Grain Refinement and High-Performance of Equal-Channel Angular Pressed Cu-Mg Alloy for Electrical Contact Wire

Metals

Aibin Ma¹  Chengcheng Zhu²  Jianqing Chen²  Jinghua Jiang²  Dan Song²  Shizhan Ni²  Qing He² 

[1] College of Mechanics and Materials, Hohai University, Nanjing 210098, China;

关键词: severe-plastic-deformation (SPD);    contact wire;    Cu-Mg alloy;    ultrafine grained (UFG);    conductivity;    strength;   

DOI  :  10.3390/met4040586

来源: mdpi

【 摘 要 】

Multi-pass equal-channel angular pressing (EACP) was applied to produce ultrafine-grained (UFG) Cu-0.2wt%Mg alloy contact wire with high mechanical/electric performance, aim to overcome the catenary barrier of high-speed trains by maximizing the tension and improving the power delivery. Microstructure evolution and overall properties of the Cu-Mg alloy after different severe-plastic-deformation (SPD) routes were investigated by microscopic observation, tensile and electric tests. The results show that the Cu-Mg alloy after multi-pass ECAP at 473 K obtains ultrafine grains, higher strength and desired conductivity. More passes of ECAP leads to finer grains and higher strength, but increasing ECAP temperature significantly lower the strength increment of the UFG alloy. Grain refinement via continuous SPD processing can endow the Cu-Mg alloy superior strength and good conductivity characteristics, which are advantageous to high-speed electrification railway systems.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.