Internal friction peak associated with the enhanced re-orientation of split interstitials of magnesium atoms in close vicinity of the dislocation kinks in aluminium

T. S. Kê(Ge Tingsui); Q. Tan

doi:10.1016/0956-7151(91)90288-C

Internal friction peak associated with the enhanced re-orientation of split interstitials of magnesium atoms in close vicinity of the dislocation kinks in aluminium

T. S. Kê(Ge Tingsui)^*, Q. Tan

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

A new internal friction peak has been observed around 125°C (| = 1 Hz) in AlMg specimens twisted and subsequently annealed at an elevated temperature. This peak appears only when internal friction measurements are taken at descending temperatures. It does not appear in the case of tensile deformation and the peak is suppressed by subsequent tensile deformation. The activation energy is found to be 0.7 ± 0.1 eV and τ₀ is 10^-8 s. The peak is very sensitive to application of a small bias-stress. It is assumed that the mechanism of this peak is the stress-induced re-orientation of an <100 > split interstitials or dumbbell of MgMg atoms enhanced by the stress field of moving dislocation kinks in aluminium.

Original language	English
Pages (from-to)	885-891
Number of pages	7
Journal	Acta Metallurgica et Materialia
Volume	39
Issue number	5
DOIs	https://doi.org/10.1016/0956-7151(91)90288-C
State	Published - May 1991
Externally published	Yes

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title = "Internal friction peak associated with the enhanced re-orientation of split interstitials of magnesium atoms in close vicinity of the dislocation kinks in aluminium",

abstract = "A new internal friction peak has been observed around 125°C (| = 1 Hz) in AlMg specimens twisted and subsequently annealed at an elevated temperature. This peak appears only when internal friction measurements are taken at descending temperatures. It does not appear in the case of tensile deformation and the peak is suppressed by subsequent tensile deformation. The activation energy is found to be 0.7 ± 0.1 eV and τ0 is 10-8 s. The peak is very sensitive to application of a small bias-stress. It is assumed that the mechanism of this peak is the stress-induced re-orientation of an <100 > split interstitials or dumbbell of MgMg atoms enhanced by the stress field of moving dislocation kinks in aluminium.",

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year = "1991",

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T1 - Internal friction peak associated with the enhanced re-orientation of split interstitials of magnesium atoms in close vicinity of the dislocation kinks in aluminium

AU - Kê(Ge Tingsui), T. S.

AU - Tan, Q.

PY - 1991/5

Y1 - 1991/5

N2 - A new internal friction peak has been observed around 125°C (| = 1 Hz) in AlMg specimens twisted and subsequently annealed at an elevated temperature. This peak appears only when internal friction measurements are taken at descending temperatures. It does not appear in the case of tensile deformation and the peak is suppressed by subsequent tensile deformation. The activation energy is found to be 0.7 ± 0.1 eV and τ0 is 10-8 s. The peak is very sensitive to application of a small bias-stress. It is assumed that the mechanism of this peak is the stress-induced re-orientation of an <100 > split interstitials or dumbbell of MgMg atoms enhanced by the stress field of moving dislocation kinks in aluminium.

AB - A new internal friction peak has been observed around 125°C (| = 1 Hz) in AlMg specimens twisted and subsequently annealed at an elevated temperature. This peak appears only when internal friction measurements are taken at descending temperatures. It does not appear in the case of tensile deformation and the peak is suppressed by subsequent tensile deformation. The activation energy is found to be 0.7 ± 0.1 eV and τ0 is 10-8 s. The peak is very sensitive to application of a small bias-stress. It is assumed that the mechanism of this peak is the stress-induced re-orientation of an <100 > split interstitials or dumbbell of MgMg atoms enhanced by the stress field of moving dislocation kinks in aluminium.

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DO - 10.1016/0956-7151(91)90288-C

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SN - 0956-7151

VL - 39

SP - 885

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JO - Acta Metallurgica et Materialia

JF - Acta Metallurgica et Materialia

IS - 5

ER -

Internal friction peak associated with the enhanced re-orientation of split interstitials of magnesium atoms in close vicinity of the dislocation kinks in aluminium

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