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Blavette, D.; Soisson, F.; Martin, G.; Pareige, C. |
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Ordering and Phase Separation in Model Superalloys: 3D Atom Probe versus Monte Carlo simulation |
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1999 |
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Abstract |
Proceedings of the International Conference on Solid-Solid Phase Transformations |
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65-72 |
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ordering, phase separation, Ni-Al-Cr, 3D atom-probe, monte carlo simulation; 3D Atom Probe, Superalloys |
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Abbreviated Series Title |
The kinetics of ordering and unmixing in model superalloys (NiCrAl) at 600C were
effects in the ' investigated at the atomic scale using 3D atom probe and by transmission electron
it ion here that microscopy. Very fine precipitates (lnm) with a well ordered structure (Ni3 Al) were
observed in the early stages of growth At this stage, their composition was found very close
to the equilibrium composition of the y' phase. Coarsening of y' precipitates was observed in
the early stages, for particle radius under 2 nm Monte Carlo simulations of kinetics based on
a atom-vacancy exchanges mechanism and using a residence time algorithm were also
conducted. Experiments and simulations have shown a good agreement. Monte carlo
simulations indicate that short range ordering of both Al and Cr precedes the nucleation and
Ni3AI ordered phase. The Cr content in nuclei was foun: to be close to that of
solution in the very early stages of phase separation |
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NU @ karnesky @ |
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275 |
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