# Effects of a tungsten addition on the morphological evolution, spatial correlations, and temporal evolution of a model Ni-Al-Cr superalloy

Source: [Effects of a tungsten addition on the morphological evolution, spatial correlations, and temporal evolution of a model Ni-Al-Cr superalloy](<https://www.sota2.com/research/paper/68fa21287a2b558e2933577c>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:52:12.409Z

Authors: Chantal K. Sudbrack, Tiffany D. Ziebell, Ronald D. Noebe, David N. Seidman

Published: 2007-10-18T22:58:46.000Z

## Abstract

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.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/0710.3610>)

[PDF](<https://arxiv.org/pdf/0710.3610.pdf>)