Dislocation glide in non-compact crystal planes

under appropriate conditions, dislocation glide can appear not only in comp act crystal planes which are optimum for its realization, but also in other types of nan-compact (NCI planes. The interest in a more systematical know ledge of this mechanism was increased in connection with its importance in modern metallic and inter-metallic materials, but the phenomenon was also w idely investigated in pure metals. This paper tries to give an overview of a published knowledge on the non-compact dislocation glide mostly in metall ic materials. It starts from model ideas and illustrates their realization by characteristic performances of the non-compact glide in experiments. As mechanisms of the NC glide, the Peierls mechanism and the locking-unlock ing combination can be accepted. In fee metals, the NC glide can appear in several types of crystal planes, the intensity of its participation in stra ining, beside the glide in the compact planes, depends on the stacking faul t energy and is a function of temperature. As thermally activated process, NC glide is characterized by an activation energy which is higher than the activation energy of lattice diffusion. In hcp metals, a pure NC glide can be realized. Deformation stresses of non-basal systems depend on the disloc ation core structure and the stacking fault energy. In intermetallics, the NC glide assists in the motion of superdislocations and dislocations by act ing in a cross slip between a compact and a NC plane. A similar participati on of the NC glide is observed also in superalloys. The deformation stress anomaly at higher temperatures might be connected with a realization of the NC glide.