STP782

    Asymmetric Dislocation/Point-Defect Interactions and the Modeling of Void Swelling

    Published: Jan 1982


      Format Pages Price  
    PDF (172K) 15 $25   ADD TO CART
    Complete Source PDF (19M) 15 $77   ADD TO CART


    Abstract

    An internally consistent model has been developed for analyzing void swelling during irradiation. The model employs Wigner-Seitz cells around each type of sink, namely dislocation lines, voids, and grain boundaries. Uniform generation of vacancies and interstitials is accounted for, as is diffusion in response to both concentration and radial interaction field gradients. The cells are coupled by equating concentrations and current flows at their peripheries, for arbitrary densities of the various types of sinks.

    A procedure has been developed for obtaining the “best” radial interaction fields to replace the actual angularly dependent ones surrounding dislocations. Analytical theoretical support for the chosen value (−1/4 of the average of the square of the actual field) has been developed. Quantitative accuracy has been assessed by comparison with numerical studies employing full angular dependence.

    The predicted swelling-rate bias factor of ∼50% is in excellent agreement with available swelling-rate data when one assumes that ∼16% of the defects initially generated escape close-pair recombination within the cascade. Reasonable theoretical support exists for this survival fraction. However, quantitatively valid comparisons between theory and experiment must await further analysis.

    Keywords:

    radiation, interstitial, vacancy, dislocations, voids, interaction fields, swelling


    Author Information:

    Liu, YY
    Nuclear Engineer and Senior Technical Advisor, Materials Science Division, Argonne National Laboratory, Argonne, IL

    Nichols, FA
    Nuclear Engineer and Senior Technical Advisor, Materials Science Division, Argonne National Laboratory, Argonne, IL


    Paper ID: STP34399S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP34399S


    CrossRef ASTM International is a member of CrossRef.