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

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), pp. 269-281. (doi:10.1016/j.actamat.2011.09.058).

Record type: Article


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


Local EPrints ID: 335456
ISSN: 1359-6454
PURE UUID: 4fd699f1-babb-4d7b-a419-444655a20263
ORCID for T.G. Langdon: ORCID iD

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Date deposited: 14 Mar 2012 14:20
Last modified: 18 Jul 2017 06:10

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Author: Y.Z. Tian
Author: J.J. Li
Author: P. Zhang
Author: S.D. Wu
Author: Z.F. Zhang
Author: M. Kawasaki
Author: T.G. Langdon ORCID iD

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