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Title:An ultrasonic study of impurity-interstitial complexes in electron irradiated Al-Si and Al-Ag
Author(s):Johnson, Eric Carl
Doctoral Committee Chair(s):Granato, A.V.
Department / Program:Physics
Discipline:Physics
Degree:Ph.D.
Genre:Dissertation
Subject(s):ultrasonic attenuation
intersitial complexes
electron irradiated
Aluminum Alloys
Abstract:Ultrasonic attenuation and velocity measurements were performed to probe the structure and annealing behavior of solute self interstitial complexes in electron irradiated (T < 70 K) dilute Al-Ag and Al-Si alloys. In both alloy systems, a similar attenuation peak structure is observed. This peak structure strongly suggests that in both alloys, a defect species of <110>- monoclinic defect symmetry is present. The annealing, during Stage II, of this defect species follows a first order rate -equation which has a prefactor proportional to the solute concentration. The diaelastic effect associated with this defect is found to be comparable in magnitude and anisotropy to that attributed to <100>-self interstitial dumbbells in pure aluminum. A <110>-monoclinic mixed dumbbell model is examined as a possible explanation for these results.
Issue Date:1987
Genre:Dissertation / Thesis
Type:Text
Language:English
URI:http://hdl.handle.net/2142/25215
Rights Information:1987 Eric Carl Johnson
Date Available in IDEALS:2011-06-02
Identifier in Online Catalog:1411768


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