Dislocation Dynamics Investigated by Means of Nuclear Magnetic Resonance a Complementarynew Technique

Abstract

Pulsed nuclear magnetic resonance proved to be a new complementary technique for the study of moving dislocations in Al-base alloys. Spin-lattice relaxation measurements clearly indicate that fluctuations in the quadrupolar field caused by moving dislocations in Al-base alloys are different compared to those in ultra-pure Al. From the motion induced part of the spin-lattice relaxation rate the mean jump distance of mobile dislocations has been determined as a function of strain. Measurements have been performed on Al-Cu, Al-Li and Al-Zn binary alloys. As a typical illustration of the strength of this technique, this paper reports the results obtained of Al-(1-2 at%) Zn solid solution.

Effects of solute Mg on grain boundary and dislocation dynamics during nanoindentation of Al–Mg thin films

“…For a review reference is made to [32]. Consequently, the mean jump distance can be predicted by Mott-NabarroÕs model of weakly interacting diffuse forces between Mg solutes and dislocations in Al [33].…”