Neutron energy spectrum influence on irradiation hardening and microstructural development of tungsten

Fukuda, Makoto; Kiran Kumar, N. A. P.; Koyanagi, Takaaki; Garrison, Lauren M.; Snead, Lance L.; Katoh, Yutai; Hasegawa, Akira

doi:10.1016/j.jnucmat.2016.06.051

Title: Neutron energy spectrum influence on irradiation hardening and microstructural development of tungsten

Journal Article · Sat Jul 02 00:00:00 EDT 2016 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2016.06.051· OSTI ID:1279401

^[1]; Kiran Kumar, N. A. P. ^[2]; Koyanagi, Takaaki ^[2]; Garrison, Lauren M. ^[2]; Snead, Lance L. ^[3]; Katoh, Yutai ^[2]; Hasegawa, Akira ^[1]

Tohoku Univ., Sendai (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

We performed a neutron irradiation to single crystal pure tungsten in the mixed spectrum High Flux Isotope Reactor (HFIR). In order to investigate the influences of neutron energy spectrum, the microstructure and irradiation hardening were compared with previous data obtained from the irradiation campaigns in the mixed spectrum Japan Material Testing Reactor (JMTR) and the sodium-cooled fast reactor Joyo. The irradiation temperatures were in the range of ~90–~800 °C and fast neutron fluences were 0.02–9.00 × 10²⁵ n/m² (E > 0.1 MeV). Post irradiation evaluation included Vickers hardness measurements and transmission electron microscopy. Moreover, the hardness and microstructure changes exhibited a clear dependence on the neutron energy spectrum. The hardness appeared to increase with increasing thermal neutron flux when fast fluence exceeds 1 × 10²⁵ n/m² (E > 0.1 MeV). Finally, irradiation induced precipitates considered to be χ- and σ-phases were observed in samples irradiated to >1 × 10²⁵ n/m² (E > 0.1 MeV), which were pronounced at high dose and due to the very high thermal neutron flux of HFIR. Although the irradiation hardening mainly caused by defects clusters in a low dose regime, the transmutation-induced precipitation appeared to impose additional significant hardening of the tungsten.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; 15H06030

OSTI ID:: 1279401

Alternate ID(s):: OSTI ID: 1359425

Journal Information:: Journal of Nuclear Materials, Vol. 479, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 53 works

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Cited By (4)

Controlled irradiation hardening of tungsten by cyclic recrystallization Mannheim, A.; van Dommelen, J. A. W.; Geers, M. G. D. Modelling and Simulation in Materials Science and Engineering, Vol. 27, Issue 6 https://doi.org/10.1088/1361-651x/ab1eec	journal	May 2019
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Pre-Irradiation Comparison of W-Based Alloys for the PHENIX Campaign: Microstructure, Composition, and Mechanical Properties Lang, Eric; Reid, Nathan; Garrison, Lauren Fusion Science and Technology, Vol. 75, Issue 6 https://doi.org/10.1080/15361055.2019.1602400	journal	May 2019
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