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Origin and Spacing of Slip Bands

Abstract

SLIP bands on plastically deformed crystals are very much more equidistant than would correspond to statistical disorder; except in the first stage of deformation, their spacing fluctuates around a mean value which is usually between 0.5 μ and 10 μ. This remarkable phenomenon seems to have a simple explanation. Consider a crystal lattice subjected to a shear stress σ which produces the elastic strain s = tan α = σ /G (G is modulus of shear). Suppose that slip takes place in the slip plane p-p (see accompanying diagram) over an area the linear dimensions of which are great compared with the atomic distance, but small compared with the size of the crystal. The slipped area is surrounded by a dislocation zone D,D, and the stress in its immediate neighbourhood has fallen to a small amount which we assume to be zero. The question is, how far the zone of greatly diminished stress stretches on the two sides of the slip plane.

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OROWAN, E. Origin and Spacing of Slip Bands. Nature 147, 452–453 (1941). https://doi.org/10.1038/147452a0

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