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Mao, Zugang; Sudbrack, Chantal K.; Yoon, Kevin E.; Martin, Georges; Seidman, David N. |
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Impact of vacancy diffusion on the early decomposition stages of alloys |
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Journal Article |
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2005 |
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36 |
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The kinetic pathway for nucleation and growth is commonly thought to be
dictated by the initial supersaturation of solutes in the solid solution undergoing
phase separation. We demonstrate that the details of the diffusion mechanism, in
the solid solution affect deeply the early stage morphologies of precipitates. Our
argument is based on a combined use of atomic-scale observations, with atom-probe
tomography (APT) and lattice kinetic Monte Carlo simulation of a Ni(Al,Cr) alloy.
By an optimized choice of thermodynamic and kinetic parameters we first
reproduce the experimental APT observations. We then modify only the long-range
vacancy-solute binding energy, without altering the thermodynamic driving force
for phase separation, thereby demonstrating that the microstructural evolution
changes from a coagulation to an evaporation-condensation coalescence mechanism.
The changes can only be accounted for with nonzero values for the vacancychemical potential and off-diagonal terms of the Onsager matrix, at variance with
classical models. |
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