应力腐蚀敏感性的影响
(中南大学 材料科学与工程学院， 长沙 410083)
摘 要: 选用3种不同的热处理工艺对2519铝合金板材进行处理， 采用测定试样在腐蚀前后力学性能的变化即腐蚀的力学性能指标Kσ和Kδ来评定2519铝合金的应力腐蚀敏感性。 结果表明： 2519铝合金板材经先高温后低温的双级时效处理(180℃，3h+145℃， 24h)后力学性能最好， 抗应力腐蚀性能最差； 而经形变热处理(20℃， 100h+冷加工15%+145℃，21h)后的力学性能较好， 抗应力腐蚀性能最好； 过时效状态(180℃，30h)下力学性能最差， 抗应力腐蚀性能适中。
关键字: 2519铝合金； 热处理； 力学性能； 应力腐蚀敏感性
2519 aluminum alloy plate
（School of Material Science and Engineering,
Central South University, Changsha 410083, China）
Abstract:Three different heat treatment processes were selected for 2519 aluminum alloy plate, the stress corrosion sensitivity was evaluated by difference of mechanical properties between corroded samples and un-corroded samples such as Kσ and Kδ. The results show that the stress corrosion resistance of the alloy is the worst but its mechanical properties are the best at two-stage aging state of 180℃, 3h+145℃, 24h; the stress corrosion resistance is the best but the mechanical properties are in the middle of three states at the thermal-mechanical treatment state of 20℃, 100h+cool deformation 15%+145℃, 21h; the stress corrosion resistance is in the middle of three states but the mechanical properties are the worst at the state of over-aging of 180℃, 30h.
Key words: heat treatment; 2519 aluminum alloy; mechanical property; stress corrosion sensitivity
