Abstract
Abstract The theoretical evaluation of the value of the ratio of cell diameter to dislocation spacing for a material undergoing dislocation creep, by a procedure proposed by Gittus, is extended to a consideration of the complete creep equation. It is found that this ratio depends not only on the concentration of jogs and on the visco-elastic contribution to creep, but also on the strain rate. The theoretical predictions are compared with experimental values obtained from creep and stress-relaxation measurements in stress-relieved Zircaloy-4.
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