@inproceedings{5323d2b530044cd4928009193e754a75,
title = "γ′ phase instabilities in high refractory content γ-γ′ In-base superalloys",
abstract = "Detailed electron microscopy and atom probe tomography (APT) techniques were used to systematically quantify the chemical and morphological instabilities that occur during aging of polycrystalline Ni-base superalloys containing elevated levels of refractory alloying additions. The morphological changes and splitting phenomenon associated with the secondary γ′ precipitates were related to the discrete chemical compositions of the secondary and tertiary γ′ along with the phase compositions of the γ matrix and the γ precipitates that form within the secondary γ′ particles. Compositional phase inhomogeneities led to the precipitation of finely dispersed tertiary γ′ particles within the γ matrix and secondary γ particles within the secondary γ′ precipitates, which, along with surface grooving of the secondary γ′ particles, contributed to the inverse coarsening or splitting of the precipitates during aging.",
keywords = "Coarsening, Ni-base alloy, Phase transformation, γ precipitates, γ′ instability, γ′ splitting",
author = "Stoichko Antonov and Dieter Isheim and Seidman, {David N.} and Eugene Sun and Helmink, {Randolph C.} and Sammy Tin",
note = "Funding Information: Financial support for this work was provided by Rolls-Royce Corporation. Additionally, the local-electrode atom-probe tomograph at the Northwestern University Center for Atom-Probe Tomography (NUCAPT) was acquired and upgraded with equipment grants from the MRI program of the National Science Foundation (grant number DMR-0420532) and the DURIP program of the Office of Naval Research (grant numbers N00014- 0400798, N00014-0610539, N00014-0910781). NUCAPT is a Research Facility at the Materials Research Center of Northwestern University, supported by the National Science Foundation's MRSEC program (grant number DMR-1121262). Additional instrumentation at NUCAPT was supported by the Initiative for Sustainability and Energy at Northwestern (ISEN).; 13th International Symposium on Superalloys, SUPERALLOYS 2016 ; Conference date: 11-09-2016 Through 15-09-2016",
year = "2016",
language = "English (US)",
series = "Proceedings of the International Symposium on Superalloys",
publisher = "Minerals, Metals and Materials Society",
pages = "199--208",
editor = "Eric Huron and Uwe Glatzel and Cathie Rae and Sammy Tin and Beth Lewis and Venkat Seetharaman and Mark Hardy and Brian Griffin",
booktitle = "SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys",
address = "United States",
}