From individual dislocation motion to collective behaviour

摘要

The dynamical behaviour of dislocations under load is analysed in terms of a balance between mutual interactions and lattice friction, defining a screening distance which is compared to dislocation separation. Large friction stresses or low dislocation densities obviously result in individual dislocation motion; a few examples taken from TEM in situ experiments illustrate how mechanisms recorded at the dislocation scale may help in understanding the macroscopic mechanical behaviour of such materials.