时效工艺对2000系高强铝合金慢应变速率拉伸性能的影响  

Effects of Aging Process on the Slow Strain Tensile Properties of 2000 Series High Strength Aluminum Alloy

作　　者：罗先甫[1] 查小琴[1] 郑国华[1] 张利娟[1] 赵阳[1] 

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《材料开发与应用》2015年第4期24-29,共6页Development and Application of Materials

摘　　要：通过慢应变速率拉伸测试、金相、扫描电镜及透射电镜分析等研究了Al-3.88Cu-1.18Mg-0.31Mn铝合金在T6、T8、T3时效状态时的应力腐蚀开裂(SCC)行为。结果表明:在T6、T8及T3时效态下,合金的应力腐蚀开裂敏感性依次降低。合金应力腐蚀与晶间腐蚀具有正相关性,表现为电化学腐蚀特征,晶界与晶内电位差的大小决定了应力腐蚀开裂敏感性的高低,其与晶界及其附近区域的微观组织特征紧密相关。The stress corrosion cracking（ SCC） performance of aluminum alloy Al-3. 88Cu-1. 18Mg-0. 31 Mn in T6,T8 and T3 temper was investigated by using slow strain rate tension testing,optical microscope,scanning electron microscope and transmission electron microscope. The results show that the stress corrosion cracking susceptibility reduces successively at T6,T8 and T3 temper. Stress corrosion has positive correlation with intergranular corrosion,which shows electrochemical corrosion characteristics. Potential difference between grain and grain boundaries determines the stress corrosion cracking susceptibility which is closely related with the microstructure of the grain boundary and its adjacent periphery.

关 键 词：时效工艺 高强铝合金 慢应变速率拉伸 应力腐蚀开裂敏感性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]