|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Materials Science and Engineering for Nuclear Energy
||Molecular Dynamics Study of Irradiation Damage in Nano-grain Sized Polycrystal
||Peyman Saidi, Cong Dai, Zhongwen Yao, Mark R Daymond
|On-Site Speaker (Planned)
The ability of a material to resist radiation damage is determined by how well the microstructure can remove vacancies and interstitial defects in equal numbers. However, the exact processes by which this occurs are not well understood. Collision cascades create point defects within the material, with residual vacancies and interstitials resulting in damage structures that eventually cause growth, swelling and embrittlement, degrading mechanical behavior and leading to failure. Grain boundaries are known to be a major sink for point defects. However, the difference between the flux of interstitials and vacancies toward grain boundaries causes an imbalance between vacancies and interstitials. This study investigates the influence of grain size, grain orientation and normalized grain boundary energy on the accumulation mechanisms of point defects which result from the cascades. This enhances our ability to predict irradiation growth, swelling and creep.
||Planned: Supplemental Proceedings volume