4.8 Article

Competing Kinetics and He Bubble Morphology in W

Journal

PHYSICAL REVIEW LETTERS
Volume 114, Issue 10, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.105502

Keywords

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Funding

  1. U.S. DOE, Office of Science, Office of Fusion Energy Sciences, and Office of Advanced Scientific Computing Research through the Scientific Discovery through Advanced Computing (SciDAC)
  2. U.S. DOE, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
  3. Office of Science of the U.S. DOE [DE-AC02-05CH11231, DE-AC05-00OR22725]
  4. Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. DOE [DE-AC52-O6NA25396]

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The growth process of He bubbles in W is investigated using molecular dynamics and parallel replica dynamics for growth rates spanning 6 orders of magnitude. Fast and slow growth regimes are defined relative to typical diffusion hopping times of W interstitials around the He bubble. Slow growth rates allow the diffusion of interstitials around the bubble, favoring the biased growth of the bubble towards the surface. In contrast, at fast growth rates interstitials do not have time to diffuse around the bubble, leading to a more isotropic growth and increasing the surface damage.

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