摘要
为了平衡合金的强度、塑性与耐蚀性,在不同回归温度和时间条件下对深冷变形7A85铝合金的显微组织和综合性能进行研究。结果表明,在较低回归温度和时间的回归再时效(RRA)制度和T6(120℃,24h)制度下,合金具有较高的强度,但耐蚀性较差。对于RRA,在一定范围内增加回归温度和时间会降低合金的强度,但合金的电导率和耐蚀性显著提高。然而,过度地增加回归温度和时间使合金的耐蚀性降低。相同的回归温度下,随着回归时间的延长,合金的伸长率先减小后增大。与三向深冷变形7A85铝合金的最佳匹配的制度为RRA180-0.5((120℃,24 h)+(180℃,0.5 h)+(120℃,24 h))。
To balance the strength,plasticity,and corrosion resistance of the alloy,the microstructure and comprehensive properties of cryogenically-deformed 7A85 aluminum alloy at various retrogression temperatures and time were investigated.The results showed that under the retrogression and re-aging(RRA)of lower retrogression temperature and time and T6(120℃,24 h)tempers,the alloy had higher strength but poorer corrosion resistance.For RRA,increasing the retrogression temperature and time within a certain range reduced the strength but significantly improved the electrical conductivity and corrosion resistance of the alloy.However,excessively increasing the retrogression temperature and time led to a reduction in corrosion resistance.At the same retrogression temperature,the elongation of the alloy first decreased and then increased with the extension of retrogression time.The optimal temper matched to the three-dimensional cryogenically deformed 7A85 aluminum alloy was RRA180-0.5((120℃,24 h)+(180℃,0.5 h)+(120℃,24 h)).
作者
王当
张文学
易幼平
黄始全
何海林
张京京
Dang WANG;Wen-xue ZHANG;You-ping YI;Shi-quan HUANG;Hai-lin HE;Jing-jing ZHANG(Research Institute of Light Alloy,Central South University,Changsha 410083,China;State Key Laboratory of High Performance Complex Manufacturing,Changsha 410083,China;Capital Aerospace Machinery Corporation Limited,Beijing 100076,China;School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China)
基金
supported by the National Natural Science Foundation of China(No.51875583)
the General Program of Natural Science Foundation of Hunan Province,China(No.2020JJ4709)。
关键词
深冷变形7A85铝合金
回归温度
回归时间
强度
耐蚀性
最佳制度
cryogenically-deformed 7A85 aluminum alloy
retrogression temperature
retrogression time
strength
corrosion
作者简介
Corresponding author:张文学,Tel:+86-18610630540,Fax:+86-731-88830294,E-mail:titanszhang@126.com;Corresponding author:易幼平,Tel:+86-18874869619,Fax:+86-731-88830294,E-mail:yyp@csu.edu.cn。
