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Title: Dynamic Void Growth and Shrinkage in Mg under Electron Irradiation

We report in-situ atomic-scale investigation of void evolution, including growth, coalescence and shrinkage, under electron irradiation. With increasing irradiation dose, the total volume of voids increased linearly, while nucleation rate of new voids decreased slightly, and the total number of voids decreased. Some voids continued to grow while others shrank to disappear, depending on the nature of their interactions with nearby self-interstitial loops. For the first time, surface diffusion of adatoms was observed largely responsible for the void coalescence and thickening. These findings provide fundamental understanding to help with the design and modeling of irradiation-resistant materials.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [4] ;  [1]
  1. North Carolina State Univ., Raleigh, NC (United States). Dept. of Materials Science and Engineering
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. Univ. of Arkansas, Fayetteville, AR (United States). Dept. of Mecanical Engineering
  4. U.S. Army Research Office, Research Triangle Park, NC (United States). Materials Science Division
Publication Date:
OSTI Identifier:
1179092
Report Number(s):
INL/JOU-14-31014
Journal ID: ISSN 2166-3831; TRN: US1500192
DOE Contract Number:
AC07-05ID14517
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Letters; Journal Volume: 2; Journal Issue: 3
Publisher:
Taylor & Francis
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PHYSICAL RADIATION EFFECTS; ELECTRONS; VOIDS; SHRINKAGE; RADIATION DOSES; COALESCENCE; DIFFUSION; MAGNESIUM; NUCLEATION; SURFACES; ADSORPTION; AUGMENTATION HCP MG; HIGH-RESOLUTION TEM; NUCLEATION AND GROWTH