孔聚集型断裂。
The effects of ball milling time and stearic acid content on the composite powder particle size and dispersion uniformity of nano-particles were investigated by high energy ball milling powder metallurgy method. The microstructure of the composites Structure and tensile properties were studied. The results show that with the milling time prolonging, the dispersion uniformity of SiC particles in Al becomes better, while the particle size of the composite powders first decreases and then increases. The ball milling time is 15h, the content of stearic acid is 2wt% % When the composite powder particle size is the smallest. The nano-SiCp / Al composites with good overall properties were prepared by this optimized mixing process. The tensile strength reached 392.7MPa, which was 164.9% higher than pure Al and the elongation reached 10.41% The decline. The fracture mechanism of the composites is micropore aggregation type fracture.