Effects of a tungsten addition on the morphological evolution, spatial correlations, and temporal evolution of a model Ni-Al-Cr superalloy
| dc.creator | Sudbrack, Chantal K. | |
| dc.creator | Ziebell, Tiffany D. | |
| dc.creator | Noebe, Ronald D. | |
| dc.creator | Seidman, David N. | |
| dc.date | 2007-10-18 | |
| dc.date.accessioned | 2026-07-07T08:37:17Z | |
| dc.date.available | 2026-07-07T08:37:17Z | |
| dc.description | The effect of adding 2 at.% W to a model Ni-Al-Cr superalloy on the morphological evolution, spatial correlations and temporal evolution of g'(L12)-precipitates at 1073 K is studied with scanning electron microscopy and atomic force microscopy. Adding W yields a larger microhardness, earlier onset of spheroidal-to-cuboidal precipitate morphological transition, larger volume fraction (from ~20 to 30%), reduction in coarsening kinetics by one third and a larger number density (Nv) of smaller mean radii (<R>) precipitates. The kinetics of <R> and interfacial area per unit volume obey t1/3 and t-1/3 relationships, respectively, which is consistent with coarsening driven by interfacial energy reduction. The Nv power law dependencies deviate, however, from model predictions indicating that a stationary-state is not achieved. Quantitative analyses with precipitate size distributions, pair correlation functions, and edge-to-edge interprecipitate distance distributions gives insight into 2D microstructural evolution, including the elastically driven transition from a uniform g'-distribution to one-dimensional <001>-strings to eventually clustered packs of g'-precipitates in the less densely packed Ni-Al-Cr alloy. | |
| dc.description | in-press, Acta Materialia: 44 pages, 15 figures (double spaced Word document) | |
| dc.identifier | https://arxiv.org/abs/0710.3610 | |
| dc.identifier | http://arxiv.org/abs/0710.3610 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/140350 | |
| dc.subject | Materials Science | |
| dc.title | Effects of a tungsten addition on the morphological evolution, spatial correlations, and temporal evolution of a model Ni-Al-Cr superalloy | |
| dc.type | text |