(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；
2. 湖南泰嘉新材料科技股份有限公司，長(zhǎng)沙 410200；
3. 空軍航空大學(xué) 航空理論系，長(zhǎng)春 130022)
摘 要: 通過(guò)正交試驗(yàn)獲得2519A鋁合金優(yōu)化的二次時(shí)效工藝，并通過(guò)硬度測(cè)試、拉伸測(cè)試、極化曲線分析、晶間腐蝕試驗(yàn)和透射電鏡觀察等方法對(duì)比不同時(shí)效狀態(tài)樣品的力學(xué)性能和耐蝕性能。結(jié)果表明：與等溫時(shí)效相比，二次時(shí)效能提高2519A鋁合金的屈服強(qiáng)度，同時(shí)改善合金的耐蝕性能，這是因?yàn)槎螘r(shí)效后晶內(nèi)形成了細(xì)小彌散的θ″相，同時(shí)晶內(nèi)的普遍脫溶使晶內(nèi)基體與晶界無(wú)沉淀析出帶(PFZ)的電位差減小。
關(guān)鍵字: 2519A鋁合金；二次時(shí)效；力學(xué)性能；耐蝕性能；無(wú)沉淀析出帶
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Bichamp Cutting Technology (Hunan) Co., Ltd., Changsha 410200, China;
3. Department of Aviation Theories, Aviation University of Air Force, Changchun 130022, China）
Abstract:An optimized secondary aging process of 2519A aluminum alloy was obtained via orthogonal design. The mechanical properties and corrosion resistance of 2519A aluminum alloy after different aging processes were compared by hardness test, tensile test, polarization curve analysis, intergranular corrosion test and transmission electronic microscopy. The results show that the yield strength of 2519A aluminum alloy increases, and the corrosion resistance of the alloy is improved by secondary aging process, compared with isothermal aging. This is due to the fine and disperse θ″ phase in the grain and the decrease of potential difference between the grain and grain boundary precipitation free zone (PFZ) because of the universal desoluation in the grain after secondary aging.
Key words: 2519A aluminum alloy; secondary aging; mechanical properties; corrosion resistance; precipitation free zone
