Abstract
A duplex dendritic structure consists of co-existing regions of coarse and fine dendrites. Such a structure in aluminium-4,5 wt % copper alloy was produced by rapid quenching from the partially solid-partially liquid state. The concentration of solute was found to be low and constant within the coarse structure, which contains a smaller amount of non-equilibrium secondary phase than does the fine dendritic structure. The solute distribution profiles within both the coarse and fine dendritic structures were found to be fairly accurately described by the Scheil equation for non-equilibrium solidification. Complete dissolution of the secondary phase occurred within the coarse structure after a shorter solutionizing time than it did within the fine dendritic structure. A spherical diffusion model accurately described solution kinetics within the coarse structure and a cylindrical diffusion model within the fine structure.
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