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Title: Irradiation hardening of pure tungsten exposed to neutron irradiation

Abstract

In this paper, pure tungsten samples have been neutron irradiated in HFIR at 90–850 °C to 0.03–2.2 dpa. A dispersed barrier hardening model informed by the available microstructure data has been used to predict the hardness. Comparison of the model predictions and the measured Vickers hardness reveals the dominant hardening contribution at various irradiation conditions. For tungsten samples irradiated in HFIR, the results indicate that voids and dislocation loops contributed to the hardness increase in the low dose region (<0.3 dpa), while the formation of intermetallic second phase precipitation, resulting from transmutation, dominates the radiation-induced strengthening beginning with a relatively modest dose (>0.6 dpa). Finally, the precipitate contribution is most pronounced for the HFIR irradiations, whereas the radiation-induced defect cluster microstructure can rationalize the entirety of the hardness increase observed in tungsten irradiated in the fast neutron spectrum of Joyo and the mixed neutron spectrum of JMTR.

Authors:
 [1];  [1];  [2];  [1];  [3];  [4];  [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)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); National Inst. for Fusion Science (Japan)
Contributing Org.:
Tohoku Univ., Sendai (Japan); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
OSTI Identifier:
1327659
Alternate Identifier(s):
OSTI ID: 1398842
Grant/Contract Number:  
AC05-00OR22725; SC0006661; NFE-13-04478
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 480; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Hu, Xunxiang, Koyanagi, Takaaki, Fukuda, Makoto, Kumar, N. A. P. Kiran, Snead, Lance L., Wirth, Brian D., and Katoh, Yutai. Irradiation hardening of pure tungsten exposed to neutron irradiation. United States: N. p., 2016. Web. doi:10.1016/j.jnucmat.2016.08.024.
Hu, Xunxiang, Koyanagi, Takaaki, Fukuda, Makoto, Kumar, N. A. P. Kiran, Snead, Lance L., Wirth, Brian D., & Katoh, Yutai. Irradiation hardening of pure tungsten exposed to neutron irradiation. United States. doi:10.1016/j.jnucmat.2016.08.024.
Hu, Xunxiang, Koyanagi, Takaaki, Fukuda, Makoto, Kumar, N. A. P. Kiran, Snead, Lance L., Wirth, Brian D., and Katoh, Yutai. Fri . "Irradiation hardening of pure tungsten exposed to neutron irradiation". United States. doi:10.1016/j.jnucmat.2016.08.024. https://www.osti.gov/servlets/purl/1327659.
@article{osti_1327659,
title = {Irradiation hardening of pure tungsten exposed to neutron irradiation},
author = {Hu, Xunxiang and Koyanagi, Takaaki and Fukuda, Makoto and Kumar, N. A. P. Kiran and Snead, Lance L. and Wirth, Brian D. and Katoh, Yutai},
abstractNote = {In this paper, pure tungsten samples have been neutron irradiated in HFIR at 90–850 °C to 0.03–2.2 dpa. A dispersed barrier hardening model informed by the available microstructure data has been used to predict the hardness. Comparison of the model predictions and the measured Vickers hardness reveals the dominant hardening contribution at various irradiation conditions. For tungsten samples irradiated in HFIR, the results indicate that voids and dislocation loops contributed to the hardness increase in the low dose region (<0.3 dpa), while the formation of intermetallic second phase precipitation, resulting from transmutation, dominates the radiation-induced strengthening beginning with a relatively modest dose (>0.6 dpa). Finally, the precipitate contribution is most pronounced for the HFIR irradiations, whereas the radiation-induced defect cluster microstructure can rationalize the entirety of the hardness increase observed in tungsten irradiated in the fast neutron spectrum of Joyo and the mixed neutron spectrum of JMTR.},
doi = {10.1016/j.jnucmat.2016.08.024},
journal = {Journal of Nuclear Materials},
number = ,
volume = 480,
place = {United States},
year = {Fri Aug 26 00:00:00 EDT 2016},
month = {Fri Aug 26 00:00:00 EDT 2016}
}

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