Deep Cryogenic Treatment Characteristics of a Deformation-Processed Cu-Ni-Co-Si Alloy |
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| Authors: | Keming Liu Xiaochun Sheng Xiaolong Li Mulin Li Zhi Shen Kai Fu Haitao Zhou Andrej Atrens |
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| Affiliation: | 1.Jiangxi Key Laboratory for Precision Actuation and Control, Nanchang Institute of Technology, Nanchang 330099, China; (X.S.); (M.L.); (Z.S.); (K.F.);2.Engineering Technology Research Center, Zhongye Changtian International Engineering Co., Ltd., Changsha 410205, China;3.School of Materials Science and Engineering, Central South University, Changsha 410083, China;4.Centre for Advanced Materials Processing and Manufacturing, The University of Queensland, Brisbane, QLD 4072, Australia; |
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| Abstract: | ![]()
This paper investigated the influence of deep cryogenic treatments (DCT) on the tensile strength, elongation to fracture and conductivity of a deformation-processed Cu-Ni-Co-Si alloy. The tensile properties were measured using a mechanical testing machine. The conductivity was evaluated using a low-resistance tester. The microstructure and precipitated phases were analyzed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), an energy dispersive spectrometer (EDS) and an X-ray diffractometer (XRD). The tensile strength, elongation to fracture and conductivity of the Cu-1.34Ni-1.02Co-0.61Si alloy before and after cold rolling at 47% reduction increased with increasing DCT time and tended to be stable at about 36 h. The microstructure became more uniform after the DCT. The grain size was refined and was smallest after DCT for 48 h. The DCT promoted the precipitation of the solid solution elements Ni, Co and Si from the Cu matrix to form many fine and evenly distributed 20–70 nm spherical second-phase particles in the grains and grain boundaries. |
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| Keywords: | Cu alloy cold rolling DCT microstructure properties |
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