Abstract
A study of the loss of coherency suffered by gamma-prime precipitates after aging or through plastic deformation was carried out in a superalloy, IN 713C* Selected aging treatments were employed so as to observe different stages of coherency loss. Examination using transmission electron microscopy reveals that itinerant or matrix dislocations, generated either by internal stresses (carbides,etc.) or through the usual processes of general plastic deformation, rearrange themselves by cross-slip and climb around gamma-prime precipitates to produce misfit dislocation networks. Along with the network formation, the precipitate morphology changes to maximize the misfit accommodation. The final dislocation and precipitate configurations are consistent with the Lasalmonie and Strudel model.
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