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

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2011

Author dc:creator

• Johnson, Eric Carl

Contributors dc:contributor

• Granato, A.V.

• ultrasonic attenuation
• intersitial complexes
• electron irradiated
• Aluminum Alloys

Statement dc:rights

• 1987 Eric Carl Johnson

Language dc:language

en

Identifier

1411768

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/25215