Paper Title:
Mechanical Spectroscopy of Ultrafine Grained Copper
  Abstract

Temperature and amplitude dependent internal friction (TDIF and ADIF) in ultrafine-grained copper (99.95% Cu) processed by 1, 4, or 8 passes of equal channel angular pressing (route BC) and then subjected to annealing was investigated by means of mechanical spectroscopy. A dynamical mechanical analyzer DMA Q800 was used. The tests covered the temperature range from -100 to 550 °C, the strain amplitude range from 10-6 to 10-3, and the frequency range from 0.05 to 100 Hz. Two internal friction peaks were observed. They were explained by structural relaxation due to the recrystallisation process and by thermally activated grain boundary relaxation with a broad distribution of relaxation times. Increased amplitude dependent damping in ultrafine-grained copper is believed to be associated with a dislocation mechanism, rather than a grain boundary mechanism.

  Info
Periodical
Materials Science Forum (Volumes 667-669)
Edited by
Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon
Pages
857-862
DOI
10.4028/www.scientific.net/MSF.667-669.857
Citation
I. S. Golovin, Y. Estrin, "Mechanical Spectroscopy of Ultrafine Grained Copper", Materials Science Forum, Vols. 667-669, pp. 857-862, 2011
Online since
December 2010
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Price
$32.00
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