NTRS - NASA Technical Reports Server

Back to Results
Effects of Rhenium Addition on the Temporal Evolution of the Nanostructure and Chemistry of a Model Ni-Cr-Al SuperalloyThe temporal evolution of the nanostructure and chemistry of a model Ni-8.5 at.% Cr-10 at.% Al alloy with the addition of 2 at.% Re was studied using transmission electron microscopy and atom-probe tomography in order to measure the number density and mean radius of the y' (LIZ) precipitates and the chemistry of the y'-precipitates and the y (fcc)-matrix. In this article, the coarsening behavior of the y'-precipitates is discussed in detail and compared with the Umantsev-Olson model for multi-component alloys. In addition, the experimental results are evaluated with PrecipiCalc(TradeMark) simulations. The results show that the diffusivities of the solute elements play a major role in the coarsening behavior of the y'-precipitates and that the addition of Re retards the coarsening kinetics and stabilizes the spheroidal morphology of the precipitates by reducing the interfacial energy.
Document ID
Document Type
Preprint (Draft being sent to journal)
Yoon, Kevin E. (Northwestern Univ. Evanston, IL, United States)
Noebe, Ronald D. (NASA Glenn Research Center Cleveland, OH, United States)
Seidman, David N. (Northwestern Univ. Evanston, IL, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2007
Subject Category
Metals and Metallic Materials
Funding Number(s)
WBS: WBS 698671.01.03.17
Distribution Limits