Dislocation Mobility and Damping in LiF

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Abstract
Amplitude dependent dislocation damping was measured in LiF. It was found that average dislocation velocities comparable to those present during plastic deformation occur under periodic stresses more than an order of magnitude below the macroscopic yield stress. This implies that the impediments to dislocation motion effective in plastic deformation are localized at widely separated points along the dislocation.