Influence of radiation-induced segregation on ductility of a nickel-silicon alloy

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Flat tensile specimens 60 ..mu..m thick of Ni-8 at. % Si were irradiated to bulk damage levels of 0.1 to 0.3 dpa with either 7 MeV protons or 28 MeV alpha particles at 750 K. The alpha bombarded specimens incurred 750 at. ppM He per 0.1 dpa in the course of their damage-generating irradiation. Radiation-induced silicon segregation gave rise to Ni/sub 3/Si layers at internal and external surfaces. Postirradiation tensile tests conducted either at 300 K or 720 K revealed fully ductile (chisel-edged) transgranular fracture profiles. There were no significant differences between the proton-bombarded specimens and the unbombarded controls, both ... continued below

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Pages: 17

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Packan, N.H.; Schroeder, H. & Kesternich, W. January 1, 1986.

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Description

Flat tensile specimens 60 ..mu..m thick of Ni-8 at. % Si were irradiated to bulk damage levels of 0.1 to 0.3 dpa with either 7 MeV protons or 28 MeV alpha particles at 750 K. The alpha bombarded specimens incurred 750 at. ppM He per 0.1 dpa in the course of their damage-generating irradiation. Radiation-induced silicon segregation gave rise to Ni/sub 3/Si layers at internal and external surfaces. Postirradiation tensile tests conducted either at 300 K or 720 K revealed fully ductile (chisel-edged) transgranular fracture profiles. There were no significant differences between the proton-bombarded specimens and the unbombarded controls, both exhibiting >25% total elongations, while the alpha-bombarded specimens showed ductile fractures with somewhat lower (17 to 18%) elongation values probably due to hardening caused by small helium bubbles. Certain specimens that were preimplanted with 250 to 1000 at. ppM He at 970 K to encourage intergranular failure and expose grain boundaries did fail intergranularly. It is concluded that radiation-induced silicon segregation does not cause intrinsic embrittlement.

Physical Description

Pages: 17

Notes

NTIS, PC A02/MF A01.

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  • 2. international conference on fusion reactor materials (ICFRM-2), Chicago, IL, USA, 13 Apr 1986

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  • Other: DE86009500
  • Report No.: CONF-860421-26
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 6042965
  • Archival Resource Key: ark:/67531/metadc1094712

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1986

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  • Feb. 18, 2018, 3:59 p.m.

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  • April 4, 2018, 12:43 p.m.

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Packan, N.H.; Schroeder, H. & Kesternich, W. Influence of radiation-induced segregation on ductility of a nickel-silicon alloy, article, January 1, 1986; United States. (digital.library.unt.edu/ark:/67531/metadc1094712/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.