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本文介绍一种Ni含量小于5％,并加入少量Al、Si、Cr、Mg等元素的高强度导电铜合金(CE-4合金),研究了时效温度和时间以及变形量对该合金机械性能的影响,以及室温电阻率和弹性模量与温度的关系,并测试了几种温度下的应力松弛性能。结果表明,在36％变形量下,最佳的热处理制度为450℃时效1h,此时合金具有较好的机械性能;σ_b～93kg/mm~2,σ_(0.2)～87kg/mm~2,δ～5％,Hv～273。室温下和近300℃高温下的弹性模量分别为13900kg/mm~2和12800kg/mm~2,相应的电阻率分别为0.086和0.113Ωmm~2/M。变形量达36％能显著提高合金的强度和硬度。该合金有良好的抗应力松弛能力,在150°和200℃保温100小时后,试样的分别保持～96％和～85％的初始应力。故该合金具有与铍青铜相近的弹性和导电性:而耐高温性则优于铍青铜:可用作175～200℃工作的弹性元件。
In this paper, we introduce a high strength conductive copper alloy (CE-4 alloy) with less than 5% Ni content and a small amount of Al, Si, Cr, Mg and other elements. The effect of aging temperature and time and deformation on the mechanical properties Influence, as well as the room temperature resistivity and elastic modulus and temperature, and tested the stress relaxation properties at several temperatures. The results show that the optimum heat treatment regime is 450 ℃ for 1 h at 36% deformation, and the alloy has good mechanical properties; σ_b ~ 93kg / mm ~ 2, σ_ (0.2) ~ 87kg / mm ~ δ ~ 5%, Hv ~ 273. The elastic modulus at room temperature and the temperature near 300 ℃ are 13900kg / mm ~ 2 and 12800kg / mm ~ 2 respectively, the corresponding resistivities are 0.086 and 0.113Ωmm ~ 2 / M, respectively. 36% deformation can significantly improve the strength and hardness of the alloy. The alloy has good resistance to stress relaxation, the specimens maintain ~ 96% and ~ 85% initial stress after 100 hours incubation at 150 ° C and 200 ° C, respectively. Therefore, the alloy has the similar elasticity and electrical conductivity as beryllium bronze: the high temperature resistance is superior to the beryllium bronze: It can be used as the elastic element working at 175 ~ 200 ℃.