Microstructure and tensile properties of neutron irradiated Cu and Cu5Ni containing isotopically controlled boron

T. Muroga, H. Watanabe, N. Yoshida, H. Kurishita, M. L. Hamilton

Research output: Contribution to journalArticle

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Abstract

Cu and Cu5Ni dopwe with either natural boron (20%10B) or isotopically enriched boron (91%10B) were irradiated in FFTF/MOTA at 646 K to 6.3 dpa and 683 K to 4.9 dpa. The He/dpa ratio varied from 0.1 to 224. The dependence of irradiation-induced microstructures and mechanical properties (yield stress change and uniform elongation) on the helium level was examined. In pure Cu, the void size distribution changed from unimodal to bimodal with the increase of He/dpa ratio. The swelling peak occured at a He/dpa ratio of 5 to 10. In Cu5Ni, the swelling rapidly decreased with He/dpa ratio. The yield stress change was well correlated with microstructural-based calculations describing contributions to hardening by voids and dislocations. Cavity formation and growth at grain boundaries resulted in enhanced grain boundary fracture and significant loss of elongation in the case of high He/dpa ratio. This effect, however, was small at fusion-relevant He/dpa ratio.

Original languageEnglish
Pages (from-to)137-145
Number of pages9
JournalJournal of Nuclear Materials
Volume225
DOIs
Publication statusPublished - Jan 1 1995

Fingerprint

Boron
tensile properties
Tensile properties
swelling
elongation
Yield stress
Swelling
voids
Elongation
Neutrons
Grain boundaries
boron
grain boundaries
neutrons
Helium
microstructure
Microstructure
Dislocations (crystals)
hardening
Hardening

All Science Journal Classification (ASJC) codes

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

Cite this

Microstructure and tensile properties of neutron irradiated Cu and Cu5Ni containing isotopically controlled boron. / Muroga, T.; Watanabe, H.; Yoshida, N.; Kurishita, H.; Hamilton, M. L.

In: Journal of Nuclear Materials, Vol. 225, 01.01.1995, p. 137-145.

Research output: Contribution to journalArticle

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AU - Watanabe, H.

AU - Yoshida, N.

AU - Kurishita, H.

AU - Hamilton, M. L.

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AB - Cu and Cu5Ni dopwe with either natural boron (20%10B) or isotopically enriched boron (91%10B) were irradiated in FFTF/MOTA at 646 K to 6.3 dpa and 683 K to 4.9 dpa. The He/dpa ratio varied from 0.1 to 224. The dependence of irradiation-induced microstructures and mechanical properties (yield stress change and uniform elongation) on the helium level was examined. In pure Cu, the void size distribution changed from unimodal to bimodal with the increase of He/dpa ratio. The swelling peak occured at a He/dpa ratio of 5 to 10. In Cu5Ni, the swelling rapidly decreased with He/dpa ratio. The yield stress change was well correlated with microstructural-based calculations describing contributions to hardening by voids and dislocations. Cavity formation and growth at grain boundaries resulted in enhanced grain boundary fracture and significant loss of elongation in the case of high He/dpa ratio. This effect, however, was small at fusion-relevant He/dpa ratio.

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