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Void Swelling as a Stochastic, Evolutionary Process [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2001.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
PDF-FILE: 7; SIZE: 0.5 MBYTES pages
Additional Creators
Lawrence Livermore National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Past theories of radiation swelling have mostly dealt with the effect of void growth on the steady-state rather than of void nucleation on the incubation of swelling. However, new analysis indicates that incubation and its dependence on dose rate, impurity concentrations. and temperature dramatically influences the cumulative experimental swelling. We present rate theory calculations of this void nucleation and growth that include the time-dependent coupling and evolution of point defect concentrations, void size distribution, and dislocation density. A transient, swelling-free period originates in the exponential sensitivity of nucleation to the temperature and point defect supersaturations and the dependence of the defect concentrations on the dose rate, temperature, and aggregate sink strengths. Specifically. simulations representing cold worked pure metals show delayed swelling that is governed by dislocation evolution towards a reduced. steady-state density. Impurity atoms are expected to affect the incubation period through the initial dislocation density and subsequent rate of evolution. We conclude that appreciable void swelling requires a sufficiently low concentration of network dislocation and dislocation loop sinks, and that incubation is the time required to achieve this state.
Report Numbers
E 1.99:ucrl-jc-143888
ucrl-jc-143888
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Note
Published through SciTech Connect.
05/01/2001.
"ucrl-jc-143888"
4th Pacific Rim International Conference on Advanced Materials and Processing, Honolulu, HI (US), 12/11/2001--12/15/2001.
Wolfer, W G; Surth, M P.
Funding Information
W-7405-ENG-48
View MARC record | catkey: 14399880