(中南大學(xué) 材料科學(xué)與工程學(xué)院， 長(zhǎng)沙 410083)
摘 要: 通過(guò)硬度、 電阻檢測(cè)以及光學(xué)顯微鏡、 透射電鏡觀察， 研究了AA3003鋁合金在退火過(guò)程中的析出行為以及對(duì)合金顯微組織的影響。 結(jié)果表明： 低溫階段(＜450 ℃)， 大的冷軋變形量將導(dǎo)致更多的析出； 在高溫階段(＞450 ℃)時(shí)的析出與冷軋變形量無(wú)關(guān)； 在300 ℃退火時(shí)， 析出發(fā)生在再結(jié)晶之前， 導(dǎo)致晶粒粗大； 而在500 ℃退火時(shí)， 再結(jié)晶發(fā)生在析出之前， 可獲得細(xì)小的等軸晶。 對(duì)于鋁電解電容器用AA3003鋁合金陰極箔的生產(chǎn)， 宜采用500 ℃, 30 min中間退火制度， 這樣既可以保證大量彌散相的析出， 又可以獲得細(xì)晶組織， 有利于提高陰極箔比的電容。
關(guān)鍵字: AA3003鋁合金； 陰極箔； 析出； 再結(jié)晶
（ School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: The precipitation behavior of AA3003 aluminum alloy during annealing as well as its effect on the microstructures of alloys was investigated by means of hardness, electrical resistivity measurements, optical microscopy and transmission electric microscopy. The results show that in the low temperature region(＜450 ℃)higher cold reduction results in larger amount of precipitates. However, the precipitation at about 500 ℃ is independent on the cold deformation reduction. On annealing at 300 ℃, precipitation is prior to recrystallization, the grains become coarse. But on annealing at 500 ℃, recrystallization is prior to precipitation, and fine grains are obtained. As for the production of AA3003 aluminium foil for cathode of aluminium electrolytic capacitor, the intermediate annealing process of 500 ℃, 30 min is suitable, because a large amount of precipitates occurs and fine grains are obtained, which is in favor of the increase of specific capacitance of the cathode foil.
Key words: AA3003 aluminium alloy; cathode foil; precipitation; recrystallization
