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Title: Microstructural evolution of pure tungsten neutron irradiated with a mixed energy spectrum

Here, microstructures of single-crystal bulk tungsten (W) and polycrystalline W foil with a strong grain texture were investigated using transmission electron microscopy following neutron irradiation at ~90–800 °C to 0.03–4.6 displacements per atom (dpa) in the High Flux Isotope Reactor with a mixed energy spectrum. The dominant irradiation defects were dislocation loops and small clusters at ~90 °C. Additional voids were formed in W irradiated at above 460 °C. Voids and precipitates involving transmutation rhenium and osmium were the dominant defects at more than ~1 dpa. We found a new phenomenon of microstructural evolution in irradiated polycrystalline W: Re- and Os-rich precipitation along grain boundaries. Comparison of results between this study and previous studies using different irradiation facilities revealed that the microstructural evolution of pure W is highly dependent on the neutron energy spectrum in addition to the irradiation temperature and dose.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Tohoku Univ., Sendai (Japan)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 490; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1357970
Alternate Identifier(s):
OSTI ID: 1396918

Koyanagi, Takaaki, Kumar, N. A. P. Kiran, Hwang, Taehyun, Garrison, Lauren M., Hu, Xunxiang, Snead, Lance L., and Katoh, Yutai. Microstructural evolution of pure tungsten neutron irradiated with a mixed energy spectrum. United States: N. p., Web. doi:10.1016/j.jnucmat.2017.04.010.
Koyanagi, Takaaki, Kumar, N. A. P. Kiran, Hwang, Taehyun, Garrison, Lauren M., Hu, Xunxiang, Snead, Lance L., & Katoh, Yutai. Microstructural evolution of pure tungsten neutron irradiated with a mixed energy spectrum. United States. doi:10.1016/j.jnucmat.2017.04.010.
Koyanagi, Takaaki, Kumar, N. A. P. Kiran, Hwang, Taehyun, Garrison, Lauren M., Hu, Xunxiang, Snead, Lance L., and Katoh, Yutai. 2017. "Microstructural evolution of pure tungsten neutron irradiated with a mixed energy spectrum". United States. doi:10.1016/j.jnucmat.2017.04.010. https://www.osti.gov/servlets/purl/1357970.
@article{osti_1357970,
title = {Microstructural evolution of pure tungsten neutron irradiated with a mixed energy spectrum},
author = {Koyanagi, Takaaki and Kumar, N. A. P. Kiran and Hwang, Taehyun and Garrison, Lauren M. and Hu, Xunxiang and Snead, Lance L. and Katoh, Yutai},
abstractNote = {Here, microstructures of single-crystal bulk tungsten (W) and polycrystalline W foil with a strong grain texture were investigated using transmission electron microscopy following neutron irradiation at ~90–800 °C to 0.03–4.6 displacements per atom (dpa) in the High Flux Isotope Reactor with a mixed energy spectrum. The dominant irradiation defects were dislocation loops and small clusters at ~90 °C. Additional voids were formed in W irradiated at above 460 °C. Voids and precipitates involving transmutation rhenium and osmium were the dominant defects at more than ~1 dpa. We found a new phenomenon of microstructural evolution in irradiated polycrystalline W: Re- and Os-rich precipitation along grain boundaries. Comparison of results between this study and previous studies using different irradiation facilities revealed that the microstructural evolution of pure W is highly dependent on the neutron energy spectrum in addition to the irradiation temperature and dose.},
doi = {10.1016/j.jnucmat.2017.04.010},
journal = {Journal of Nuclear Materials},
number = C,
volume = 490,
place = {United States},
year = {2017},
month = {4}
}