Defect annihilation at grain boundaries in alpha-Fe. Academic Article uri icon

abstract

  • Understanding radiation responses of Fe-based metals is essential to develop radiation tolerant steels for longer and safer life cycles in harsh reactor environments. Nanograined metals have been explored as self-healing materials due to point-defect recombination at grain boundaries. The fundamental defect-boundary interactions, however, are not yet well understood. We discover that the interactions are always mediated by formation and annealing of chain-like defects, which consist of alternately positioned interstitials and vacancies. These chain-like defects are closely correlated to the patterns of defect formation energy minima on the grain boundary, which depend on specific boundary configurations. Through chain-like defects, a point defect effectively translates large distances, to annihilate with its opposite, thus grain boundaries act as highly efficient defect sinks that cannot saturate under extreme radiation conditions.

published proceedings

  • Sci Rep

altmetric score

  • 9.25

author list (cited authors)

  • Chen, D. i., Wang, J., Chen, T., & Shao, L.

citation count

  • 98

complete list of authors

  • Chen, Di||Wang, Jing||Chen, Tianyi||Shao, Lin

publication date

  • April 2013