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

The dynamic behaviour of dislocations in several intermetallic alloys, stud ied by in situ straining experiments in a high-voltage electron microscope, is compared at room temperature and at high temperatures. In contrast to r oom temperature, the dislocations move viscously at high temperatures. whic h is explained by diffusion processes in the dislocation cores. In quasicry stals, the viscous dislocation motion can be interpreted by models on the c luster scale.