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采用搅拌铸造工艺制备AA6061/15%TiC(质量分数)铝基复合材料。构建一个经验公式用于预测搅拌铸造工艺参数对AA6061/TiC铝基复合材料极限抗拉强度的影响。采用有4因素、5水平组成的中心旋转组合设计方案来减少搅拌铸造实验次数。实验因素包括搅拌速率、搅拌时间、搅拌叶片角度和铸造温度。采用所建立的经验公式和显微组织观察分析这些因素对AA6061/TiC铝基复合材料极限抗拉强度的影响。分析结果表明:上述各因素均显著影响复合材料的极限抗拉强度。复合材料极限抗拉强度的变化归因于孔隙率、团簇的形成、TiC颗粒在晶界的偏析及其在铝基体中的均匀分布。
AA6061 / 15% TiC (mass fraction) aluminum matrix composites were prepared by a stirring casting process. An empirical formula was constructed to predict the effect of process parameters on the ultimate tensile strength of AA6061 / TiC aluminum matrix composites. A four-factor, five-level center-rotating combination design was used to reduce the number of mixing casting trials. Experimental factors include stirring rate, mixing time, stirring blade angle and casting temperature. The influence of these factors on the ultimate tensile strength of AA6061 / TiC aluminum matrix composites was analyzed by the established empirical formula and microstructure observation. The results show that the above factors significantly affect the ultimate tensile strength of the composites. The ultimate tensile strength of the composites is attributed to the porosity, the formation of clusters, the segregation of TiC particles at the grain boundaries and their uniform distribution in the aluminum matrix.