Comments on the paper Does the subgrain size influence the rate of creep?
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A recent paper questions the validity of the experimental observations and the conclusions reached by other researchers on the importance of cells in determining the creep behavior of materials. In an attempt to duplicate the stress change experiment described by the latter researchers, which resulted in a cellular microstructure, it was reported that cells were not observed in the test described in that recent paper. As a result, it was suggested that the microstructural observations reported by the latter researchers were an artifact since they may have been made too close to the compression surface. The present letter clarifies our experimental procedures and observations on NaCl single crystals in the light of the points raised by the authors of the recent paper and examines the importance of cells in determining creep behavior. It is concluded that cells are not spurious microstructural features and that they should be included along with subgrains and "free" dislocations in developing creep models. 1991.