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Microstructures, strengthening mechanisms and fracture behavior of Cu–Ag alloys processed by high-pressure torsion

Microstructures, strengthening mechanisms and fracture behavior of Cu–Ag alloys processed by high-pressure torsion
Microstructures, strengthening mechanisms and fracture behavior of Cu–Ag alloys processed by high-pressure torsion
Disks of a eutectic Cu–Ag alloy were processed by high-pressure torsion (HPT) up to 20 revolutions to reveal the microstructural evolution and mechanical properties. Both the Cu and Ag phases were thinned continuously with increasing numbers of revolutions. After 20 revolutions, the alternating Cu and Ag phases were significantly refined and became fibrous with dimensions as thin as 5 nm. The strain hardening behavior of the Cu–Ag alloy was characterized after different numbers of HPT revolutions, and a saturation microhardness was attained. It is shown that the tensile fracture mode changed from necking to fully brittle shearing with increasing numbers of revolutions, and some shear offsets with sizes of ?5–20 ?m were observed on the fracture surfaces. Based on the abnormal saturation microhardness value of the eutectic alloy, the strengthening mechanisms of various Cu–Ag alloys are discussed
1359-6454
269-281
Tian, Y.Z.
bda43954-296b-4f4e-8a9d-b35894da6b3e
Li, J.J.
f597fdea-ebdc-4f83-9860-3ab4f8943dca
Zhang, P.
58020138-8fa1-4555-b886-32df14964cfa
Wu, S.D.
6df11381-5cbc-4b9b-ab65-b18b15272221
Zhang, Z.F.
32ae683a-dc37-4bb4-89b3-ecf266a4c4c9
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Tian, Y.Z.
bda43954-296b-4f4e-8a9d-b35894da6b3e
Li, J.J.
f597fdea-ebdc-4f83-9860-3ab4f8943dca
Zhang, P.
58020138-8fa1-4555-b886-32df14964cfa
Wu, S.D.
6df11381-5cbc-4b9b-ab65-b18b15272221
Zhang, Z.F.
32ae683a-dc37-4bb4-89b3-ecf266a4c4c9
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Tian, Y.Z., Li, J.J., Zhang, P., Wu, S.D., Zhang, Z.F., Kawasaki, M. and Langdon, T.G. (2012) Microstructures, strengthening mechanisms and fracture behavior of Cu–Ag alloys processed by high-pressure torsion. Acta Materialia, 60 (1), 269-281. (doi:10.1016/j.actamat.2011.09.058).

Record type: Article

Abstract

Disks of a eutectic Cu–Ag alloy were processed by high-pressure torsion (HPT) up to 20 revolutions to reveal the microstructural evolution and mechanical properties. Both the Cu and Ag phases were thinned continuously with increasing numbers of revolutions. After 20 revolutions, the alternating Cu and Ag phases were significantly refined and became fibrous with dimensions as thin as 5 nm. The strain hardening behavior of the Cu–Ag alloy was characterized after different numbers of HPT revolutions, and a saturation microhardness was attained. It is shown that the tensile fracture mode changed from necking to fully brittle shearing with increasing numbers of revolutions, and some shear offsets with sizes of ?5–20 ?m were observed on the fracture surfaces. Based on the abnormal saturation microhardness value of the eutectic alloy, the strengthening mechanisms of various Cu–Ag alloys are discussed

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More information

e-pub ahead of print date: 29 October 2011
Published date: January 2012
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 335456
URI: https://eprints.soton.ac.uk/id/eprint/335456
ISSN: 1359-6454
PURE UUID: 4fd699f1-babb-4d7b-a419-444655a20263
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 14 Mar 2012 14:20
Last modified: 20 Jul 2019 01:03

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