Article ID Journal Published Year Pages File Type
9796102 Materials Science and Engineering: A 2005 7 Pages PDF
Abstract
For single phase metals, both the stress exponent n and activation energy Q of stationary deformation significantly change from low to high deformation temperature. This paper illustrates a recently developed model of dislocation density evolution, which is able to explain that transition. Important model components in this respect are the consideration of dislocation dipoles (represented as distribution of dipole heights) as well as of dislocation annihilation mechanisms of different kinetics: glide-induced dislocation-dislocation reactions and climb of edge dipole constituents. The model exhibits a transition with decreasing temperature from dislocation climb to glide as the decisive annihilation kinetics, which in turn is reflected in the steady-state deformation behavior.
Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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