RESISTOMETRIC INVESTIGATION OF THE RECOVERY OF DILUTED A1-MG ALLOYS COLD-WORKED AT LIQUID NITROGEN TEMPERATURE.
Final rept. 1 Jan-31 Dec 63.
ISTITUTO SPERIMENTALE DEI METALLI LEGGERI MILAN (ITALY)
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A set of diluted A1-Mg alloys, with a Mg content varying from 0 99.995A1 to 1.48 at. , has been cold-worked by compression at liquid-nitrogen temperature, and the recovery of the electrical resistivity has been investigated in the temperature range from -190C to 340C. Four principal recovery stages, conventionally indicated as H-1, H-2, H-3 and H-4, can be envisaged, during the isochronal annealing, in pure Al as well as in the alloys. Stages H-2 and H-3, which appeared as the most important recovery stages, have been investigated in more detail by the isothermal annealing method. A tentative interpretation of the results has been advanced, assuming that the four recovery stages observed in alloys corresponds substantially to the same observed in pure Al. In this way stage H-1 can be identified with the release of interstitial-type defects from their traps stage H-2 can be identified with the migration of vacancies to dislocations stages H-3 and H-4 can be identified with the removal of dislocations by the polygonization and recristallization processes, respectively.