Cutting apart of γ″ Precipitates by dislocations emitted from nanoscale surface notches in ni-base alloy 725

Abstract

We present a high-resolution transmission electron microscopy study that gives evidence for cutting apart of DO22 Ni3Nb γ″ precipitates by dislocations emitted from nanoscale notches on free surfaces in Inconel® 725. This finding suggests that the surface morphology influences the rate of cutting apart of sub-surface precipitates in Ni-base alloys under mechanical loading. © 2013 M. S. Wang, J. P. Hanson, S. Gradečak, M. J. Demkowicz.