High‐voltage electron microscope high‐temperature in situ straining experiments to study dislocation dynamics in intermetallics and quasicrystals

Abstract

SummaryThe dynamic behaviour of dislocations in several intermetallic alloys, studied by in situ straining experiments in a highvoltage electron microscope, is compared at room temperature and at high temperatures. In contrast to room temperature, the dislocations move viscously at high temperatures, which is explained by diffusion processes in the dislocation cores. In quasicrystals, the viscous dislocation motion can be interpreted by models on the cluster scale.