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材料工程  2014, Vol. 0 Issue (6): 11-17    DOI: 10.11868/j.issn.1001-4381.2014.06.003
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
预析出对2519A铝合金局部腐蚀性能的影响
刘瑛1, 张品芳1, 陈兰君1, 张合2, 张新明3, 耿占吉3
1. 南京理工大学 材料科学与工程学院, 南京 210094;
2. 南京理工大学 机械学院, 南京 210094;
3. 中南大学 材料科学与工程学院, 长沙 410083
Effect of Pre-precipitation on Localized Corrosion Properties of 2519A Aluminum Alloy
LIU Ying1, ZHANG Pin-fang1, CHEN Lan-jun1, ZHANG He2, ZHANG Xin-ming3, GENG Zhan-ji3
1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
3. School of Materials Science and Engineering, Central South University, Changsha 410083, China
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摘要 研究了固溶后预析出对2519A铝合金的拉伸性能、恒载荷应力腐蚀和晶间腐蚀性能的影响,并通过透射电镜进行组织观察,分析了影响机理。结果表明:预析出提高了T6态2519A合金局部腐蚀性能,合金应力腐蚀开裂时间由无析出时的1天提高至9天,晶间腐蚀最大深度由220μm下降到120μm,而抗拉强度仍有400MPa。合适的预析出也可提高T8态合金局部腐蚀性能,开裂时间由无析出时的10天可增加到520℃析出时的14.9天,晶间腐蚀的最大深度和腐蚀形貌无明显变化,而预析出的抗拉强度有所降低。合适的预析出使T6与T8态样品晶界析出相粗化,间距加大,这是局部腐蚀性能提高的主要原因。
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刘瑛
张品芳
陈兰君
张合
张新明
耿占吉
关键词 2519A铝合金预析出晶间腐蚀应力腐蚀开裂    
Abstract:The influence of pre-precipitation on tensile mechanical properties, stress corrosion cracking and intergranular corrosion properties of 2519A aluminium alloy was studied. The mechanism was analyzed through microstructure observation by transmission electron microscope. The results show that for 2519A-T6 samples, pre-precipitation can improve localized corrosion resistance. Stress corrosion cracking time by constant load test increases from 1 day (no pre-precipitation) to 9 days (pre-precipitation). Maximum intergranular corrosion depth decreases from 220μm to 120μm while ultimate tensile strength still remains 400MPa. Localized corrosion properties of 2519A-T8 samples are improved by pre-precipitation. Cracking time prolongs from 10 days (no pre-precipitation) to 14.9 days (pre-precipitation). Maximum intergranular corrosion depth and its corrosion morphology remain unchanged while ultimate tensile strength of pre-precipitation T8-samples is decreased. Proper pre-precipitation can enhance the discontinuity and coarsening of precipitates in grain boundary for both T6 and T8 temper, in which is due to enhancement of localized corrosion resistance.
Key words2519A aluminum alloy    pre-precipitation    intergranular corrosion    stress corrosion cracking
收稿日期: 2012-07-20     
1:  TG146  
基金资助:国家重点基础研究发展计划项目(2005CB623700);国家青年科学基金项目(51304123);教育部科学技术研究重大项目(311035)
作者简介: 刘瑛(1978- ),女,讲师,博士,现从事轻合金塑性加工与材料组织性能控制的研究,联系地址:江苏南京玄武区孝陵卫200号南京理工大学材料科学与工程学院(210094),E-mail:liuying517@njust.edu.cn
引用本文:   
刘瑛, 张品芳, 陈兰君, 张合, 张新明, 耿占吉. 预析出对2519A铝合金局部腐蚀性能的影响[J]. 材料工程, 2014, 0(6): 11-17.
LIU Ying, ZHANG Pin-fang, CHEN Lan-jun, ZHANG He, ZHANG Xin-ming, GENG Zhan-ji. Effect of Pre-precipitation on Localized Corrosion Properties of 2519A Aluminum Alloy. Journal of Materials Engineering, 2014, 0(6): 11-17.
链接本文:  
http://jme.biam.ac.cn/jme/CN/10.11868/j.issn.1001-4381.2014.06.003      或      http://jme.biam.ac.cn/jme/CN/Y2014/V0/I6/11
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