The microstructure of Inconel 706 alloy was studied by three-dimensional atom probe (30AP) and high resolution transmission electron microscopy (HRTEM) after two heat treatments: direct ageing (OA) and modified stabilization heat treatment (MST). Both heat treatments produced intermetallic y' and y" phases in nanometer size. The microchemical information of the individual y' and y" precipitates as well as of the y'/y" and y"/y'/y" co-precipitates was obtained by 30AP. Atom probe analysis on individual precipitates showed different partitioning behaviour compared to that of co-precipitates. Small clusters of Nb were found around individual y' precipitates.
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