Liquid phase separation and the aging effect on mechanical and electrical properties of laser rapidly solidified cu100−xCrx Alloys
Journal article, 2015

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 amount of well-dispersed sub-micron-scale Cr-rich particulates in the Cu-rich matrix.

Cu-Cr alloy

Laser cladding

Liquid phase separation

Electrical conductivity


S.H. Si

Anhui University of Technology

H. Zhang

Anhui University of Technology

Y. Z. He

Anhui University of Technology

M.X. Li

Anhui University of Technology

Sheng Guo

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering


2075-4701 (eISSN)

Vol. 5 4 2119-2127

Subject Categories

Metallurgy and Metallic Materials

Areas of Advance

Materials Science



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