RESISTOMETRIC INVESTIGATION OF THE RECOVERY OF DILUTED A1-MG ALLOYS COLD-WORKED AT LIQUID NITROGEN TEMPERATURE.
Abstract
A set of diluted A1-Mg alloys, with a Mg content varying from 0 (99.995%A1) 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 30, 1964
- Accession Number
- AD0601654
Entities
People
- S. Ceresara
- T. Federighi