Abstract
Suitable dispersion of ceramic nanoparticles in a melt of aluminum alloys is a very hard task due to their severe tendency for agglomeration. In this study, a solid-state process including the mixing of as-received alumina and silicon carbide nanoparticles with iron and nickel powders was applied to disperse ceramic nanoparticles from their agglomerated form before a semi-solid vortex casting. After casting and solidification, the hot-rolling was utilized and as-cast and rolled samples were exposed to microstructural characterizations. It was obtained that the initial process led to the dispersion of single nanoparticles and sub-micron clusters in a matrix of nickel and iron. Also, it was found that nickel improved the dispersion of silicon carbide nanoparticles in the primary a-Al matrix and a promising dispersion was obtained after solidification and rolling, while the results for the other samples were not promising.
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