Microstructural Evolution in a Cu-Zr Alloy Processed by a Combination of ECAP and HPT
Abstract
A Cu-0.1% Zr alloy was processed by equal-channel angular pressing (ECAP) for up to 8 passes and the samples processed through 4 and 8 passes were then sectioned into disks and further processed by high-pressure torsion (HPT) for 5 turns. Measurements were taken for the microhardness distributions on cross-sectional planes of the ECAP billets and on the HPT disks and the microstructures were examined using transmission electron microscopy and electron back-scatter diffraction. The results demonstrate that a combination of ECAP and HPT leads to additional grain refinement, higher hardness values and a larger fraction of boundaries having high angles of misorientation. The minimum average grain sizes recorded in these experiments were ~280 and ~260. nm at the center and edge of a disk, respectively, after processing through 8 passes of ECAP and 5 turns of HPT. The results contrast with an earlier report using high-purity Cu where a combination of ECAP and HPT gave a mixture of ultrafine and coarse grains due to the occurrence of dynamic recrystallization during the torsional straining.
Recommended Citation
J. Wongsa-Ngam et al., "Microstructural Evolution in a Cu-Zr Alloy Processed by a Combination of ECAP and HPT," Materials Science and Engineering: A, vol. 579, pp. 126 - 135, Elsevier BV, Sep 2013.
The definitive version is available at https://doi.org/10.1016/j.msea.2013.05.010
Department(s)
Materials Science and Engineering
International Standard Serial Number (ISSN)
0921-5093
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2013 Elsevier BV, All rights reserved.
Publication Date
01 Sep 2013