Internal Friction study of solute segregation to dislocations

Journal Article · Sat Jan 01 04:00:00 EST 1983 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(83)90107-4· OSTI ID:6973943

Schwarz, R B; Funk, L L

Internal Friction (IF) techniques operating at a frequency of 1.3kHz were used to measure the solution hardening component of the flow stress as a function of temperature, static aging time, and solute concentration in single crystal alloys of Al-Mg and Cu-Al. During the IF tests most of the dislocations remained in their aged condition. A small fraction of the dislocation density was set free from their solute cloud by the application of a sufficiently large periodic stress. The kinetics of solute segregation to the freed dislocations was then monitored with the IF method. The experimental results were interpreted in terms of recent computer-modeling calculations for IF losses in random alloys. The kinetics of solute segregation shows three regimes. At low temperatures the dislocations interact with a fixed population of solutes. At intermediate temperatures solutes segregate to stationary dislocations mostly from the region surrounding the dislocation cores, without the assistance of an excess concentration of vacancies generated by plastic deformation. At high temperatures the segregation reaches a saturation value because the solutes tend to remain in solution, rather than segregate to dislocations.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 6973943
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 31:2; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
FRICTION
INTERNAL FRICTION
KINETICS
MAGNESIUM ALLOYS
STRESSES
TEMPERATURE DEPENDENCE