Abstract
Two previously proposed quantitative models for the radiation-induced dimensional changes in polycrystalline graphite treated the material as containing a single crystalline phase. One model was based on thermodynamic relationships and the other was derived by averaging the contributions of the individual crystallites. A third model emphasized the effects of small quantities of a second, less crystalline phase, but this model has not been expressed analytically. In the present work, measurements of dimensional changes in radial, circumferential, and longitudinal samples from an extruded graphite tube irradiated to exposures between 1.5 and 2.4 × 10 21 nvt (E>0.18 MeV) at temperatures between 540° and 1060°C were compared with the relationships predicted by the two quantitative models. It was found that the data agreed best with the single-phase thermodynamic model.
Published Version
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