粉末形态对热压态SiC_p/Al复合材料的颗粒分布与力学性能影响

Effect of powder morphology on particulate distribution and mechanical properties of hot state SiC_p/Al composites

探讨了不同球磨时间的SiC p/2009铝粉末形貌的演化、SiC p颗粒分布及其对复合材料力学性能的影响。结果表明,高能球磨可以有效地改善复合材料中SiC p颗粒的分布状况,随着球磨时间的延长,增强颗粒分布均匀性逐渐提高,但复合材料的强度并不一直随着增强颗粒分布均匀性的提高而增长。球磨4 h时,复合材料粉末处于冷焊阶段,不仅可以显著改善复合材料的颗粒分布均匀性,而且由于其粉末尺寸较大,比表面积小,受氧化的影响更小,显示出较高的力学性能。

The effects of milling time on the powder morphology, SiCp distribution and the tensile properties of the SiCp/2009A1 composites were investigated. The results demonstrated that high energy ball mill effectively improved the homogeneity of the SiCp distribution. In- creasing milling time further improved the homogeneity of SiCp, distribution; however, the strength of the composites did not increase linearly as milling time increased. The highest strength was obtained at the cold-welding stage cellent SiCk, distribution and smaller oxidation surface area of larger powder size at this stage. after milling for four hours, mainly due to ex- of the alloy powders led by smaller specific