(1. 河海大學(xué) 力學(xué)與材料學(xué)院，南京 210098；2. 常州市河海科技研究院有限公司，常州 213164；3. 中鐵建電氣化局集團(tuán) 康遠(yuǎn)新材料有限公司，江陰 214521)
摘 要: 采用等通道轉(zhuǎn)角擠壓(ECAP)和后續(xù)熱處理對(duì)高鐵接觸導(dǎo)線用銅鎂合金進(jìn)行微觀組織調(diào)控以獲得優(yōu)良的綜合性能。結(jié)果表明：Cu-0.2%Mg(質(zhì)量分?jǐn)?shù))和Cu-0.4%Mg合金在200 ℃下經(jīng)多道次ECAP加工后，其晶粒組織明顯細(xì)化，微觀硬度和抗拉強(qiáng)度提高明顯，同時(shí)仍保持了良好的導(dǎo)電率和伸長率。ECAP加工后Cu-Mg合金經(jīng)不同溫度退火后，其力學(xué)性能有較明顯的下降，而導(dǎo)電率和伸長率有所提高。與Cu-0.2%Mg合金相比，Cu-0.4%Mg合金具有更好的抗高溫軟化能力。
關(guān)鍵字: Cu-Mg合金；高速鐵路；ECAP；退火；力學(xué)性能；導(dǎo)電性能
（1. College of Mechanics and Materials, Hohai University, Nanjing 210098, China;2. Hohai Technology Research Institute Co., Ltd, Changzhou 213164, China;3. China Railway Construction Electrification Bureau Group Kang Yuan New Materials Co., Ltd, Jiangyin 214521, China）
Abstract:The microstructures of Cu-Mg alloys used for high-speed railway contact wire were changed and controlled to obtain excellent overall performance via equal channel angular pressing (ECAP) and subsequent annealing. The results show that multi-pass ECAP at 200 ℃ makes the grain size of Cu-0.2%Mg (mass fraction) and Cu-0.4%Mg alloys obviously refine, which significantly improves their micro-hardness and tensile strength while maintain their good electrical conductivity and elongation. After annealing at different temperatures, the mechanical properties of the ECAP Cu-Mg alloys are obviously declined but their electrical conductivity and elongation are increased. The Cu-0.4%Mg alloy has better resistance of high temperature softening than the Cu-0.2%Mg alloy.
Key words: Cu-Mg alloy; high-speed rail; ECAP; annealing; mechanical property; conductivity
