Abstract
The Bauschinger effect has been studied in niobium single crystals cyclically deformed to saturation at small strain amplitudes and at different temperatures. The parameters used to characterize the Bauschinger effect have been measured from the saturation hysteresis loops. The fatigued work-hardened crystals have been modelled as a composite consisting of a hard deformable phase (the regions of high dislocation density) embedded in a soft matrix (the regions of low dislocation density). The values of the mean internal stress in the matrix predicted by this simple composite model are in good agreement with those measured experimentally, using a modification of the method originally proposed by Cottrell to separate the lattice friction and internal stress components in reverse deformation.
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