Paper Title:
In Situ Annealing of Severe Plastic Deformed OFHC Copper
  Abstract

A pure OFHC copper is subjected to severe plastic deformation (SPD) by a well defined high pressure torsion process at ambient temperature. The change in microstructure of samples deformed to different strains, up to ε=64, is investigated in-situ, during annealing at 170°C, within a scanning electron microscope. The spatial distribution of nucleation sites changes significantly with increasing strain from nucleation at triple junctions and grain boundaries to a random distribution of sites for von Mises equivalent strains beyond ε=4. The resulting mean size of recrystallized grains is about 6.75 times larger than the mean microstructural size of the corresponding as-deformed state. For strains larger than ε=16 the recrystallized microstructure appears to be independent of preceding strain. A detailed investigation of the nucleation of recrystallized grains following very large strains shows that certain microstructural elements are favoured as nuclei and were particularly taken into account.

  Info
Periodical
Materials Science Forum (Volumes 558-559)
Edited by
S.-J.L. Kang, M.Y. Huh, N.M. Hwang, H. Homma, K. Ushioda and Y. Ikuhara
Pages
1345-1351
DOI
10.4028/www.scientific.net/MSF.558-559.1345
Citation
S. Scheriau, A. Vorhauer, R. Pippan, "In Situ Annealing of Severe Plastic Deformed OFHC Copper", Materials Science Forum, Vols. 558-559, pp. 1345-1351, 2007
Online since
October 2007
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Price
$32.00
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