|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||F-6: Irradiation Response of Twin Boundaries in Face-centered Cubic Metals with Low Stacking Fault Energy
||Jin Li, Youxing Chen, Kaiyuan Yu, Cuncai Fan, Haiyan Wang, Xinghang Zhang
|On-Site Speaker (Planned)
Face-centered cubic metals with low stacking fault energy, such as Ag and Cu, are in general vulnerable to high-energy ion irradiation. Recent studies have shown that twin boundaries (TBs) are effective defect sinks in heavy ion irradiated nanotwinned (NT) metals. Here we report on the study on TB affected zone in irradiated NT Ag wherein time accumulative defect density and defect diffusivity are substantially different from those in twin interior. In addition, the distribution of accumulative defect concentrations in NT Ag has a clear dependence on twin thickness, and in certain cases, the trend of distribution is reversed. Moreover, in situ studies also reveal surprising resilience and self-healing of TBs under irradiation. Finally, we show that the irradiation tolerance of NT Ag can be further improved by adding merely 1 at.% of Fe solute atoms into Ag matrix. The potential mechanisms that lead to enhanced radiation tolerance are discussed.
||Planned: Supplemental Proceedings volume