Paper Title:
Internal Friction and Young's Modulus of 9Al2O3 2B2O3 Whisker Reinforced Aluminum Matrix Composite
  Abstract

Anelastic behavior of a 9Al2O3·2B2O3 (AlBw) whisker reinforced aluminum composite has been examined through the measurements of the dynamic Young’s modulus and internal friction over a temperature range of 25 to 500°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 peaks of internal friction were observed over the ranges 100 to 250°C (LT peak) and 250 to 400°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 whisker-matrix interface.

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
997-1003
DOI
10.4028/www.scientific.net/MSF.539-543.997
Citation
C. S. Kang, I. H. Oh, J. I. Cho, J. S. Lee, C. H. Yun, H. T. Son, H.L. Cha, J. C. Bae, "Internal Friction and Young's Modulus of 9Al2O3 2B2O3 Whisker Reinforced Aluminum Matrix Composite", Materials Science Forum, Vols. 539-543, pp. 997-1003, 2007
Online since
March 2007
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$32.00
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