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材料工程  2019, Vol. 47 Issue (6): 136-143    DOI: 10.11868/j.issn.1001-4381.2017.001061
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
多级时效热处理对7056铝合金析出组织与耐蚀性的影响
范淑敏1,2, 陈送义1,3, 张星临1,2, 周亮1,3, 黄兰萍1,2, 陈康华1,2,3
1. 中南大学 有色金属先进结构材料与制造协同创新中心, 长沙 410083;
2. 中南大学 轻质高强结构材料重点实验室, 长沙 410083;
3. 中南大学 轻合金研究院, 长沙 410083
Influence of multi-stage aging heat treatment on precipitation microstructure and corrosion resistance of 7056 aluminum alloy
FAN Shu-min1,2, CHEN Song-yi1,3, ZHANG Xing-lin1,2, ZHOU Liang1,3, HUANG Lan-ping1,2, CHEN Kang-hua1,2,3
1. Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China;
2. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, China;
3. Light Alloy Research Institute, Central South University, Changsha 410083, China
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摘要 利用透射电子显微镜(TEM)、扫描电子显微镜(SEM)、力学性能测试、电导率测试以及剥落腐蚀、慢应变速率拉伸应力腐蚀(SSRT)、Tafel循环极化曲线等手段研究多级时效热处理对7056铝合金析出组织及耐蚀性的影响。结果表明:过时效再时效热处理后溶质原子二次析出,晶内析出相体积分数增大,晶界析出相粗化断开,无沉淀析出带宽化。与120℃/24h相比,采用120℃/6h预时效工艺有利于晶内细小析出相回溶和粗大相长大。再时效热处理可提高过时效合金的强度和电导率,与峰时效和回归再时效相比,合金的抗拉强度损失不大,电导率明显提升。过时效再时效热处理后,合金晶界处连续阳极溶解被有效避免,抗剥落腐蚀和抗应力腐蚀性能增强。
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范淑敏
陈送义
张星临
周亮
黄兰萍
陈康华
关键词 7056铝合金多级时效晶界析出相耐蚀性    
Abstract:The influence of different multi-stage aging heat treatment on microstructure and corrosion resistance of 7056 alloy was investigated by the measurements of transmission electron microscope(TEM), scanning electron microscope(SEM),mechanical properties and electrical conductivity, exfoliation corrosion, slow strain rate testing(SSRT), Tafel cyclic polarization. The results show that after over-aging and re-aging heat treatment, the solute atoms precipitate again, and the volume fraction of the precipitate in the matrix increases, the grain boundary precipitates coarsen and become discontinuous, the precipitate-free zone becomes wider. Compared with 120℃/24h pre-aging,120℃/6h has advantage in terms of dissolution of finer precipitates and the growth of large coarse phase. Re-aging heat treatment can improve the strength and conductivity of over-aging alloys;compared with peak aging and retrogression and re-aging, the loss of tensile strength of the alloy is not significant, while the conductivity increases obviously. After over-aging and re-aging heat treatment, continuous anodic dissolution is avoided effectively, and the exfoliation corrosion resistance and stress corrosion cracking is enhanced.
Key words7056 aluminium alloy    multi-stage aging heat treatment    grain boundary precipitate    corro-sion resistance
收稿日期: 2017-08-23      出版日期: 2019-06-17
中图分类号:  TG146.2+1  
通讯作者: 陈康华(1962-),男,博士,教授,从事铝合金研究工作,联系地址:湖南省长沙市岳麓区麓山南路932号中南大学本部粉末冶金研究院(410083),E-mail:khchen@csu.edu.cn     E-mail: khchen@csu.edu.cn
引用本文:   
范淑敏, 陈送义, 张星临, 周亮, 黄兰萍, 陈康华. 多级时效热处理对7056铝合金析出组织与耐蚀性的影响[J]. 材料工程, 2019, 47(6): 136-143.
FAN Shu-min, CHEN Song-yi, ZHANG Xing-lin, ZHOU Liang, HUANG Lan-ping, CHEN Kang-hua. Influence of multi-stage aging heat treatment on precipitation microstructure and corrosion resistance of 7056 aluminum alloy. Journal of Materials Engineering, 2019, 47(6): 136-143.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2017.001061      或      http://jme.biam.ac.cn/CN/Y2019/V47/I6/136
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