|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Computational Materials Engineering for Nuclear Reactor Applications
||Enhanced Helium Clustering Process in Iron
||Zuya Huang, Brian David Wirth, Xunxiang Hu, Mary Alice Cusentino
|On-Site Speaker (Planned)
Fe-based alloys are important structural materials for fission and fusion energy. For fusion applications, the challenges of radiation-induced change in microstructure, properties and performance is further challenged by the concomitant production of helium from (n, alpha) reactions with high-energy neutrons. In this study, we have used molecular dynamics simulations to investigate the synergistic interactions of helium and prismatic dislocation loops in modifying the helium clustering and gas bubble nucleation process. In particular, we have investigated the role of a/2<111> or a<100> prismatic interstitial type dislocation loops on the helium clustering dynamics upon inserting interstitial helium into the body-centered cubic iron lattice at temperatures from 773 to 1173 °K. The simulations indicate a strong elastic interaction between the dislocation loops and the helium, which significantly influence bubble nucleation. The results of the atomistic simulations will be discussed in the larger context of modeling microstructural evolution in a fusion neutron environment.
||Planned: A print-only volume