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Type Mao, Zugang; Sudbrack, Chantal K.; Yoon, Kevin E.; Martin, Georges; Seidman, David N.
  Publication The mechanism of morphogenesis in a phase separating concentrated multi-component alloy Volume Journal Article
Pages 2007
  Abstract Nature Materials  
  Corporate Author  
Publisher 6  
Editor 3
  Summary Language 210-216 Series Editor  
Abbreviated Series Title What determines the morphology of a decomposing alloy? Besides the well established effect of the nucleation barrier, we demonstrate that, in a concentrated multi-component Ni(Al,Cr) alloy, the details of the diffusion mechanism affect strongly the kinetic pathway of precipitation. Our argument is based on the combined use of atomic-scale observations, employing 3-dimensional atom-probe tomography (3-D APT), lattice kinetic Monte Carlo simulations, and the theory of diffusion. By an optimized choice of thermodynamic and kinetic parameters we first reproduce the 3-D APT observations, in particular the early stage transient occurrence of coagulated precipitates. We then modify the kinetic correlations among the atomic fluxes in the simulation, without altering the thermodynamic driving force for phase separation, by changing the vacancy-solute interactions, resulting in a suppression of coagulation. Such changes can only be quantitatively accounted for with nonzero values for the off-diagonal terms of the Onsager matrix, at variance with classical models.
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no NU @ karnesky @ 1885
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