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Title: Helium bubble evolution in a Zr–Sn–Nb–Fe–Cr alloy during post-annealing: An in-situ investigation

The formation of helium bubbles is considered to be detrimental to the mechanical performance of the nuclear materials. The growth behaviors of helium bubbles in a helium ion implanted Zr–Sn–Nb–Fe–Cr alloy with respect to the helium fluence and subsequently annealing procedure were investigated by in-situ transmission electron microscopy. In the as-implanted sample, the measured size distributions of the helium bubbles are consistent with the simulated helium concentrations. Moreover, the mean size of the helium bubbles increases with the increase of the irradiation temperatures and the helium fluence. The in-situ heating study performed in a transmission electron microscope indicates that the mean size of the helium bubbles increase slowly below 923 K and dramatically above 923 K. The coarsening mechanism of the helium bubbles in the alloy is suggested based on the study. - Highlights: • Helium bubble growth in zirconium with annealing was in-situ investigated in TEM. • The mean helium bubble size increase with helium fluence and annealing temperature. • Helium bubble size distribution is same as that of helium concentration by SRIM. • Mean bubble size increases slowly and quickly with temperature below and above 923 K. • The growth mechanism of the helium bubbles in Zr alloymore » has been discussed.« less
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ; ;  [3] ;  [1] ;  [5] ;  [1]
  1. School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054 (China)
  2. (United States)
  3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900 (China)
  4. Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109 (United States)
  5. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109 (United States)
Publication Date:
OSTI Identifier:
22476174
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 107; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOY SYSTEMS; ANNEALING; CHROMIUM COMPOUNDS; DISTRIBUTION; HEATING; HELIUM; IRON COMPOUNDS; IRRADIATION; NIOBIUM COMPOUNDS; PERFORMANCE; SIMULATION; TIN COMPOUNDS; TRANSMISSION ELECTRON MICROSCOPY; ZIRCONIUM COMPOUNDS