镁含量对铜镁合金抗拉强度和伸长率的影响

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

铜镁合金接触线的耐磨耗性能优于相同规格的铜银合金接触线,被广泛应用于高速铁路时速330 km及以下的接触网。铜镁合金接触线产品在熔炼、铸造和加工过程中对设备的技术水平要求较高。镁的含量过高或者过低都会影响铸造质量和冷加工的可能性。本文以镁含量15%的铜镁中间合金和铜为原料,通过控制不同压强,利用真空熔炼炉制备了不同镁含量的铜镁合金,研究了不同镁含量对合金抗拉强度和伸长率的影响。结果表明,镁含量在1%范围内,镁含量越高,铜镁合金的抗拉强度越高,伸长率越小。

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%.