(1. 浙江大學(xué) 材料科學(xué)與工程系，杭州 310027；2. 北京科技大學(xué) 材料科學(xué)與工程學(xué)院，北京 100083)
摘 要: 采用冷拉拔結(jié)合中間熱處理制備纖維復(fù)合Cu-12%Ag和Cu-12%Ag-0.3%RE合金，在不同溫度對合金進行退火，分析合金中稀土化合物形態(tài)與結(jié)構(gòu)，研究合金組織性能在退火過程中的變化規(guī)律及稀土元素的作用。結(jié)果表明：合金中初生富Cu枝晶及共晶體在拉拔過程中形成纖維復(fù)合組織，并在
關(guān)鍵字: 銅合金；稀土元素；退火；顯微組織；強度；電導(dǎo)率
（1. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; 2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Cu-12%Ag and Cu-12%Ag-0.3%RE alloys were manufactured by cold drawing combined with intermediate heat treatments. The drawn alloys were annealed at different temperatures. The morphology and structure of the compound particles in Cu-12%Ag-0.3%RE were examined. The changes of the microstructure and properties with annealing temperature and the effect of rare earth additions were investigated. The results show that the primary Cu-rich dendrites and eutectic colonies in the alloys evolve into filamentary structure during the drawing deformation. The filamentary structure changes into recrystallization structure of equiaxed grains during annealing at 500 ℃. The strength of the alloy decreases whereas the conductivity increases with increasing annealing temperature. Adding 0.3% rare earth elements into Cu-12%Ag alloys (Cu, Ag)6(Ce, La) compound particles form and the softening resistance in annealing are increased at temperatures lower than 300 ℃, whereas the conductivity are slightly decreased. The compound particles are hardly deformed during the drawing process and hardly influence the recrystallizaion behavior of the filamentary structure during the annealing process.
Key words: Cu alloy; rare earth element; annealing; microstructure; strength; electrical conductivity
