Dynamic Young’s modulus and internal friction in polycrystalline copper

An attempt has been made to measure the temperature dependence of dynamic Young's modulus together with the related variation of internal friction in polycrystalline copper. A mechanical spectroscopy study was employed using a standard servo hydraulic fatigue testing machine equipped with a sca...

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Bibliographic Details
Published in:Metals and materials international 2003-10, Vol.9 (5), p.439-445
Main Authors: Kang, Chang-Seog, Chang, Si-Young, Hong, Sung-Kil
Format: Article
Language:English
Subjects:
ACTIVATION ENERGY
Copper
CRYSTAL STRUCTURE
Dynamic modulus of elasticity
Dynamics
ELASTICITY
Extensometers
Fatigue testing machines
Fatigue tests
Friction
Grain boundary sliding
Hydraulics
Internal friction
MODULUS OF ELASTICITY
Polycrystals
Quantitative analysis
Relaxation time
Storage modulus
Temperature dependence
Very Low Frequencies
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Summary:An attempt has been made to measure the temperature dependence of dynamic Young's modulus together with the related variation of internal friction in polycrystalline copper. A mechanical spectroscopy study was employed using a standard servo hydraulic fatigue testing machine equipped with a scanning laser extensometer. Dynamic Young's modulus and internal friction were measured over a temperature range of 298 to 873 K at very low frequencies of 0.1, 0.05, and 0.01 Hz. One internal friction peak was observed over the ranges 450 to 700 K, together with marked decreases in the dynamic Young's modulus in the same temperature range. From a quantitative analysis of the experimental data with the relaxation strength, relaxation time, and activation energy, it is concluded that the peak phenomenon is due to grain-boundary sliding relaxation.
ISSN:1598-9623
2005-4149
DOI:10.1007/BF03027148