【作者】 宋明昭；

【导师】 涂铭旌；

【作者基本信息】 四川大学 ， 材料学， 2006， 硕士

【摘要】 现代科学技术的发展,在超高磁场导线、架空导线、集成电路引线框架材料等很多领域对铜合金提出了更高的要求。要求铜合金同时具有高强度、高硬度、高导电的性能。但是对铜合金来说,高强度和高导电率是一对矛盾,如何在导电率下降不大的条件下提高铜合金的强度成为各国研究者共同的难题。在铜合金所有的强化方式中,合金化法是一种重要的手段,特别适合于大规模工业生产。目前,常用的添加合金元素集中在Cr、Zr、Nb、Fe、Re等几种元素,缺乏对新元素的开发利用,我国更是缺少新型铜合金的研制。本课题在前人工作的基础上,利用四川特有的Te资源优势,制备了一系列不同含量的铜碲合金,并通过添加Mg、Cr等元素,利用不同的强化方式,调节合金性能以达到满意的结果。本文运用万能材料试验机、硬度机和电阻仪等手段来研究拉拔加工和热处理过程中铜合金力学性能和电学性能的变化,运用SEM、XRD、电子探针来研究合金元素的加入对材料微观结构的影响,从而弄清导致合金性能变化的本质。同时,考虑到实际工程中的应用,对部分合金的耐腐蚀性和抗氧化性能作了初步的研究。研究结果表明:1、经过冷拔处理的铜碲合金,时效处理后生成析出相Cu2Te,对铜的导电率影响不大,随着Te含量的增加,合金的抗拉强度提高,但是提高能力非常有限。应用失重法对铜碲合金在3.5%NaCl溶液中进行耐蚀性测试,实验证明,由于铸造性能的改善,铜碲合金表现出比相同铸造条件下的纯铜更好的耐蚀性。2、在铜碲二元合金中加入一定含量的第三组元Mg,可使合金的抗拉强度比铜碲合金提高40%,导电率也下降到70%IACS。经过SEM和XRD的分析,Mg元素主更多还原

【Abstract】 With the development of the new science and technology, to copper alloys higher performance are required in extremely high magnets, trains and IC(Integrated circuit.) et al. To copper alloys not only the high conductivity but also the high strength and the high hardness are required. But to copper alloy, there exists a contradiction between high conductivity and high strength. How to improve the strength of the alloy and keep high conductivity becomes the same object of different country’s researches. Among all the strengthening method, alloying method is an important way, especially suitable to cosmically industry production. At the present, Cr、Zr、Nb、Fe、Re are often used alloy elements to the copper, short of studying new copper alloys. To our country, this demand is more urgent.Based on the work of others, different concentration Cu-Te alloys are produced taking the advantage of Te resource in Sichuan province. Meanwhile, in order to get higher strength, Mg and Cr are added as the third composition.In this paper, universal material testing machine, hardness machine and a direct current four-probe are used to investigate the change of copper alloys’strength and conductivity after cold working and heat treatment. To study the microstructure, SEM, XRD, and electron probe are applied. Considering the possible use in practice situation, corrosion and oxidation performance has also been researched. Such conclusions can be drawn in our study.A phase Cu2Te is formed after heat treatment in Cu-Te alloy, and this phase has less influence to the copper’s conductivity. With the increase of Te content, the tensile strength is improved, but the effect is limited. After immersion in the 3.5% sodium chlorine solution at 25℃, Cu-Te alloys show better corrosion-resistance than pure copper.更多还原