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Title: Helium bubbles in niobium and niobium-zirconium alloys
Author: Tyler, Stephen Kenneth
ISNI:       0000 0001 3540 4089
Awarding Body: University of Surrey
Current Institution: University of Surrey
Date of Award: 1979
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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.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available