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Helium bubbles in niobium and niobium-zirconium alloys.

Tyler, Stephen Kenneth. (1979) Helium bubbles in niobium and niobium-zirconium alloys. Doctoral thesis, University of Surrey (United Kingdom)..

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-10 J/m, and 4.3 x 10[-11] J/m,are deduced for Nb-0.3%Zr, Nb[-1]%Zr, and Nb-2.07%Zr , respectively, at 1050 °C . A value of 1 x 10[-10] J/m was determined for Nb -1 %Zr at 950 °C. These values are greater than those deduced for Nb because the presence of Zirconium effectively cleanses bubble surfaces of interstitial impurities. Bubbles in Nb-0.3%Zr and Nb-1%Zr at 1050 °C exhibit a breakaway/re-saturation phenomenon which, it is suggested, is caused by Zr-interstitial segregation effects . An ordering phenomenon that significantly influences bubble growth was observed in Nb-1%Zr at 1250 C. Finally, bubbles become overpressurized during annealing, and this has an important bearing on the morphological changes of bubbles with time at temperature.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
Tyler, Stephen Kenneth.
Date : 1979
Contributors :
Additional Information : Thesis (Ph.D.)--University of Surrey (United Kingdom), 1979.
Depositing User : EPrints Services
Date Deposited : 22 Jun 2018 14:27
Last Modified : 06 Nov 2018 16:53

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