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Co-Precipitation, Strength and Electrical Resistivity of Cu–26 wt % Ag–0.1 wt % Fe Alloy

by Rui Li 1,2, Engang Wang 1,3,* and Xiaowei Zuo 1,3,*
1
Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China
2
School of Materials Science and Engineering, Northeastern University, Shenyang 110004, China
3
School of Metallurgy, Northeastern University, Shenyang 110004, China
*
Authors to whom correspondence should be addressed.
Materials 2017, 10(12), 1383; https://doi.org/10.3390/ma10121383
Received: 21 November 2017 / Revised: 3 December 2017 / Accepted: 1 December 2017 / Published: 3 December 2017
(This article belongs to the Section Manufacturing Processes and Systems)
Both a Cu–26 wt % Ag (Fe-free) alloy and Cu–26 wt % Ag–0.1 wt % Fe (Fe-doping) alloy were subjected to different heat treatments. We studied the precipitation kinetics of Ag and Cu, microstructure evolution, magnetization, hardness, strength, and electrical resistivity of the two alloys. Fe addition was incapable of changing the precipitation kinetics of Ag and Cu; however, it decreased the size and spacing of rod-shaped Ag precipitates within a Cu matrix, because Fe might affect the elastic strain field and diffusion field, suppressing the nucleation of Ag precipitates. Magnetization curves showed that γ-Fe precipitates were precipitated out of the Cu matrix, along with Ag precipitates in Fe-doping alloy after heat treatments. The yield strength of the Fe-doping alloy was higher than that of the Fe-free alloy, and the maximum increment was about 41.3%. The electrical conductivity in the aged Fe-doping alloy was up to about 67% IACS (International Annealed Copper Standard). Hardness, strength, and electrical resistivity were intensively discussed, based on the microstructural characterization and solute contributions of both alloys. Our results demonstrated that an increasing fraction of nanoscale γ-Fe precipitates and decreasing spacing between Ag precipitates resulted in the increasing strength of the Fe-doping alloy. View Full-Text
Keywords: Cu–Ag alloy; Fe addition; co-precipitation; precipitation kinetics; hardness; electrical resistivity Cu–Ag alloy; Fe addition; co-precipitation; precipitation kinetics; hardness; electrical resistivity
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Li, R.; Wang, E.; Zuo, X. Co-Precipitation, Strength and Electrical Resistivity of Cu–26 wt % Ag–0.1 wt % Fe Alloy. Materials 2017, 10, 1383.

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