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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 78  2019
Influence of Fine Al2O3 and Aluminium Nano-Particles on the 6061 Aluminium Alloy near the Grain Boundary of the Semi-Solid Cast Microstructure
Mayank Agarwal1, 2, * and Rajeev Srivastava1
Pages : 94-100
DOI : 10.1080/0371750X.2019.1615847
Abstract
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. [Keywords: AA6061, Semi-solid casting, Thick slurry, Microstructure, Al2O3, Interface]
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