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)

doi:10.1016/0956-7151(91)90287-B

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 journal › Article › peer-review

8 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 language	English
Pages (from-to)	877-884
Number of pages	8
Journal	Acta Metallurgica et Materialia
Volume	39
Issue number	5
DOIs	https://doi.org/10.1016/0956-7151(91)90287-B
State	Published - May 1991
Externally published	Yes

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

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.",

author = "Q. Tan and {K{\^e}(Ge Tingsui)}, {T. S.}",

year = "1991",

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doi = "10.1016/0956-7151(91)90287-B",

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T1 - Internal friction peak (P3 peak) attributed to the interaction of cottrell atmosphere of magnesium atoms with dislocation kinks in aluminium

AU - Tan, Q.

AU - Kê(Ge Tingsui), T. S.

PY - 1991/5

Y1 - 1991/5

N2 - 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.

AB - 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.

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JF - Acta Metallurgica et Materialia

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

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