Segregation and second phase formation at free surfaces during irradiation

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From surface effects in controlled thermonuclear fusion devices and reactors meeting; Argonne, Illinois, USA (10 Jan 1974). Transmission electron microscopy examinations of a number of fcc and bcc metals and alloys irradiated either by heavy-ions or high energy electrons have shown that dynamic interactions of displacement damage with impurities and alloying elements lead to segregation and/or to the formation of second phases at internal surfaces such as voids. The phenomenon has been observed in an experimental 18 Cr-8 Ni-1 Si stainless steel, in commercial 316L stainless steel, in vanadium, and in nickel. Results of analysis of the segregation-induced strain field ... continued below

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Okamoto, P.R.; Wiedersich, H. & Das, S.K. January 1, 1974.

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From surface effects in controlled thermonuclear fusion devices and reactors meeting; Argonne, Illinois, USA (10 Jan 1974). Transmission electron microscopy examinations of a number of fcc and bcc metals and alloys irradiated either by heavy-ions or high energy electrons have shown that dynamic interactions of displacement damage with impurities and alloying elements lead to segregation and/or to the formation of second phases at internal surfaces such as voids. The phenomenon has been observed in an experimental 18 Cr-8 Ni-1 Si stainless steel, in commercial 316L stainless steel, in vanadium, and in nickel. Results of analysis of the segregation-induced strain field around the voids indicate that irradiation produces an enrichment of elements with negative size factors and/or depletion of elements with positive size factors. Results of Auger spectroscopic analysis indicates a similar segregation phenomenon occurs at the external irradiated surface in 18 Cr--8Ni-1 Si stainless steel. A comparison of the Auger spectra from surfaces of unirradiated and irradiated samples show that irradiation produces an increase in the nickel and silicon concentration but a decrease in the chromium concentration. Nickel and silicon have negative size factors while for chromium, it is positive. These results suggest that undersized substitutionai elements may tend to preferentially interchange positions with oversized solutes in interstitial sites, and that transport by interstitials may dominate segretation to defect sinks. (auth)

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Pages: 22

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  • Surface effects in controlled thermonuclear fusion devices and reactors meeting, Argonne, Illinois, USA, 10 Jan 1974

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  • Report No.: CONF-740104--16
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4305736
  • Archival Resource Key: ark:/67531/metadc1022564

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

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1974

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  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 27, 2017, 2:27 p.m.

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Okamoto, P.R.; Wiedersich, H. & Das, S.K. Segregation and second phase formation at free surfaces during irradiation, article, January 1, 1974; Illinois. (digital.library.unt.edu/ark:/67531/metadc1022564/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.