You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass

    Nucleation of Helium Bubbles at Grain Boundaries During Irradiation

    Published: 01 January 1990

      Format Pages Price  
    PDF (308K) 17 $25   ADD TO CART
    Complete Source PDF (18M) 672 $247   ADD TO CART

    Cite this document

    X Add email address send
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word


    Experimental results are used to determine the dependence of bubble density, at grain boundaries as well as within the grains, on irradiation temperature and helium gen eration rate. The measured flux of helium to grain boundaries is then related to helium generation rate. Finally, the dependence of the grain boundary bubble density on helium flux is obtained. These dependencies point to a possibility that under irradiation the diffusion kinetics of helium during the bubble nucleation phase may be material independent.

    Analytical calculations are made to determine these dependencies. In these calculations, the nucleation at the boundary and within the grains is considered to be coupled. The comparison of the calculated and experimental results shows that the dependence of the average flux of helium on the helium generation rate can be predicted reasonably accurately within the framework of the diatomic type nucleation. The nucleation behavior at grain boundaries has been calculated using diatomic and multi-atomic type mechanisms. Dependencies calculated in terms of the multi-atomic type nucleation are found to be consistent with the observed nucleation behavior at grain boundaries.


    helium, diffusion, bubble, nucleation, grain interior, grain boundaries, irradiation, different materials, helium production rate, helium flux

    Author Information:

    Singh, BN
    Senior research scientist, Risø National Laboratory, Roskilde,

    Foreman, AJE
    Principal scientific officer, Harwell Laboratory, Didcot, Oxfordshire

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP24669S