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 perfor-mance changes of Al-0.2Zr-0.06Sc alloy wires produced by three processing paths are investigated.Re-sults 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 dy-namic 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.
基金项目
Key Project of Research and Development in Yunnan Province(202103AN080001-002)
Key Project of Research and Development in Yunnan Province(202202AG050007-4)
Key Project of Yunnan Fundamental Research(202101AS070017)
Kunming University of Science and Technology Analysis and Testing Fund(2022M20202230013)
NETL
NSTL
万方数据