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It is shown by an analysis similar to that for the spinodal decomposition of a supersaturated solution that an array of dislocations, modelled by parallel screw dislocations, of uniform density, is unstable; the dislocations move to form a structure having a modulated dislocation density. It is suggested that the instability grows ultimately into a dislocation cell structure and that the cell size is given by the dominant wavelength of the density modulation. This wavelength λm is found to be proportional to ρ−1/2 and furthermore the wavelength is given by λm ≈ Kc·ρ−1/2=rc, where Kc is a constant, ρ is the dislocation density and rc is defined as a dislocation-dislocation interaction distance. Data in the literature relating to cell size are shown to support this result. Restrictions on the applicability of the analysis are discussed.

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