Abstract
The early stages of the decomposition reaction in an isotopically optimized 58Ni-13 at % Al alloy at T = 450°C have been studied by means of small- and wide-angle polarized neutron scattering (SWAPNS). Number densities of extremely small Ni 3Al clusters with diameters less than 1 nm and the development of the cluster size distribution during the earliest stages of decomposition have been determined. The observed decomposition kinetics have been interpreted by means of cluster-dynamics model calculations. No nucleation energy larger than kT was found to impede the decomposition reaction.
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