Abstract
In this paper a new approach to the study of moving dislocations in alloys during plastic deformation will be presented. Since the process of dislocation motion consists of atomic movements nuclear magnetic resonance techniques offer a possibility to determine the manner in which dislocations progress through the solid as a function of time. The spin-lattice relaxation rate in the rotating frame, T1ρ–1 of 27Al has been measured as a function of the plastic strain rate є at 77 K. From the motion induced part of the relaxation rate the mean jump distance of a mobile dislocation is calculated which is determined by the density of lattice defects acting as obstacles for moving dislocations. Correlations between the “in situ” observed mean free path of mobile dislocations and between the microscopic defect structure arising from the ageing process in Al-Cu alloys (θ′ plates, solid solution) and the degree of plastic deformation e are shown.
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