|Author||Ceresara, S. ♦ Federighi, T. ♦ Gelli, D. ♦ Pieragostini, F.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||METALS, CERAMICS, AND OTHER MATERIALS ♦ ACTIVATION ♦ ALUMINUM ♦ DEFECTS ♦ ELECTRIC CONDUCTIVITY ♦ ENERGY ♦ FAST NEUTRONS ♦ IMPURITIES ♦ INTERSTITIALS ♦ IRRADIATION ♦ LATTICES ♦ LOW TEMPERATURE ♦ NEUTRONS ♦ QUANTITY RATIO ♦ RADIATION DOSES ♦ RADIATION EFFECTS ♦ RECOVERY|
|Abstract||Zone-refined Al and 99.995% purity Al samples were irradiated at liquid- nitrogen temperature at fast (>1 Mev) neutron doses of 1.4 x 10/sup 18/ and 2 x 10/sup 17/ n/cm/sup 2/. The recovery of radiation damage, as revealed by electrical resistivity, takes place mainly in two stages, indicated as stage I/ sub n/-2 and I/sub n/-3, centered respectively at --150 and at -60 deg C. Stage I/ sub n/-2, controlled by an activation energy of about 0.3 ev, is sensitive to the impurity content and was ascribed to the release of trapped interstitials. Stage I/sub n/-3, controlled by an activation energy of 0.59 ev, follows complex kinetics that can be considered a generalization of a second-order reaction. Although the interpretation of this stage is not conclusive, evidence supports the idea that a multiple vacancy-type defect (quadri-vacancy) annihilates by recombination with an immobile interstitial aggregate. (auth)|
|Learning Resource Type||Article|
|Publisher Department||Istituto Sperimentale Metalli Leggeri, Novara, Italy|
|Organization||Istituto Sperimentale Metalli Leggeri, Novara, Italy|
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