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.
Highlights
Strength and ductility are two of the most important mechanical properties of metallic materials which usually determine the service environment of materials
Second phase was detected in all materials, making it more simpler about μm, and no second phase was detected in all materials, making it more feasible and simpler explore solely the impact of short-range clustering (SRC) on the work-hardening behavior and microstructural evolution in tothese explore solely the impact of SRC on the work-hardening behavior and microstructural evolution alloys
The influence of SRC on the work-hardening behavior of Cu–Ni alloys with high stacking-fault energy (SFE) was investigated under uniaxial compression
Summary
Strength and ductility are two of the most important mechanical properties of metallic materials which usually determine the service environment of materials. A large number of experimental results [1,2,3] show that there is a natural contradiction between strength and ductility which has greatly restrained the application and development of metallic components. Some further work [8,9,10] reported that the work-hardening capacity of metallic materials was improved significantly by introducing a gradient structure, where fine grains undertake strength, while coarse grains ensure work-hardening capacity and thereby decent ductility. These attempts provided excellent designing principles and technology, the extremely rigorous and complicated conditions have greatly limited the broad industrial applications
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