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Type Sudbrack, Chantal K.; Noebe, Ronald D.; Seidman, David N.
  Publication Compositional Pathways and Capillary Effects During Isothermal Precipitation in a Nondilute Ni-Al-Cr Alloy Volume Journal Article
Pages 2007
  Abstract Acta Materialia  
  Corporate Author Acta Mater.  
Publisher 55  
Editor 1
  Summary Language 119-130 Series Editor nanostructure; coarsening; Ni alloys; atom-probe tomography; capillary phenomena  
Abbreviated Series Title For a Ni-5.2 Al-14.2 Cr at.% alloy with moderate solute supersaturations, the compositional pathways, as measured with atom-probe tomography, during early to later stage γ'(L12)- precipitation (R = 0.45-10 nm), aged at 873 K, are discussed in light of a multi-component coarsening model. Employing nondilute thermodynamics, detailed model analyses during quasistationary coarsening of the experimental data establish that the γ/γ' interfacial free-energy is 22- 237 mJ m-2. Additionally, solute diffusivities are significantly slower than model estimates. Strong quantitative evidence indicates that an observed γ'-supersaturation of Al results from the Gibbs-Thomson effect, providing the first experimental verification of this phenomenon. The Gibbs-Thomson relationship, for a ternary system, as well as differences in measured phase equilibria with CALPHAD assessments, are considered in great detail.
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yes NU @ karnesky @ 748
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