Direct observation of size scaling and elastic interaction between nano-scale defects in collision cascades

X. Yi, Andrea Elisabet Sand, D. R. Mason, M. A. Kirk, S. G. Roberts, Kai Henrik Nordlund, S. L. Dudarev

Research output: Contribution to journalArticleScientificpeer-review

58 Citations (Scopus)

Abstract

Using in situ transmission electron microscopy, we have directly observed nano-scale defects formed in ultra-high-purity tungsten by low-dose high-energy self-ion irradiation at 30K. At cryogenic temperature lattice defects have reduced mobility, so these microscope observations offer a window on the initial, primary damage caused by individual collision cascade events. Electron microscope images provide direct evidence for a power-law size distribution of nanoscale defects formed in high-energy cascades, with an upper size limit independent of the incident ion energy, as predicted by Sand et al. (EPL, 103 (2013) 46003). Furthermore, the analysis of pair distribution functions of defects observed in the micrographs shows significant intra-cascade spatial correlations consistent with strong elastic interaction between the defects. Copyright (C) EPLA, 2015

Original languageEnglish
JournalEurophysics Letters
DOIs
Publication statusPublished - May 2015
MoE publication typeA1 Journal article-refereed

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