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

作　　者：Siyue Fan Zhenhua Li Wenlong Xiao Peng Yan Jiawen Feng Qingwei Jiang Jing Ma Yuqi Gong 

机构地区：[1]School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China [2]Yunnan Innovation Institute of Beihang University,Kunming 650093,China [3]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [4]Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China

出　　处：《Journal of Materials Science & Technology》2024年第21期202-215,共14页材料科学技术（英文版）

基　　金：financially supported by the Key Project of Research and Development in Yunnan Province(Nos.202103AN080001-002 and 202202AG050007-4);Key Project of Yunnan Fundamental Research(No.202101AS070017);the Kunming University of Science and Technology Analysis and Testing Fund(No.2022M20202230013).

摘　　要：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 Al_(3)(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 Al_(3)Sc 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 Al_(3)Sc and Al_(3)(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.

关 键 词：Al-Zr-Sc alloy Process optimization Mechanical properties Electrical conductivity Heat resistance 

分 类 号：TG14[一般工业技术—材料科学与工程]