Transactions of Materials and Heat Treatment

Title：Effects of cold rolling reduction rate on electrical conductivity and mechanical properties of W-20Cu alloy for automotive electrodes

Authors： Guo Binfeng Liu Weifeng Ma Xintan

Unit： College of Mechanical and Electrical Engineering School of Vehicle and Traffic Engineering Henan University of Science and Technology

KeyWords： W-Cu alloy cold rolling heat treatment microstructure mechanical properties electrical conductivity

ClassificationCode：TG146.1+1

year,vol(issue):pagenumber：2021,46(8):244-250

Abstract：

In order to improve the electrical conductivity and mechanical properties of W-20Cu alloy for auto electrodes prepared by thermal-aluminum reaction process, the properties of the alloy were strengthened by cold rolling and heat treatment at 450 ℃+1 h, and the changes of electrical conductivity and mechanical properties for W-20Cu alloy before and after heat treatment under different cold rolling reduction rates were studied by experimental test, and the performance strengthening mechanism of the alloy was further studied. The results show that the size and quantity of precipitates increase significantly after heat treatment, and the larger precipitates and many fine precipitates are formed in the cold rolled alloy matrix, which are dispersed in the Cu matrix. Then, the higher electrical conductivity of cold rolled alloy is obtained after heat treatment, the hardness of alloy is significantly improved after increasing the cold rolling reduction rate, and the hardness of alloy increases to 118.6 HV when the reduction rate reaches 80%. Finally, the strength and plasticity of alloy are improved after heat treatment, the best comprehensive property of cold rolled alloy after the heat treatment at 450 ℃+1 h

is obtained. When the reduction rate is 80%, the brittle fracture structure forms in the fracture of alloy, and a large number of dimples are produced in the fracture area after heat treatment, which shows the phenomenon of ductile fracture.

Funds：

河南省高等教育教改基金项目（2019SJGLX512）；河南省高等学校重点科研项目(15A460019)

郭斌峰（1977-），男，硕士，讲师 E-mail：gbf19770311@126.com

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