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Characteristics of grain refinement in oxygen-free copper processed by equal-channel angular pressing and dynamic testing.

Alawadhi, M.Y., Sabbaghianrad, S., Wang, Y.C., Huang, Y. and Langdon, T.G., 2020. Characteristics of grain refinement in oxygen-free copper processed by equal-channel angular pressing and dynamic testing. Materials Science and Engineering: A, 775 (February), 138985.

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DOI: 10.1016/j.msea.2020.138985

Abstract

Oxygen-free copper was processed by equal-channel angular pressing (ECAP) at room temperature for 1, 4 and 8 passes and then the ECAP specimens were further deformed by dynamic testing at 298 K using a strain rate of 10 s-1. Experiments were conducted to investigate the influence of the initial microstructures induced by ECAP on the subsequent grain refinement and mechanical properties after dynamic testing. The results show the strength of copper increased with increasing numbers of ECAP passes and a significant additional grain refinement was produced in the ECAP specimens through the dynamic testing. Thus, the initial grain sizes after ECAP for 1, 4 and 8 passes were ~16, ~4.4 and ~2.9 µm, respectively, and these values were reduced to ~400, ~330 and ~300 nm by dynamic testing, The grains were refined by conventional dislocation processes in the 1-pass specimen but there was evidence for dynamic recrystallization in the specimen processed by 8 passes.

Item Type:Article
ISSN:0921-5093
Uncontrolled Keywords:copper; dynamic testing; equal-channel angular pressing; high strain rates; severe plastic deformation
Group:Faculty of Science & Technology
ID Code:33262
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:20 Jan 2020 11:24
Last Modified:04 Feb 2020 09:42

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