不同处理状态下Cu-2.5Fe-0.03P合金的组织与性能演变

以Cu-2.5Fe-0.03P高强高导铜合金带材为研究对象,测试不同处理状态合金板材的力学性能和电学性能,采用金相和电子显微分析方法研究该合金不同加工热处理状态下的组织与性能演变规律及其时效析出特性.并在此基础上研究微量元素Fe和P在合金中的存在形式和作用机制.结果表明:Cu-2.5Fe-0.03P合金热轧后在线固溶态合金基本上为单相固溶体,合金硬度、强度和电导率较低,塑性较好,但还存在少数未溶的Fe相外,在线固溶效果有待进一步改善;软化退火后的薄带进一步冷轧并时效后,合金成品薄带的显微硬度、抗拉强度、屈服强度、伸长率和电导率分别达到147 HV、456 MPa、271 MPa、10.7%和29.9 S/m;热轧-在线固溶-冷轧-时效态Cu-2.5Fe-0.03P合金中的Fe和P以Fe_3P和Fe相形式存在,合金的高强度来源于形变热处理产生的亚结构强化及Fe_3P和Fe粒子的析出强化.

Structure and properties evolution of Cu-2.5Fe-0.03P alloy under different treatment conditions

The mechanical and electrical properties of Cu-2.5Fe-0.03P alloys with high-strength and high- conductivity at different treatment conditions were measured. The microstructures and properties evolution were investigated by OM and TEM. Based on the above mentioned experiment, the existing form and action mechanism of trace Fe and P in the alloy were also studied. The results show that, after hot rolling, on-line solution alloy is mainly a single-phase solid solution. However, there still is a small amount of dissolved Fe phase in the on-line solution alloy. After further rolling and aging, the mechanical properties and electrical conductivity of the alloy are improved further. The micro-hardness, tensile strength, yield strength, elongation and electrical conductivity of the Cu-2.5Fe-0.03P final product are HV 147, 456 Mpa, 271 Mpa, 10.7% and 29.9 S/m, respectively. Fe and P in Cu-2.5Fe-0.03P alloy at hot rolling-on-line solution-cold rolling-aging condition exist in the form of Fe and Fe_3P. Sub-structure strengthening coming from the thermo-mechanical treatment and precipitation strengthening of Fe and Fe_3P particles is responsible for high strength of the alloy.