(中南大學 材料科學與工程學院，長沙 410083)
摘 要: 以Cu-2.5Fe-0.03P高強高導銅合金帶材為研究對象，測試不同處理狀態(tài)合金板材的力學性能和電學性能，采用金相和電子顯微分析方法研究該合金不同加工熱處理狀態(tài)下的組織與性能演變規(guī)律及其時效析出特性。并在此基礎上研究微量元素Fe和P在合金中的存在形式和作用機制。結果表明：Cu-2.5Fe-0.03P合金熱軋后在線固溶態(tài)合金基本上為單相固溶體，合金硬度、強度和電導率較低，塑性較好，但還存在少數(shù)未溶的Fe相外，在線固溶效果有待進一步改善；軟化退火后的薄帶進一步冷軋并時效后，合金成品薄帶的顯微硬度、抗拉強度、屈服強度、伸長率和電導率分別達到147 HV、456 MPa、271 MPa、10.7%和29.9 S/m；熱軋－在線固溶－冷軋－時效態(tài)Cu-2.5Fe-0.03P合金中的Fe和P以Fe3P和Fe相形式存在，合金的高強度來源于形變熱處理產生的亞結構強化及Fe3P和Fe粒子的析出強化。
關鍵字: Cu-2.5Fe-0.03P合金；顯微組織；性能演變；析出強化
different treatment conditions
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract: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 Fe3P. Sub-structure strengthening coming from the thermo-mechanical treatment and precipitation strengthening of Fe and Fe3P particles is responsible for high strength of the alloy.
Key words: Cu-2.5Fe-0.03P alloy; microstructure; properties evolution; precipitation strengthening
