Effect of Magnesium Content on Tensile Strength and Elongation of Cu-Mg Alloy

Author of the article:TANG Haoyuan, ZHANG Wei, SUN Yanhua, LI Yuzhang, CHEN Yue, FENG Shaotang

Author's Workplace：State Key Laboratory of Pressure Hydrometallurgy Technology for Co-production of Non-ferrous Metal Resources, Kunming Metallurgy Research Institute Co., Ltd., Kunming 650031, China

Key Words：copper-magnesium alloy; tensile strength; elongation

Abstract：The wear resistance of copper-magnesium alloy contact wire is better than that of copper-silver alloy contact wire of the same specification, which is widely used in overhead contact network of high-speed railway with speed of 330 km and below. Copper-magnesium alloy contact wire products require high technical level of equipment during melting, casting and processing. High or low magnesium content will affect the casting quality and the possibility of cold working. In this paper, copper-magnesium alloys with different magnesium content were prepared by controlling different pressures using the copper-magnesium intermediate alloy with 15% magnesium content and copper raw materials in a vacuum melting furnace. The effects of different magnesium content on the tensile strength and elongation of the alloys were studied. The results show that the tensile strength increases and the elongation decreases with the magnesium content in the range of 1%.