�ber die plastische Dehnung von ?-Eisenkristallen

Anomalous Slip - A Feature of High-Purity Body-Centred Cubic Metals

“…[7,8]). However, not much later Gough [9], Fahrenhorst and Schmid [10], and Sauerwald and Sossinka [11] demonstrated by different techniques that the Taylor-Elam hypothesis deduced from these observations was in conflict with the experimental observations.…”

“…It appears worthwhile to pursue these questions further by more detailed calculations and by high-resolution transmission electron microscopy. 10 ) The data have been taken from Landolt-Bö rnstein [62,63]. When there was significant disagreement between different measurements, the data that appeared most reliable were chosen.…”

“…For contour plots of Schmid factors of non-primary slip systems, the reader is referred to the literature, e.g. [10,70,71].…”

“…From a careful examination of the slip lines on an a-Fe single crystal deformed in torsion at room temperature, Gough [9] concluded that slip was, in general, of duplex type, involving f110g, f112g, and/or f123g slip planes, the average slope of the slip lines corresponding to the trace of the mrss plane on the specimen surface. He also reported, presumably for the first time, the wavyness of the slip lines at large deformations, a phenomenon that was later observed in many investigations and that found its explanation in the easy cross slip of screw dislocations in bcc metals 3 Þ. Fahrenhost and Schmid [10] made the important observation that during the room-temperature tensile deformation of a-Fe monocrystals of widely different crystallographic orientations, the specimen axes did not always rotate towards the slip direction [111] as expected if inside the entire standard triangle the slip plane was the primary plane ð 1 101Þ. This indicated clearly that f110g planes could not have been the only slip planes and that banal, f112g, or f123g slip had operated if A was located in the left-hand part of the standard triangle.…”

Slip Geometry and Plastic Anisotropy of Body-Centered Cubic Metals

“…Asymmetry between tension and compression in the same crystal. The phenomena were originally detected in the 1920s and 1930s on rather impure bcc materials [1][2][3][4]. Recent work on high-purity a-iron [5,6], ultra-high purity molybdenum [7,8] and high-purity potassium [9][10][11], however, has clearly demonstrated that plastic anisotropy is essentially an intrinsic property of bcc metals, though impurities may have a significant influence on the details.…”