Damage rate and recovery measurements in dilute AlCo alloys

The interaction of migrating Al self-interstitials with Co atoms has been investigated in the same dilute AlCo alloys which were used previously for Moessbauer spectroscopy experiments. Resistivity damage rate and recovery experiments were performed in the temperature range 50 to 150 K. The effective capture radius of Co for migrating Al self-interstitials was found to be so large that correction terms had to be applied in the analysis of the damage rate data. The capture radius decreases slightly with increasing irradiation temperature. The resistivity contribution of a Co-Al interstitial complex was found to be considerably less than the sum of the resistivity contributions of an isolated solute Co atom and an Al self-interstitial. The results are explained by a model, which assumes that Al self-interstitials are trapped both at deep and shallow traps, and are compared with Moessbauer data of the same alloys. (author)