Pre-macro yielding and the orientation dependence of the “shear” stress in molybdenum single crystals

Abstract

The orientation dependence of the “shear” stress of molybdenum single crystals is reviewed in terms of activation volumes and dislocation structures. It is concluded that the definition of the shear stress is of importance for the observation of an orientation effect: if a macroyield point beyond which the activation volume remains strain‐independent is chosen as the shear stress, no orientation dependence can be resolved within the limits of scatter of the method.