|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||Void Superlattice Formation: Symmetry and Lattice Parameter Selection
||Yongfeng Zhang, Yipeng Gao, Chao Jiang , Daniel Schwen
|On-Site Speaker (Planned)
Void and gas bubble superlattices have been widely observed in various types of materials under irradiation, with the formation mechanisms still open for debate. The superlattices feature certain crystal symmetry, usually coherent with the matrix with rare exceptions, and a characteristic length – lattice parameter, which varies with materials and irradiation conditions. By combining atomic kinetic Monte Carlo and theoretical analysis, it is shown that lattice symmetry is dictated by anisotropic materials properties such as one-dimensional interstitial diffusion, and that the lattice parameter is determined by the critical condition for spontaneous phase separation, which depends on defect kinetics. The theoretical analysis gives an analytical prediction for lattice parameter as a function of materials properties and irradiation conditions, and the results are in good agreement with experiments and simulations. The developed theory may have general application in cases involving spontaneous phase transition and anisotropic diffusion reaction.
||Planned: Supplemental Proceedings volume