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Type Sudbrack, Chantal K.; Ziebell, Tiffany D.; Noebe, Ronald D.; Seidman, David N.
  Publication Effects of a tungsten addition on the morphological evolution, spatial correlations, and temporal evolution of a model Ni-Al-Cr superalloy Volume Journal Article
Pages 2008
  Abstract Acta Materialia  
  Corporate Author  
Publisher 56  
Editor 3
  Summary Language 448-463 Series Editor  
Abbreviated Series Title The addition of 2 at.% W on the morphological evolution, spatial correlations and temporal evolution of g'(L12)-precipitates in a model Ni-Al-Cr superalloy 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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no NU @ karnesky @ 9739
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