High-energy collision cascades in tungsten: Dislocation loops structure and clustering scaling laws

By A. Sand, S. Dudarev, Kai Nordlund. 2013

229 citations recorded by the source corpus.

Recent experiments on in situ high-energy self-ion irradiation of tungsten (W) show the occurrence of unusual cascade damage effects resulting from single-ion impacts, shedding light on the nature of radiation damage expected in the tungsten components of a fusion reactor. In this paper, we investigate the dynamics of defect production in 150 keV collision cascades in W at atomic resolution, using molecular-dynamics simulations and comparing predictions with experimental observations. We show that cascades in W exhibit no subcascade break-up even at high energies, producing a massive, unbroken molten area, which facilitates the formation of large defect clusters. Simulations show evidence of the formation of both and interstitial-type dislocation loops, as well as the occurrence of cascade collapse resulting in vacancy-type dislocation loops, in excellent agreement with experimental observations. The fractal nature of the cascades gives rise to a scale-less power-law–type size distribution of defect clusters.

Subfields: Computational Mechanics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/a0dbd47fd17e8ca88451cb02ee840cfd2d9e358c

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In Computational Mechanics

In Materials Chemistry

Citations in the corpus

Primary radiation damage: A review of current understanding and models (2018, background): “These have been found to closely follow power laws [102,103].”
Characterisation of radiation damage in W and W-based alloys from 2 MeV self-ion near-bulk implantations (2015, background): “Damage evolution in stage II irradiations largely involves the growth of interstitial clusters towards visible loops and the disappearance of smaller clusters in favour of larger ones; clusters of interstitials, including small loops, may be produced directly within cascades [19].”
Loop and void damage during heavy ion irradiation on nanocrystalline and coarse grained tungsten: Microstructure, effect of dpa rate, temperature, and grain size (2018, methodology): “[49] 150 keV self ions MD simulations with D-D”