Abstract
Despite observations of faceting in Al-Ag GP zones by Nicholson and Nutting in 1961 and by Gragg and Cohen in 1971, no detailed explanation for faceting was given and no systematic experimental study of the type and amount of faceting has heretofore been reported. In this paper, the faceting of GP zones in an Al-Ag alloy was investigated experimentally as a function of temperature with TEM. These observations were compared with equilibrium shape calculations obtained by using a discrete lattice plane model modified by the incorporation of thermodynamic functions appropriate to the f.c.c. Al-Ag solid solution. This model was used to calculate and plot the orientation-dependence of the chemical interfacial energy as a function of reaction temperature. Wulff constructions on these plots yielded the equilibrium shapes. A reasonably accurate accounting for the faceting and its temperature-dependence has been achieved with this approach.
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