Abstract
Supersaturated Au80Fe20 and Au70Fe30 solid solutions have been obtained by rapid solidification. The lattice constant a0 of the as-quenched FCC phase was of 4.025 and 3.989Å for Au80Fe20 and Au70Fe30, respectively. Thermal treatments have been performed in the temperature range between 320°C and 550°C. A precipitation reaction has been observed in Au80Fe20 only after prolonged annealing at low temperature (320°C/168h). In Au70Fe30 an increase in the lattice constant has been observed after thermal treatments, giving values ranging from 3.998 to 4.044Å. Precipitation occurs at grain boundaries and into grains. Low-temperature annealings give lamellar precipitates, which grow and transform into globules at higher temperatures.A Williamson–Hall plot for the FCC phase shows a significant scatter due to occurrence of planar defects. A detailed analysis of microstructure have been obtained by Rietveld analysis of peak broadening. Precipitation reaction leaves a Fe-depleted matrix, which shows a cristallite size of about 200Å and an r.m.s. microstrain of 6×10−3. Compound fault probability has been estimated from asymmetric peak profile.
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