Evolution of defect structures during cold rolling of ultrafine-grained Cu and Cu-Zh alloys: influence of stacking fault energy
Evolution of defect structures during cold rolling of ultrafine-grained Cu and Cu-Zh alloys: influence of stacking fault energy
Samples of pure Cu, bronze (Cu–10 wt.% Zn) and brass (Cu–30 wt.% Zn) with stacking fault energies (SFE) of 78, 35, and 14 mJ/m2, respectively, were processed by high-pressure torsion (HPT) and by a combination of HPT followed by cold-rolling (CR). X-ray diffraction measurements indicate that a decrease in SFE leads both to a decrease in crystallite size and to increases in microstrain, dislocation and twin densities for the HPT and HPT + CR processed ultrafine-grained (UFG) samples. Compared with processing by HPT, subsequent processing by CR refines the crystallite size of all samples, increases the twin densities of UFG bronze and brass, and increases the dislocation density in UFG bronze. It also decreases the dislocation density in UFG brass and leads to an unchanged dislocation density in UFG copper. The results suggest there may be an optimum stacking fault energy for dislocation accumulation in UFG Cu–Zn alloys and this has important implications in the production of materials having reasonable strain hardening and good tensile ductility.
copper, copper–zinc alloys, high-pressure torsion, severe plastic deformation, stacking fault energy, ultrafine-grained materials
342-347
Zhao, Y.H.
4fea315b-8c7d-4bb1-badc-236b309ef228
Horita, Z.
84a80017-cbaf-4713-8346-6f69ac7ea63e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Zhu, Y.T.
ddbd5b30-13ca-45a6-9296-ed5b60811efb
15 February 2008
Zhao, Y.H.
4fea315b-8c7d-4bb1-badc-236b309ef228
Horita, Z.
84a80017-cbaf-4713-8346-6f69ac7ea63e
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Zhu, Y.T.
ddbd5b30-13ca-45a6-9296-ed5b60811efb
Zhao, Y.H., Horita, Z., Langdon, T.G. and Zhu, Y.T.
(2008)
Evolution of defect structures during cold rolling of ultrafine-grained Cu and Cu-Zh alloys: influence of stacking fault energy.
Materials Science and Engineering: A, 474 (1-2), .
(doi:10.1016/j.msea.2007.06.014).
Abstract
Samples of pure Cu, bronze (Cu–10 wt.% Zn) and brass (Cu–30 wt.% Zn) with stacking fault energies (SFE) of 78, 35, and 14 mJ/m2, respectively, were processed by high-pressure torsion (HPT) and by a combination of HPT followed by cold-rolling (CR). X-ray diffraction measurements indicate that a decrease in SFE leads both to a decrease in crystallite size and to increases in microstrain, dislocation and twin densities for the HPT and HPT + CR processed ultrafine-grained (UFG) samples. Compared with processing by HPT, subsequent processing by CR refines the crystallite size of all samples, increases the twin densities of UFG bronze and brass, and increases the dislocation density in UFG bronze. It also decreases the dislocation density in UFG brass and leads to an unchanged dislocation density in UFG copper. The results suggest there may be an optimum stacking fault energy for dislocation accumulation in UFG Cu–Zn alloys and this has important implications in the production of materials having reasonable strain hardening and good tensile ductility.
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Submitted date: October 2006
Accepted/In Press date: October 2006
Published date: 15 February 2008
Keywords:
copper, copper–zinc alloys, high-pressure torsion, severe plastic deformation, stacking fault energy, ultrafine-grained materials
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 48982
URI: http://eprints.soton.ac.uk/id/eprint/48982
ISSN: 0921-5093
PURE UUID: 8d849334-27df-4c1d-8913-4a074af8f346
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Date deposited: 26 Oct 2007
Last modified: 16 Mar 2024 03:28
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Author:
Y.H. Zhao
Author:
Z. Horita
Author:
Y.T. Zhu
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