Publication: Annealing of radiation-induced defects in tungsten: Positron annihilation spectroscopy study
Дата
2019
Авторы
Terentyev, D.
Funtikov, Y. V.
Stolbunov, V. S.
Ogorodnikova, O. V.
Dubov, L. Y.
Stepanov, S. V.
Shtotsky, Y. V.
Efimov, V.
Gutorov, K.
Journal Title
Journal ISSN
Volume Title
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Аннотация
© 2019 Elsevier B.V. Positron annihilation lifetime spectroscopy (PALS) was applied to study the annealing of radiation-induced defects in polycrystalline tungsten (W) irradiated with 21.6 MeV protons at 100 °C up to a fluence of 5 × 10 15 p/cm 2 . Three components were observed in the measured spectra: short-lifetime of 100–120 ps (positron annihilation in the defect-free W lattice), medium-lifetime of ∼190–330 ps (annihilation at mono-vacancies and small vacancy cluster containing ∼ 2–4 vacancies) and long-lifetime of ∼500 ps (annihilation in large vacancy clusters containing more than 10 vacancies). The irradiation of W with protons at 100 °C, primary, led to the formation of mono-vacancies, self-interstitial defects were created as well but migrated towards sinks during the irradiation. Onset of vacancy diffusion in W starts already at 200 °C before defect recovery stage III. After annealing at ∼400 °C, a sharp drop in the intensity of the positron medium-life component together with a simultaneous increase in positron lifetime from ∼220 to ∼280 ps is observed, and a long-life component appears. This indicates migration and annealing of vacancies and their agglomeration in large vacancy clusters. After annealing at 500–700C, the intensity of long-life component increases indicating the growth of large vacancy clusters but at 900 °C they anneal completely as the mean lifetime recovers nearly to the value measured in the un-irradiated material.
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Цитирование
Annealing of radiation-induced defects in tungsten: Positron annihilation spectroscopy study / Terentyev, D. [et al.] // Journal of Nuclear Materials. - 2019. - 517. - P. 148-151. - 10.1016/j.jnucmat.2019.02.010
URI
https://www.doi.org/10.1016/j.jnucmat.2019.02.010
https://www.scopus.com/record/display.uri?eid=2-s2.0-85061742245&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000461048800016
https://openrepository.mephi.ru/handle/123456789/16575
https://www.scopus.com/record/display.uri?eid=2-s2.0-85061742245&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000461048800016
https://openrepository.mephi.ru/handle/123456789/16575