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Metals 2015, 5(4), 2119-2127; doi:10.3390/met5042119

Liquid Phase Separation and the Aging Effect on Mechanical and Electrical Properties of Laser Rapidly Solidified Cu100xCrx Alloys

1
School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, China
2
Surface and Microstructure Engineering Group, Department of Materials and Manufacturing Technology, Chalmers University of Technology, SE-41296, Gothenburg, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 18 September 2015 / Revised: 3 November 2015 / Accepted: 6 November 2015 / Published: 12 November 2015
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Abstract

Duplex structure Cu-Cr alloys are widely used as contact materials. They are generally designed by increasing the Cr content for the hardness improvement, which, however, leads to the unfavorable rapid increase of the electrical resistivity. The solidification behavior of Cu100−xCrx (x = 4.2, 25 and 50 in wt.%) alloys prepared by laser rapid solidification is studied here, and their hardness and electrical conductivity after aging are measured. The results show that the Cu-4.2%Cr alloy has the most desirable combination of hardness and conductive properties after aging in comparison with Cu-25%Cr and Cu-50%Cr alloys. Very importantly, a 50% improvement in hardness is achieved with a simultaneous 70% reduction in electrical resistivity. The reason is mainly attributed to the liquid phase separation occurring in the Cu-4.2%Cr alloy, which introduces a large a View Full-Text
Keywords: laser cladding; Cu-Cr alloy; liquid phase separation; electrical conductivity laser cladding; Cu-Cr alloy; liquid phase separation; electrical conductivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Si, S.-H.; Zhang, H.; He, Y.-Z.; Li, M.-X.; Guo, S. Liquid Phase Separation and the Aging Effect on Mechanical and Electrical Properties of Laser Rapidly Solidified Cu100xCrx Alloys. Metals 2015, 5, 2119-2127.

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