Abstract
Single crystals of Fe2(Dy, Lb) Laves intermetallic compound with C15 structure were deformed in compression at high temperatures. Above 875[ddot]C they were ductile. The thermal activation parameters were measured and dislocation structures in the deformed specimens were examined by transmission electron microscopy. The activation volume was small and the dislocations were parallel to <112> and <110>. It has been concluded that the high-temperature plasticity of Fe2(Dy, Tb) single crystals is controlled by the Peierls mechanism.