Shockwave generates dislocation loops in bcc iron

Qing Peng (), Fanjiang Meng, Yizhong Yang, Chenyang Lu (), Huiqiu Deng (), Lumin Wang, Suvranu De and Fei Gao
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Qing Peng: University of Michigan
Fanjiang Meng: University of Michigan
Yizhong Yang: University of Michigan
Chenyang Lu: University of Michigan
Huiqiu Deng: Hunan University
Lumin Wang: University of Michigan
Suvranu De: Rensselaer Polytechnic Institute
Fei Gao: University of Michigan

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract The formation mechanism of 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 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.

Date: 2018
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DOI: 10.1038/s41467-018-07102-3

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