|About this Abstract
||2010 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||Compositional Patterning and Morphological Evolutions in Binary and Ternary Alloys Driven by Irradiation
||Pascal Bellon, Anoop Rama Damodaran, Daniel Schwen, Robert S Averback
|On-Site Speaker (Planned)
The dynamical competition between irradiation-induced atomic mixing and thermally activated decomposition can induce the self-organization of the composition field into patterns. Analytical modeling and atomistic simulations works showed that a key requirement for this self-organization is that the forced mixing takes place at a finite range exceeding the characteristic range of diffusional jumps. We extend past kinetic Monte-Carlo approaches to multi-component alloy systems, and we investigate the effects of composition-dependent atomic mobility. In the case of slow solute mobility, it is shown that precipitates stabilized by irradiation may develop a "cherry-pit" structure. In the case of ternary and quaternary alloys, we show that, compared to binary alloys, several new nanostructures can be stabilized, in particular core-shell precipitates. These results will be contrasted with available experimental results.
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