|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Materials Science and Engineering for Nuclear Energy
||A Phase Field Study of Void Superlattice Formation in Irradiated Materials
||Yipeng Gao, Daniel Schwen, Chao Jiang, Yongfeng Zhang
|On-Site Speaker (Planned)
The void superlattice formation under irradiation is a unique self-organizing phenomenon, which affects volumetric swelling and thus the behaviors of nuclear materials. We develop a phase field model to investigate the formation mechanism of void superlattice, and the effects of materials properties and irradiation condition. It is found that the long-range ordering of superlattice is driven by short-range interaction combined with kinetic anisotropy. In particular, the symmetry of the lattice is dictated by the anisotropic diffusion of interstitial atoms, while the lattice parameter is determined by the instability of vacancy concentration waves. The spatial distributions of vacancies and interstitials are strongly coupled through recombination, which leads to the formation of self-organized superlattice. This study provides a new insight into the understanding irradiation-induced self-organization phenomena, from both thermodynamic and kinetic point of view.
||Planned: Supplemental Proceedings volume