Abstract
The kinetics of phase separation and coarsening occurring within the miscibility gap in the iron-chromium-cobalt system have been characterized using atom probe field-ion microscopy. The morphology and time evolution of the composition fluctuations indicate that the alloys decompose by continuous phase separation or spinodal decomposition at high supersaturations. The morphology of the two-phase microstructurc was found to be highly interconnected in three-dimensions and characteristic of an isotropic spinodal reaction. The coarsening of the network structures could be fitted to a power law with a time exponent that is significantly less than the classical Lifshitz-Slyozov-Wagner value of one-third.
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