|About this Abstract
||Materials Science & Technology 2011
||Phase Stability, Diffusion, Kinetics and their Applications (PSDK-VI)
||Size Induced Transition from Partitioning to Non-Partitioning Local Equilibrium Kinetics in the Precipitation of Carbide Nano-Particles and Subsequent Formation of Transient Bimodal Particle Size Distribution
||Qing Chen, Gustaf Sterner, Herng-Jeng Jou, Anders Engström
|On-Site Speaker (Planned)
While it is well known that phase transformation can undergo transitions among partitioning, non-partitioning local equilibrium, and para-equilibrium by varying composition or temperature in fast diffuser containing ternary or high order systems such as steels, it has not been realized until recently that size effect could also cause such transitions. In this presentation, we use Hillert’s thermodynamic approach to show how size induced Gibbs Thomson effect could generate a mode transition from partitioning local equilibrium to non-partitioning local equilibrium during the birth and growth of a carbide nano-particle. We then verify this possibility by DICTRA kinetic simulations. Finally, we predict for the first time by using TC-PRISMA, a newly developed computational tool for precipitation kinetic modelling, that such a transition can result in a transient bimodal particle size distribution under isothermal condition.
||Definite: A CD-only volume