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Title: Irradiation hardening of pure tungsten exposed to neutron irradiation

Journal Article · · Journal of Nuclear Materials
 [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)

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.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Inst. for Fusion Science (Japan)
Contributing Organization:
Tohoku Univ., Sendai (Japan); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Grant/Contract Number:
AC05-00OR22725; SC0006661; NFE-13-04478
OSTI ID:
1327659
Alternate ID(s):
OSTI ID: 1398842
Journal Information:
Journal of Nuclear Materials, Vol. 480; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 141 works
Citation information provided by
Web of Science

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Cited By (8)

Controlled irradiation hardening of tungsten by cyclic recrystallization journal May 2019
Recent advances in modeling and simulation of the exposure and response of tungsten to fusion energy conditions journal June 2017
Elemental Characterization of Neutron-Irradiated Tungsten Using the GD-OES Technique journal May 2019
PHENIX U.S.-Japan Collaboration Investigation of Thermal and Mechanical Properties of Thermal Neutron–Shielded Irradiated Tungsten journal May 2019
He-ion induced surface morphology change and nanofuzz growth on hot tungsten surfaces journal December 2018
A tungsten-rhenium interatomic potential for point defect studies journal May 2018
Pre-Irradiation Comparison of W-Based Alloys for the PHENIX Campaign: Microstructure, Composition, and Mechanical Properties journal May 2019
Controlled irradiation hardening of tungsten by cyclic recrystallization text January 2019