Dual mixed slurry for AA6061/Al2O3-Al powder was formed under argon gas protection and used to fabricate composite due to the effect of free vortex flow in semi-solid stage. Initially, Al2O3 reinforcement was mixed with aluminium powder via ball milling process and then converted into reinforcement slurry. Simultaneously, primary slurry for AA6061 alloy was prepared in closed coiled sprue. Semi-solid thick slurry was prepared for a consolidated effect of liquid reinforcement addition and solid-liquid dispersion on the cast microstructure. Finally, this mixed slurry was free to flow in open mould in free vortex flow and 668oC melt temperature condition. Observations from the microstructure, EDX and XRD reveal that Al2O3 particles and aluminium particles are segregated near the grain boundary and potentially provide an effective joining between the matrix and reinforced particles. Mechanical characteristics for tensile and impact strength for Al2O3 addition confirms a significant improvement on these properties of the AA6061 alloy. GRAPHICAL ABSTRACT

中文翻译：

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细小的Al2O3和铝纳米颗粒对6061铝合金半固态铸造显微组织晶界附近的影响

在氩气保护下形成AA6061/Al2O3-Al粉体双混合浆液，利用半固态阶段的自由涡流作用制备复合材料。最初，Al2O3 增强剂通过球磨工艺与铝粉混合，然后转化为增强剂浆料。同时，在封闭的盘绕浇口中制备了AA6061合金的初级浆料。制备半固体稠浆以增强液体增强剂添加和固-液分散对铸造显微组织的影响。最后，这种混合浆料在自由涡流和 668oC 熔体温度条件下在开模中自由流动。从微观结构观察，EDX 和 XRD 表明，Al2O3 颗粒和铝颗粒在晶界附近分离，并可能在基体和增强颗粒之间提供有效的连接。添加 Al2O3 的拉伸和冲击强度的机械特性证实了 AA6061 合金的这些性能的显着改善。图形概要