Accession Number : AD0437658


Title :   QUENCHING AND ANNEALING OF ZONE REFINED ALUMINUM,


Corporate Author : ILLINOIS UNIV URBANA


Personal Author(s) : Doyama,M. ; Koehler,J. S.


Report Date : SEP 1963


Pagination or Media Count : 46


Abstract : During the last several years an appreciable amount of information concerning point defects has been obtained both from equilibrium and nonequilibrium measurements. When metals are quenched from a high temperature to a low temperature most of the imperfections present in thermal equilibrium at the high temperature can be frozen in. In close-packed metals the dominant imperfections are vacancies, vacancy clusters, and dislocations arising from collapsed vacancy clusters. This research is aimed at determining the activation energy for motion of a divacancy and the binding energy of a divacancy as well as investigating the binding energy of larger clusters in aluminum. The activation energy for motion of a divacancy in aluminum was interpreted to be 0.50 = 0.04 eV. The binding energy of a divacancy in aluminum was interpreted to be 0.17 = 0.05 eV. (Author)


Descriptors :   (*ALUMINUM, HEAT TREATMENT), PURIFICATION, ZONE MELTING, QUENCHING, HEAT OF ACTIVATION, DYNAMICS, CRYSTAL DEFECTS


Distribution Statement : APPROVED FOR PUBLIC RELEASE