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Abstract
Strain-ageing experiments on single crystals of NaCl doped with small amounts of CdCl2 show that such crystals behave in a manner similar to impure metals. A yield point can be induced by ageing at temperatures around 100°c. The characteristics of the yield point can be explained most satisfactorily by Cottrell's theory of strain ageing, assuming impurity-positive ion-vacancy pairs to segregate in the dislocation cores. The effect is not associated with charged dislocations.