STP1046

    The Leading Factor Transient Regime of Void Swelling: The Role of Bias Vacancy Flow Around Growing Precipitates

    Published: Jan 1990


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    Abstract

    A model of additional bias flow of vacancies is proposed based on the chemical interaction between point defects and solutes to understand the swelling data observed in complex alloys such as austenitic stainless steels, where the large swelling rate of steady state occurred after the completion of a transient regime. The larger cavities accompanied with larger precipitate particles were observed in the steady state regime. Such observations can be explained as follows: the growing precipitates give rise to the bias vacancy flow due to the chemical potential gradient around the precipitates, that is, the faster diffusion of solutes to the precipitate could bring about vacancy flow to inverse direction based on Kirkendall effect. The inhomogeneous flow of solutes could form the vacancy created and destroyed zones around the precipitates dynamically. This bias flow could cause an enhancing of the growth rate of cavities located near the precipitates, which results in the large swelling rate in the steady state regime.

    Keywords:

    chemical bias effect, void swelling, phase stability, steady state swelling, transient regime, stainless steel, cavity-precipitate association, neutron irradiation


    Author Information:

    Hishinuma, A
    Japan Atomic Energy Research Institute, Tokaimura, Ibaraki-ken,

    Kiuchi, K
    Japan Atomic Energy Research Institute, Tokaimura, Ibaraki-ken,


    Paper ID: STP24664S

    Committee/Subcommittee: E10.03

    DOI: 10.1520/STP24664S


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