Comments on the Measurement of Dislocation Mobility and the Drag Due to Phonons and Electrons

摘要

Experimental methods for the measurement of intrinsic interactionsudbetween moving dislocations and the crystal lattice are considered. It is emphasized that the stress pulse method is applicableudat stress levels greater than about twice the static flow stress, whileudinternal friction experiments may be used to explore the interaction atudvery low stress levels and small dislocation velocities. Recent resultsudof low temperature stress pulse measurements in Cu are presented.udThe interactions deduced from measurements between 4.2°K and 400°Kudin some FCC metals are compared to theoretical predictions. Suggestions are made for future theoretical and experimental work on unresolvedudaspects of the intrinsic interactions.