Dynamic young's modulus and internal friction in particulate SiC/Al composites

Anelastic behavior of an SiC particulate reinforced aluminum composite has been examined through the measurements of the dynamic Young's modulus and internal friction over a temperature range from 25-450 deg C at frequencies of 0.01, 0.05 and 0.1 Hz. A standard servo-hydraulic mechanical testin...

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Published in:Acta materialia 1998-02, Vol.46 (4), p.1209-1220
Main Authors: KANG, C.-S, MAEDA, K, WANG, K.-J, WAKASHIMA, K
Format: Article
Language:English
Subjects:
Anelasticity, internal friction, stress relaxation, and mechanical resonances
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Mechanical and acoustical properties of condensed matter
Metals. Metallurgy
Physics
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MAEDA, K
WANG, K.-J
WAKASHIMA, K
description Anelastic behavior of an SiC particulate reinforced aluminum composite has been examined through the measurements of the dynamic Young's modulus and internal friction over a temperature range from 25-450 deg C at frequencies of 0.01, 0.05 and 0.1 Hz. A standard servo-hydraulic mechanical testing machine equipped with an infrared lamp heater was employed, but the dynamic measurement system therein was especially designed by assembling a scanning laser extensometer and a frequency response analyzer for detecting the amplitude and phase lag of strain in response to a sinusoidal time-varying stress. Two broad peaks of internal friction were observed over the ranges 100-350 deg C (LT peak) and 250-400 deg C (HT peak), together with marked decreases in the dynamic Young's modulus in the same temperature ranges. From a quantitative analysis of the experimental data, it is concluded that the HT peak phenomenon is due to grain-boundary relaxation, whereas the LT peak phenomenon is ascribable to the relaxation caused by stress-directed interfacial diffusion of Al atoms along the particle-matrix interface.
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subjects Anelasticity, internal friction, stress relaxation, and mechanical resonances
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Mechanical and acoustical properties of condensed matter
Metals. Metallurgy
Physics
title Dynamic young's modulus and internal friction in particulate SiC/Al composites
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