|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||A Novel Mechanism for Order Patterning in Alloys Driven by Irradiation
||Pascal Bellon, Calvin R Lear, Robert S. Averback
|On-Site Speaker (Planned)
Irradiation can induce self-organization in alloys, including compositional patterning, as demonstrated by modeling and atomistic kinetic Monte Carlo (KMC) simulations and experiments. Recent experiments in Cu3Au suggest that irradiation can also stabilize patterns of chemical order. KMC simulations and continuum modeling have been performed to investigate possible generic mechanisms responsible for this patterning, considering the 2×2 ordered structure in a binary alloy on a square lattice with first and second nearest-neighbor interactions as a model system. The forced disordering introduced by irradiation is treated as ballistic exchanges between nearest neighbor pairs of atoms. We show that for thermodynamic parameters close to an order-order phase boundary, thermodynamic frustrations can couple with the disorder introduced by ballistic jumps and stabilize at steady state microstructures where multiple long-range ordered domains coexist dynamically. The relevance of this novel mechanism for patterning of order under irradiation in Cu3Au and other alloys is discussed.
||Planned: Supplemental Proceedings volume