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Metals 2019, 9(2), 151; https://doi.org/10.3390/met9020151

Impact of Short-Range Clustering on the Multistage Work-Hardening Behavior in Cu–Ni Alloys

Department of Materials Physics and Chemistry, School of Materials Science and Engineering, and Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
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Received: 7 December 2018 / Revised: 25 January 2019 / Accepted: 27 January 2019 / Published: 29 January 2019
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Abstract

The work-hardening behavior of Cu–Ni alloys with high stacking-fault energies (SFEs) is experimentally investigated under uniaxial compression. It is found that, with the increase of Ni content (or short-range clustering, SRC), the flow stress of Cu–Ni alloys is significantly increased, which is mainly attributed to an enhanced contribution of work-hardening. An unexpected multistage (including Stages A, B, and C) work-hardening process was found in this alloy, and such a work-hardening behavior is essentially related to the existence of SRC structures in alloys. Specifically, during deformation in Stage B (within the strain range of 0.04–0.07), the forming tendency to planar-slip dislocation structures becomes enhanced with an increase of SRC content (namely, increase of Ni content), leading to the occurrence of work-hardening rate recovery in the Cu–20at.% Ni alloy. In short, increasing SRC in the Cu–Ni alloy can trigger an unexpected multistage work-hardening process, and thus improve its work-hardening capacity. View Full-Text
Keywords: Cu–Ni alloy; work-hardening; short-range clustering; stacking-fault energy; planar slip; dislocation structure Cu–Ni alloy; work-hardening; short-range clustering; stacking-fault energy; planar slip; dislocation structure
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Han, D.; He, J.-X.; Guan, X.-J.; Zhang, Y.-J.; Li, X.-W. Impact of Short-Range Clustering on the Multistage Work-Hardening Behavior in Cu–Ni Alloys. Metals 2019, 9, 151.

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