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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