Proton irradiation effects on beryllium – A macroscopic assessment

Simos, Nikolaos; Elbakhshwan, Mohamed; Zhong, Zhong; Camino, Fernando

doi:10.1016/j.jnucmat.2016.06.048

Title: Proton irradiation effects on beryllium – A macroscopic assessment

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Abstract

Beryllium, due to its excellent neutron multiplication and moderation properties, in conjunction with its good thermal properties, is under consideration for use as plasma facing material in fusion reactors and as a very effective neutron reflector in fission reactors. While it is characterized by unique combination of structural, chemical, atomic number, and neutron absorption cross section it suffers, however, from irradiation generated transmutation gases such as helium and tritium which exhibit low solubility leading to supersaturation of the Be matrix and tend to precipitate into bubbles that coalesce and induce swelling and embrittlement thus degrading the metal and limiting its lifetime. Utilization of beryllium as a pion production low-Z target in high power proton accelerators has been sought both for its low Z and good thermal properties in an effort to mitigate thermos-mechanical shock that is expected to be induced under the multi-MW power demand. To assess irradiation-induced changes in the thermal and mechanical properties of Beryllium, a study focusing on proton irradiation damage effects has been undertaken using 200 MeV protons from the Brookhaven National Laboratory Linac and followed by a multi-faceted post-irradiation analysis that included the thermal and volumetric stability of irradiated beryllium, the stress-strain behavior and itsmore »« less

Authors:

Simos, Nikolaos ^[1]; Elbakhshwan, Mohamed ^[1]; Zhong, Zhong ^[1]; Camino, Fernando ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: Fri Jul 01 00:00:00 EDT 2016

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1337619

Report Number(s):: BNL-112576-2016-JA
Journal ID: ISSN 0022-3115

Grant/Contract Number:: SC00112704

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Nuclear Materials

Additional Journal Information:: Journal Volume: 479; Journal Issue: C; Journal ID: ISSN 0022-3115

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; irradiation damage; thermal cycling; annealing; beryllium

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                    Simos, Nikolaos, Elbakhshwan, Mohamed, Zhong, Zhong, and Camino, Fernando. Proton irradiation effects on beryllium – A macroscopic assessment.  United States: N. p., 2016. 
Web.  doi:10.1016/j.jnucmat.2016.06.048.

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                    Simos, Nikolaos, Elbakhshwan, Mohamed, Zhong, Zhong, & Camino, Fernando. Proton irradiation effects on beryllium – A macroscopic assessment.  United States.  https://doi.org/10.1016/j.jnucmat.2016.06.048

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                    Simos, Nikolaos, Elbakhshwan, Mohamed, Zhong, Zhong, and Camino, Fernando. Fri .  
"Proton irradiation effects on beryllium – A macroscopic assessment".  United States.  https://doi.org/10.1016/j.jnucmat.2016.06.048.  https://www.osti.gov/servlets/purl/1337619.

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@article{osti_1337619,

  title        = {Proton irradiation effects on beryllium – A macroscopic assessment},

  author       = {Simos, Nikolaos and Elbakhshwan, Mohamed and Zhong, Zhong and Camino, Fernando},

  abstractNote = {Beryllium, due to its excellent neutron multiplication and moderation properties, in conjunction with its good thermal properties, is under consideration for use as plasma facing material in fusion reactors and as a very effective neutron reflector in fission reactors. While it is characterized by unique combination of structural, chemical, atomic number, and neutron absorption cross section it suffers, however, from irradiation generated transmutation gases such as helium and tritium which exhibit low solubility leading to supersaturation of the Be matrix and tend to precipitate into bubbles that coalesce and induce swelling and embrittlement thus degrading the metal and limiting its lifetime. Utilization of beryllium as a pion production low-Z target in high power proton accelerators has been sought both for its low Z and good thermal properties in an effort to mitigate thermos-mechanical shock that is expected to be induced under the multi-MW power demand. To assess irradiation-induced changes in the thermal and mechanical properties of Beryllium, a study focusing on proton irradiation damage effects has been undertaken using 200 MeV protons from the Brookhaven National Laboratory Linac and followed by a multi-faceted post-irradiation analysis that included the thermal and volumetric stability of irradiated beryllium, the stress-strain behavior and its ductility loss as a function of proton fluence and the effects of proton irradiation on the microstructure using synchrotron X-ray diffraction. The mimicking of high temperature irradiation of Beryllium via high temperature annealing schemes has been conducted as part of the post-irradiation study. This study focuses on the thermal stability and mechanical property changes of the proton irradiated beryllium and presents results of the macroscopic property changes of Beryllium deduced from thermal and mechanical tests.},

  doi          = {10.1016/j.jnucmat.2016.06.048},

  journal      = {Journal of Nuclear Materials},

  number       = C,

  volume       = 479,

  place        = {United States},

  year         = {Fri Jul 01 00:00:00 EDT 2016},

  month        = {Fri Jul 01 00:00:00 EDT 2016}

}

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