Irradiation hardening of pure tungsten exposed to neutron irradiation

Xunxiang Hu, Takaaki Koyanagi, Makoto Fukuda, N. A.P.Kiran Kumar, Lance L. Snead, Brian D. Wirth, Yutai Katoh

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

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). 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.

Original languageEnglish
Pages (from-to)235-243
Number of pages9
JournalJournal of Nuclear Materials
Volume480
DOIs
Publication statusPublished - 2016 Nov 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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    Hu, X., Koyanagi, T., Fukuda, M., Kumar, N. A. P. K., Snead, L. L., Wirth, B. D., & Katoh, Y. (2016). Irradiation hardening of pure tungsten exposed to neutron irradiation. Journal of Nuclear Materials, 480, 235-243. https://doi.org/10.1016/j.jnucmat.2016.08.024