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Microstructures, strengthening mechanisms and fracture behavior of Cu-Ag alloys processed by high-pressure torsion |
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| Authors: | YZ TianJJ Li P ZhangSD Wu ZF Zhang M KawasakiTG Langdon |
| Affiliation: | a Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People’s Republic of China b Department of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, USA c Materials Research Group, School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, UK |
| 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 μm 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. |
| Keywords: | Eutectic Cu-Ag alloy High-pressure torsion Microstructure Hardness Fracture |
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