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材料工程  2015, Vol. 43 Issue (8): 13-18    DOI: 10.11868/j.issn.1001-4381.2015.08.003
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
热处理对7A85铝合金组织和性能的影响
何正林1, 高文理1, 陆政2, 冯朝辉2
1. 湖南大学 材料科学与工程学院, 长沙 410082;
2. 北京航空材料研究院, 北京 100095
Effects of Heat Treatment on Microstructure and Properties of 7A85 Aluminium Alloy
HE Zheng-lin1, GAO Wen-li1, LU Zheng2, FENG Zhao-hui2
1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China
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摘要 采用室温拉伸测试,电导率测试,晶间腐蚀及透射电镜等手段研究不同时效制度对7A85铝合金显微组织,力学性能以及晶间腐蚀性能的影响。结果表明:合金经过峰时效(120℃/24h)处理,抗拉强度,伸长率和电导率分别达到760.8MPa,8.9%和29.7%IACS;合金的主要强化相为GP区,峰时效(T6)合金晶内分布着大量细小而弥散的GP区和少量的η'相。双级时效(120℃/8h+165℃/12h)时,合金抗拉强度及电导率分别达到597.7MPa和38.1%IACS,且随着时效时间的延长,晶间析出相长大粗化,PFZ带宽化,晶间腐蚀敏感性降低。因此,采用120℃/8h+165/12h双级时效可以获得较好的综合性能。
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何正林
高文理
陆政
冯朝辉
关键词 7A85铝合金时效硬化显微组织晶间腐蚀    
Abstract:The influence of heat treatment on microstructure, mechanical properties and intergranular corrosion(IGC) of 7A85 aluminum alloy was investigated by tensile testing, conductivity testing, intergranular corrosion testing and transmission electron microscope. The results show that tensile strength, elongation and conductivity of 7A85 aluminium alloy aged at 120℃/24h are 760.8MPa, 8.9% and 29.7%IACS respectively;the main strengthening precipitates in the alloy are GP zones.While the tensile strength and the conductivity of 7A85 aluminium alloy reach 597.7MPa and 38.1%IACS respectively, after duplex aging at 120℃/8h+165℃/12h, and with increase of aging time, the precipitates in the matrix become coarser and PFZs become broaden, resulting in the susceptibility to IGC decreasing. Therefore, the alloy after duplex aging at 120℃/8h+165℃/12h shows good comprehensive performance.
Key words7A85 aluminum alloy    age hardening    microstructure    intergranular corrosion
收稿日期: 2014-03-01      出版日期: 2015-08-17
1:  TG166.3  
通讯作者: 高文理(1964-),男,副教授,工学博士,从事专业:高性能铝合金的研制及加工成形技术以及铝、镁合金特种铸造工艺,联系地址:湖南省长沙市湖南大学材料学院(410082),E-mail:wenligaohd@163.com     E-mail: wenligaohd@163.com
引用本文:   
何正林, 高文理, 陆政, 冯朝辉. 热处理对7A85铝合金组织和性能的影响[J]. 材料工程, 2015, 43(8): 13-18.
HE Zheng-lin, GAO Wen-li, LU Zheng, FENG Zhao-hui. Effects of Heat Treatment on Microstructure and Properties of 7A85 Aluminium Alloy. Journal of Materials Engineering, 2015, 43(8): 13-18.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.08.003      或      http://jme.biam.ac.cn/CN/Y2015/V43/I8/13
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