Abstract
Chemical analyses of individual precipitates found during the initial stages of precipitation of copper from Fe-1.4 at. pct Cu at 500°C were made with the FIM-atom probe. Precipitates as small as 8 × l0−8cm in diam were analyzed. The results indicate that the precipitate nuclei contain much less copper than the equilibrium e phase and that most of the particle-matrix boundaries are less than 10−7 cm wide. The average copper content of the precipitates increases with aging time until well after the alloy reaches its peak strength. Thermodynamic calculations show that it is reasonable to expect the precipitate compositions that were experimentally observed.
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