The early stages of flow in molybdenum single crystals

Abstract

The early stages of flow of high purity molybdenum single crystals with central axial orientations have been studied by thermal activation strain rate analysis over the temperature range 80 K to 398 K. The results clearly demonstrate that it is necessary to independently measure the true plastic strain rate when analyzing deformation behavior in the early stages of flow. This is because a significant amount of plastic strain is required before the plastic and total strain rates approach the value dictated by the cross-head speed. Thermal activation analysis indicates that more than one dislocation mechanism operates at strains less than about 3 pct.