搅拌参数对半固态搅拌工艺制备(ABOw+SiCp)/6061Al复合材料微观组织和力学性能的影响

摘要

采用不同半固态机械搅拌工艺(变化搅拌温度和搅拌时间),制备硼酸铝晶须(ABOw)和碳化硅颗粒(SiCp)混杂增强6061铝基复合材料.利用扫描电镜(SEM)、X射线衍射(XRD)、透射电镜(TEM)和拉伸试验研究搅拌工艺参数对复合材料微观组织和力学性能的影响.结果表明:在可以搅拌的情况,增强体在复合材料中分布的均匀性和复合材料的力学性能随着搅拌温度的降低和搅拌时间的延长而得到提高.基于对复合材料微观组织的观察和力学性能的测试得到最佳的搅拌工艺参数为:搅拌温度640℃,搅拌时间30 min.%Aluminum borate whisker (A.BOw) and silicon carbide particle (SiCp) hybrid reinforced 6061AR matrix composites ((ABOw+SiCp)/6061Al) were fabricated by semi-solid mechanical stirring technique with different stirring temperatures and different stirring time.The influence of stirring parameters on mierostructure and mechanical properties of the composites was investigated using scanning electron microscopy (SEM),X-ray diffractometry (XRD),transmission electron microscopy (TEM) and tensile tests.The results reveal that the homogeneity of reinforcement and tensile properties increase with decreasing the stirring temperature and increasing the stirring time.The optimal stirring parameters of 640 ℃ and 30 min are exploited based on the microstructure observation and tensile properties of the composites.