Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Plateau Stress, Thermally Activated Dislocation Motion and Solute Atmosphere Dragging in Concentrated KCl–KBr Solid Solution Single Crystals
Masao Sakamoto
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1987 Volume 56 Issue 9 Pages 3201-3212

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Abstract
The friction stress τt to overcome concentrated solute ions by thermal activation process and the dragging stress τd to move with the solute atmosphere formed by diffusion are given for the edge dislocation in model crystals. The total resistance stress τr which is assumed to be τtd increases with increasing the dislocation velocity from zero once has the maximum, and shows the minimum τmin at the velocity vH and again increaes monotonicaly. The plateau stress is given approximately by τmin. The dislocations separate into high-speed dislocations with vH, and the density ρH, and low-speed dislocations with vL and ρL at τmin. The temperature dependences of vH, vL, ρH and ρL are given. In most region of the plateau, ρH<<ρL but ρHvH>>ρLvL. The serration (P–L effect) is mainly induced by the intermittent group motion of the high-speed dislocations.
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