Abstract
To apply the electric component with high efficiency, the softening problem of material should be improved. Cu-Cr alloys are recognized to be proper materials to be applied. However, the softening problem has not been solved yet. In this study, the effect of Ti and Al on mechanical property and electrical conductivity in Cu-Cr alloy was investigated. Cr content is designed to up to 0.25 wt.% in order to be expected to improve electrical conductivity. During fabrication processing, microstructure identification, Cr concentration, lattice parameter, and micro-hardness in copper matrix were measured. Then, aging condition was investigated. Resistance about over-aging is increased compared to Cu-Cr and Cu-Cr-Al alloy added to Ti. The hardness and electrical conductivity are discussed by the working conditions and heat treatment, such as rolling, solid-solution treatment, and aging process, which improve the formability also at the optimum condition. Moreover, the role of Ti contents is studied. In the Cu-Cr alloys, the addition of both Al and Ti contents keeps the hardness from being reduced. As a result, the precipitation of Cr particles and the obstacle by Al and Ti contents to be softened are observed in this study.
Highlights
In the electric industries, to apply the electrical parts of electrical appliance and vehicle, which are improving performance, such as electrical power transmission and electrical conductor, both high strength and good electrical conductivity should be achieved [1,2,3,4,5,6,7,8].The certain required properties can be obtained by controlling the chemical composition in alloys [9,10]
Analysis and evaluations were performed with FactSage program (ThermFact Inc. & GTT-Technologies, Montreal, Canada), Spectrometer (Agilent, Santa Clara, CA, USA), SEM/EDS, XRD, Electron probe micro-analyzer (EPMA, AMETEK, Berwyn, PA, USA), Hardness, Electrical conductivity
Cu-Cr alloy with Al and Ti is investigated by microstructure identifithis study, Cu-Cr alloy with andparameter
Summary
To apply the electrical parts of electrical appliance and vehicle, which are improving performance, such as electrical power transmission and electrical conductor, both high strength and good electrical conductivity should be achieved [1,2,3,4,5,6,7,8].The certain required properties can be obtained by controlling the chemical composition in alloys [9,10]. There are requirements of electrical industry, these electrical and mechanical properties cannot be achieved generally. If the mechanical strength increases, the electrical conductivity decreases, such as trade-off relationship. Many researchers have studied to improve both strength and electrical conductivity widely [1,2,3,4,5,6,7,8]. To solve or minimize the problem of trade-off relationship of material, Cu alloys have been used and studied widely, for its high electrical conductivity. The pure Cu has high electrical conductivity, but low strength and bad resistance of softening at heating condition. The Cu-Cr based alloys are recognized as the key to solve the problem
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