期刊
METALS
卷 9, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/met9020151
关键词
Cu-Ni alloy; work-hardening; short-range clustering; stacking-fault energy; planar slip; dislocation structure
资金
- National Natural Science Foundation of China (NSFC) [51571058, 51871048]
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.
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