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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Fundamental Science of Microstructural Evolution and Phase Transformations: An MPMD/FMD/SMD Symposium in Honor of Peter Voorhees
Presentation Title Ostwald Ripening: Lifshitz-Slyozov (LS) non-linear kinetic equations for describing phase separation in different two-phase nickel-based alloys
Author(s) David N. Seidman
On-Site Speaker (Planned) David N. Seidman
Abstract Scope We present experimental studies of phase-separation in Ni-Al, Ni-Al-Cr, and Ni-Al-Cr-Re alloys, which exhibit precipitation of gamma-prime (L12) in a gamma-matrix (f.c.c.) as a function of time and temperature. Our experimental studies employ atom-probe tomography, transmission electron microscopy, and to a certain extent vacancy mediated lattice kinetic Monte Carlo (LKMC) simulations. The mechanism for coarsening is observed to be coagulation-coalescence as opposed to the evaporation-condensation mechanism (LS model), due to a high number density of gamma-prime (L12) precipitates, ten-to-the 24 per cubic meter, peak value. It is shown that the linearization of the three basic LS equations leads to erroneous values of the temporal exponents of these basic equations. The temporal exponents need to be measured in the regime where the volume fraction of the gamma-prime (L12) phase is asymptotically approaching a constant value. No experimental evidence is found for non-integral values of the temporal exponents.
Proceedings Inclusion? Planned:
Keywords Phase Transformations, Characterization, Modeling and Simulation

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