Enhanced formation of &lt;1 0 0&gt; and &lt;1 1 1&gt; interstitial loops by helium clustering in bcc iron

Yang, Li; Liu, H.; Zhou, Hui; Peng, Shu Ming; Long, Xiao; Zhou, Xiaosong; Zu, Xu; Gao, Fei

doi:10.1016/j.matlet.2017.01.024

Cited by 8 publications

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All these mechanisms assume thermodynamic equilibrium conditions and some precursors. Stimulations like stress 22 , temperature 9 , and impurities (carbon 17 , chromium 11 , helium 23 , etc) could change the relative stability of <100> over <111> clusters, and the rate of reaction or transformation, but not enough to explain their common occurrence of <100> loops under irradiation 17 . Nevertheless, all these proposed mechanisms require a long time (i.e.…”

Section: Introductionmentioning

confidence: 99%

Shockwave generates < 100 > dislocation loops in bcc iron

et al. 2018

View full text Add to dashboard Cite

The formation mechanism of < 100 > interstitial dislocation loops in ferritic steels stemming from irradiation remains elusive, as their formations are either too short for experiments, or too long for molecular dynamics simulations. Here, we report on the formation of both interstitial and vacancy dislocation loops in high energy displacement cascades using large-scale molecular dynamics simulations with up to 220 million atoms. Riding the supersonic shockwave generated in the cascade, self-interstitial atoms are punched out to form < 100 > dislocation loops in only a few picoseconds during one single cascade event, which is several orders of magnitude faster than any existing mechanisms. The energy analysis suggests that the formation of the interstitial loops depends on kinetic energy redistribution, where higher incidence energy or larger atom mass could improve the probability of the direct nucleation of interstitial dislocation loops.

show abstract