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Annealing spectrum of cold-worked silver

✍ Scribed by E.A Attia; R Kamel


Publisher
Elsevier Science
Year
1961
Weight
733 KB
Volume
9
Category
Article
ISSN
0001-6160

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✦ Synopsis


Pure silver wires were cold-worked by twisting to different amounts, and the changes in room temperature internal friction, elastic modulus and resistivity were subsequently measured after various heat pulses have been given at different temperatures. The vacancies created by cold-work were found to anneal out in the temperature range 20-50Β°C with a migration energy of 0.7 eV. An observed drop in the activation energy for defect migration in the heavily cold-worked samples was attributed to divacancies which might in this instance form the major diffusing entity. A second annealing stage came into play in the temperature range lOO-200Β°C. The energy released in this stage is attributed to a cross-slip process activated by an energy ranging between 1.1 eV and 0.85 eV depending on the degree of cold-work. Recrystallization started by annealing at temperatures above 200Β°C. Except for low degrees of deformation, the activation energy for recrystallization averaged to about 1.8 eV, indicating that the process is controlled principally by a self-diffusion mechanism. RECUIT DE L'ARGENT APRES DEFORMATION A FROID Les auteurs ont soumis des fils d'argent pur a differents taux de deformation L froid par torsion, et ont ensuite applique it ces fils des traitements thermiques varies a differentes temperatures. Apres ces traitements thermiquas, ils ont mesure la man&e dont variait le module d'Blasticit6, la resistivite et la friction interne a la temperature ambiante. On observe que les lacunes c&es par la deformation plastique disparaissent par recuit dans la gamme de temperatures de 20 a 5O"C, avec une Bnergie de migration de 0,7 eV. Dans les Bchantillons fortement deform&r, on observe une chute de l'energie d'activation de la migration des defauts, chute attribuee a l'existence de bilacunes qui pourraient pour ces Qchantillons, former le defaut diffusant le plus important. Un deuxieme stade du recuit s'observe dens la gamme de temperature de 100 a 200Β°C. L'energie lib&e6 dans ce deuxieme stade est attribuee 8. un processus de deviation dont l'energie d'activation va de 1,l eV it 085 eV suivant le taux de deformation plastique. La recristallisation debute quand la temperature du recuit est superieure Q 200Β°C. Sauf pour les faibles taux de deformation, l'energie d'activation de la recristallisation est d'environ I,8 eV, ce qui indique qu le processus depend princepaliment d'un phenomene d'auto-diffusion. Y *


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