Abstract
As common conductive materials, Al wires are used on overhead transmission lines under long-term heating conditions. In this study, the strength degradation behavior and the strength-electrical conductivity relation of the commercially pure Al wires (CPAWs) and the Al-Fe wires (AFWs) annealed at various temperatures were investigated based on the microstructure evolution. The strength degradation rate of the AFW is always higher than that of the CPAW. A linear trade-off relation between strength and electrical conductivity for the annealed Al wires are clarified. The results reveal that the mechanisms behind the trade-off relation between the strength and the electrical conductivity for the annealed CPAWs and the annealed AFWs are the recovery of dislocations and the obvious increase of grain width, which leads to the decrease of strength and the increase of electrical conductivity. The coalescence of precipitate in the AFW leads to the obvious decrease of strength, which results in the higher strength degradation rate for the AFW as compared with that for the CPAW. Consequently, the principle of microstructure design for anti-degradation of Al wire is presented.
Highlights
Au, Ag, Cu, and Al are four kinds of excellent conductive materials, among which Al—depending on its excellent comprehensive performance—is widely used on the overhead transmission line as the outer layer of Al conductor steel reinforced (ACSR) [1,2,3,4,5]
commercially pure Al wires (CPAWs) and the annealed Al-Fe wires (AFWs) were investigated in this work
The decrease of yield strength and the increase of electrical conductivity (EC) were found in the CPAWs and the AFWs, which shows a linear trade-off relation
Summary
Ag, Cu, and Al are four kinds of excellent conductive materials, among which Al—depending on its excellent comprehensive performance—is widely used on the overhead transmission line as the outer layer of Al conductor steel reinforced (ACSR) [1,2,3,4,5]. More and more Al alloy conductors were developed to replace the expensive copper to prepare Al-Fe cable and to replace the steel core to strand Al conductor steel reinforced (ACSR) and all Al alloy conductor (AAAC) to acquire higher energy efficiency [6,7]. Strength and electrical conductivity are two important parameters closely related to safety and energy-saving against various loads and conductor resistance, respectively [8,9]. Due to the resistance of the conductor itself, heat will inevitably be generated in the process
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