Abstract
Precipitation of carbon from supersaturated solid solution in vanadium has been measured using internal friction, electrical resistance, and transmission electron microscopy. The precipitation rate is shown to fit an equationw = 1 −- exp [−(t/τ)n]. Values ofn near 0.5 imply a one-dimensional diffusional process. An Arrhenius plot of τ is consistent with diffusion of carbon, thus the precipitation rate must largely be dependent on rate of carbon diffusion. Precipitates formed in the range of aging temperatures 100° to 200°C are very finely divided; they can barely be observed by transmission electron microscopy even with prolonged aging.
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