Abstract
The critical resolved shear stress (CRSS) of various alkali halides doped with divalent ions was measured for slip on {110} and {100} planes in compression and shear. The results are explained in terms of the interaction of edge dislocations with dopant-vacancy dipoles. While {110} glide around room temperature has to overcome long-range elastic (Snoek-type) interaction, in general a Fleischer-type interaction with both elastic and electrostatic contributions is responsible for the glide resistance. The so-calculated plastic anisotropy at T = 0 is in qualitative agreement with that extrapolated from experiment. The observed correlation of the plastic anisotropy and solution hardening parameters with the polarizability (Σα) of the ions of the host lattice is explained by the dependence of the electrostatic interaction energy between dislocation and dipole on Σα.
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