University of Illinois Urbana-Champaign

An ultrasonic study of impurity-interstitial complexes in electron irradiated Al-Si and Al-Ag

Johnson, Eric Carl

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https://hdl.handle.net/2142/25215

Description

Title
An ultrasonic study of impurity-interstitial complexes in electron irradiated Al-Si and Al-Ag
Author(s)
Johnson, Eric Carl
Issue Date
1987
Doctoral Committee Chair(s)
Granato, A.V.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • ultrasonic attenuation
  • intersitial complexes
  • electron irradiated
  • Aluminum Alloys
Language
en
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.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/25215
Copyright and License Information
1987 Eric Carl Johnson

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Graduate Theses and Dissertations at Illinois