Kink pair formation on screw dislocations was investigated by performing anelastic creep measurements at temperatures near to ambient. The effect of the applied stress upon the activation energy and pre-exponential factor for kink pair formation was investigated for applied stresses below 16MPa. An extrapolation of the observed stress dependence indicated values of 0.49eV and 7.16 x 1012/s for the enthalpy and pre-exponential factor, respectively, of an isolated single kink. Both the enthalpy and the pre-exponential factor decreased markedly with increasing stress. These features were very similar to those which had been reported for Nb and Fe after anelastic creep measurements. It was suggested that a change in the core structure played an important role in the rate of kink pair formation on screw dislocations in body-centered cubic metals.

H.Mizubayashi, H.Egashira, S.Okuda: Acta Metallurgica et Materialia, 1995, 43[1], 269-76