Internal friction peak (P3 peak) attributed to the interaction of cottrell atmosphere of magnesium atoms with dislocation kinks in aluminium

Q. Tan*, T. S. Kê(Ge Tingsui)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

An internal friction peak vs temperature has been observed around 260°C (| = 1 Hz) in cold-twisted and partially annealed AlMg solid solutions. Internal friction peak vs strain amplitude appears around the temperature region of this peak. Systematic studies have been made on the effect of deformation, annealing, bias-stress, Mg content and ageing treatments. The activation energy associated with this peak was found to be close to that of the bulk diffusion of Mg atoms in aluminium. A dislocation-kink Cottrell atmosphere model is suggested according to which this new peak (P3 peak) is attributed to the stress-enhanced long-ranged diffusion of the Mg solute atoms constituting the Cottrell atmosphere around the dislocation kink chain introduced in the specimen by twisting deformation.

Original languageEnglish
Pages (from-to)877-884
Number of pages8
JournalActa Metallurgica et Materialia
Volume39
Issue number5
DOIs
StatePublished - May 1991
Externally publishedYes

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