Effects of processing paths on the microstructure, mechanical properties and electrical conductivity of dilute Al-Zr-Sc alloy conductive wires

doi:10.1016/j.jmst.2023.11.060

Abstract

Abstract: Understanding and clarifying the evolution of microstructure and performance of Al-Zr-Sc alloy wires during processing paths is a crucial issue in developing heat-resistant conductors with high strength and high electrical conductivity (EC). In this study, the microstructure evolution and corresponding performance changes of Al-0.2Zr-0.06Sc alloy wires produced by three processing paths are investigated. Results indicate that ageing treatment + hot extrusion + cold drawing processing path can produce the highest strength Al-Zr-Sc wires attributed to favorable interactions among precipitation strengthening of Al₃(Zr,Sc) phases, grain boundary strengthening and dislocation strengthening. High EC is attained by the hot extrusion + ageing treatment + cold drawing processing path, which reveals the importance of dynamic precipitation of Al₃Sc phases during hot extrusion and further precipitation of solute atoms during ageing treatment for improving the EC. The processing path using hot extrusion + cold drawing + ageing treatment achieves the highest EC of the Al-Zr-Sc wire, but the strength decreases significantly due to the loss of dislocation strengthening. Additionally, the pinning effect of Al₃Sc and Al₃(Zr,Sc) ensures good heat resistance of Al-Zr-Sc wires. These results provide guidance for the process design of Al-Zr-Sc wires with variable combinations of strength and EC.

Key words: Al-Zr-Sc alloy, Process optimization, Mechanical properties, Electrical conductivity, Heat resistance

Siyue Fan, Zhenhua Li, Wenlong Xiao, Peng Yan, Jiawen Feng, Qingwei Jiang, Jing Ma, Yuqi Gong. Effects of processing paths on the microstructure, mechanical properties and electrical conductivity of dilute Al-Zr-Sc alloy conductive wires[J]. J. Mater. Sci. Technol., 2024, 188: 202-215.

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