Abstract
AbstractField ion microscopy combined with mass spectroscopy, the atom probe, is applied to the analysis of nuclei in the decomposition of alloys. The interface of the particles shows the sharp concentration profile expected from Becker's theory. The time evolution of particle size, density and matrix supersaturation is measured for the first time during the nucleation stage of alloy decomposition. It is shown that Ostwald ripening must be taken into account already during this stage in agreement with a recent theory of Langer and Schwartz. The alternative spinodal decomposition mode can also be clearly recognized in the atom probe but a satisfactory non‐linear theory for this mode is still missing.
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