Abstract
1. Molybdenum single crystals subjected to a static tensile load are extremely sensitive to the strain rate and very quickly work harden when this rate is increased. This effect is caused by low mobility of screw dislocations in molybdenum at room temperature with the sources blocked. 2 Work hardening of molybdenum under cyclic load is determined by the loading rate and low mobility of the screw components of strain. 3. The kinetics of the change of inelastic strain under cyclic load is associated with the kinetics of the changing dislocation structure in molybdenum crystals in fatigue: a) a considerable increase in Δe in the early stages of cyclic loading is associated with the multiplication of dislocations in conditions of multiple accumulation and with subsequent regrouping of dislocations; b) the stabilization of Δɛ is caused by simultaneous actuation of two opposing processes: work softening (regrouping of dislocations) and work hardening (screening of slip by the surface layer). 4. The absolute amount of inelastic strain in the cyclic loading process is determined by the number of active slip systems and the intensity of slip at each of the systems in conjunction with the features of multiplication and regrouping of dislocations in the bcc lattice.
Published Version
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