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Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys

Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys
Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys
Experiments were conducted on samples of pure Cu and two Cu–Zn alloys to evaluate the influence of the stacking-fault energy (SFE) on microstructural development when processing using high-pressure torsion (HPT). Transmission electron microscopy, X-ray diffraction and hardness measurements were used for microstructural evaluation and the results show consistency between these techniques. Grain sizes in the nanometer range were formed at the edges of the HPT disks, larger submicrometer grains were formed in the disk centers and the measured grain sizes decreased with decreasing SFE. There was negligible twinning in pure Cu but the densities of dislocations and twins increased with increasing Zn content and thus with decreasing SFE. The values of the Vickers microhardness were lower in the centers of the disks for the two Cu–Zn alloy and this is consistent with the low SFE and slow rates of recovery.
copper alloys, high-pressure torsion, severe plastic deformation, stacking-fault energy, x-ray diffraction
1359-6454
809-820
Balogh, Levente
bc1beb0e-e4dd-4549-9a2d-afda6c91a869
Ungár, Tamás
680ae94a-9896-4aae-adb3-60bb9a492bf5
Zhao, Yonghao
a1946ade-15b3-409a-9f81-93919b91065d
Zhu, Y.T.
ddbd5b30-13ca-45a6-9296-ed5b60811efb
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Xu, Cheng
af526865-aee4-4ef6-8174-def5c38149a2
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Balogh, Levente
bc1beb0e-e4dd-4549-9a2d-afda6c91a869
Ungár, Tamás
680ae94a-9896-4aae-adb3-60bb9a492bf5
Zhao, Yonghao
a1946ade-15b3-409a-9f81-93919b91065d
Zhu, Y.T.
ddbd5b30-13ca-45a6-9296-ed5b60811efb
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Xu, Cheng
af526865-aee4-4ef6-8174-def5c38149a2
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Balogh, Levente, Ungár, Tamás, Zhao, Yonghao, Zhu, Y.T., Horita, Zenji, Xu, Cheng and Langdon, Terence G. (2008) Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys. Acta Materialia, 56 (4), 809-820. (doi:10.1016/j.actamat.2007.10.053).

Record type: Article

Abstract

Experiments were conducted on samples of pure Cu and two Cu–Zn alloys to evaluate the influence of the stacking-fault energy (SFE) on microstructural development when processing using high-pressure torsion (HPT). Transmission electron microscopy, X-ray diffraction and hardness measurements were used for microstructural evaluation and the results show consistency between these techniques. Grain sizes in the nanometer range were formed at the edges of the HPT disks, larger submicrometer grains were formed in the disk centers and the measured grain sizes decreased with decreasing SFE. There was negligible twinning in pure Cu but the densities of dislocations and twins increased with increasing Zn content and thus with decreasing SFE. The values of the Vickers microhardness were lower in the centers of the disks for the two Cu–Zn alloy and this is consistent with the low SFE and slow rates of recovery.

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More information

Published date: February 2008
Keywords: copper alloys, high-pressure torsion, severe plastic deformation, stacking-fault energy, x-ray diffraction
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 64174
URI: https://eprints.soton.ac.uk/id/eprint/64174
ISSN: 1359-6454
PURE UUID: 1f7707d8-c533-41d7-be67-5408717ab9dc
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 05 Dec 2008
Last modified: 14 Mar 2019 01:45

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