Fabrication of Al/A206-Al_2O_3 nano/micro composite by combining ball milling and stir casting technology

摘要

Al206/5vol.%Al_2O_(3p) cast composites were fabricated by the injection of reinforcing particles into molten Al alloy in two different forms, i.e. as Al_2O_3 particles and milled particulates of alumina with Al and Mg powders. The resultant milled powders (Master Metal Matrix Composite (MMMC)) were then added into the molten Al alloy both in semi-solid state and above liquidus temperature. Effects of powder addition technique, reinforcement particle size and casting temperature on distribution and incorporation of reinforcing particles into molten Al alloy were investigated. Morphology evolution of powders during milling, microscopic examinations of composite and matrix alloy were studied by scanning electron microscopy (SEM). X-ray diffraction (XRD) analysis was also used to determine the possible interaction between powders after ball milling process. Results showed that injection of powders in the form of MMMC leads to considerable improvement in incorporation and distribution of Al_2O_(3p) in the A1206 matrix alloy leading to the improvement in tensile properties. Improvement in tensile properties is attributed to the better wetting of Al_2O_(3p) by melt as well as removing microchannels and roughness on alumina particles as a consequence of ball milling process.