Microstructural Evolution in a Cu-Zr Alloy Processed by a Combination of ECAP and HPT
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.
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 http://dx.doi.org/10.1016/j.msea.2013.05.010
Materials Science and Engineering
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