Abstract
Precipitation of the equilibrium y-phase at grain boundaries in an aged Al-16 wt pct (∼4.5 at. pct) Ag alloy is responsible for the formation of a solute depleted region, free of metastable Guinier-Preston (GP) zones, in the immediate vicinity of the grain boundary. Solute concentration profiles have been obtained across these grain boundary regions using Analytical Electron Microscopy (AEM) in thin foils of the alloy aged at low temperatures. The Ag concentrations at the grain boundary (between γ precipitates) and at the edge of the precipitate-free zone have been used to determine the solid solubility of Ag in Al (the α/(α + γ) solvus) and the metastable GP zone solvus line, respectively.
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