Abstract
Abstract In copper, a dislocation glide on non-compact slip planes {100}, {110}, and also {11X}, X = 2, 3, … can locally appear in the deformation process at high temperatures. The present work gives a summary of recent investigations of microstructures formed at temperatures of 773–973 K in the case of compressive and tensile creep and in single shear deformation realized on double-notch specimens, first of all the detection of traces of this process in the slip pattern and dislocation structure. A discussion leads to the conclusion that favorable conditions for the non-compact glide are given by a double (multiple) slip on symmetrically oriented {111} slip systems, operating on different planes, and a stress concentration. The last condition can be justified, e. g., by the inhomogeneous bi-axial stress field.
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