MIGRATION OF THE INTERSTITIAL-IMPURITY MIXED DUMBBELL CONFIGURATION IN Al-ZnReport as inadecuate




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Abstract : From measurements of ultrasonic attenuation and velocity in alloys with different atomic Zn concentrations .01%, 0.1%, and 0.5%, we obtain positive evidence that the Al-Zn dumbbell migrates as a unit. From measurements in specimens containing 1000 ppm Zn and 70 ppm of Fe it is found that only 3% of the dumbbells dissociate at the annealing temperature near 140 K for Al -0.1% Zn. In the present measurements it is found that the annealing temperature decreases with increasing zinc concentration. A possible migration mechanism involving looping of the interstitial which leads to long range migration of the dumbbell is developed, and dumbbell migration and interstitial escape energies of Um = 0.36 eV and UE = 0.46 eV are obtained.





Author: P. Wallace K. Hultman J. Holder A. Granato

Source: https://hal.archives-ouvertes.fr/



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