Abstract
Abstract The nature of the non-equilibrium state of grain boundaries (GBs) is investigated using a Ni-based superalloy with a microduplex γ + γ′ microstructure which is stable against the grain growth at low temperatures by means of a direct diffusion experiment. The diffusion penetration profiles (63Ni) in the as-annealed and pre-cold-deformed (10%) states of the alloy have been measured by the residual activity techniques. The influence of a number of factors (temperatre, time of diffusion anneal and time of preliminary anneal) on the shape of the penetration profiles has been investigated. The profiles for the temperatures above 923 K exhibit a single part associated with GB diffusion with an almost constant slope—∂(Inc)/∂y 6/5. Below 923 K the GB-related region of the profiles for the pre-cold-deformed samples exhibits two distinct parts with different slopes. The deeply penetrating parts of these profiles are associated with diffusion along non-equilibrium GBs, which disappear after pre-annealing at ...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
