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Title: Helium bubble bursting in tungsten

Molecular dynamics simulations have been used to systematically study the pressure evolution and bursting behavior of sub-surface helium bubbles and the resulting tungsten surface morphology. This study specifically investigates how bubble shape and size, temperature, tungsten surface orientation, and ligament thickness above the bubble influence bubble stability and surface evolution. The tungsten surface is roughened by a combination of adatom “islands,” craters, and pinholes. The present study provides insight into the mechanisms and conditions leading to various tungsten topology changes, which we believe are the initial stages of surface evolution leading to the formation of nanoscale fuzz.
Authors:
 [1] ;  [2] ;  [3]
  1. University of California, Berkeley, California 94720 (United States)
  2. University of Tennessee, Knoxville, Tennessee 37996 (United States)
  3. University of Tennessee, Oak Ridge National Laboratory, Knoxville, Tennessee 37996 (United States)
Publication Date:
OSTI Identifier:
22267761
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; BUBBLES; CRATERS; HELIUM; MOLECULAR DYNAMICS METHOD; MORPHOLOGY; NANOSTRUCTURES; ORIENTATION; THICKNESS; TUNGSTEN