Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第9期    总第210期    2016年9月

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文章编号:1004-0609(2016)-09-1850-08
新型7056铝合金双级时效的显微组织和性能
刘俊涛1, 2,张永安1,李锡武1,李志辉1,熊柏青1,张济山2

(1. 北京有色金属研究总院 有色金属材料制备加工国家重点实验室,北京100088;
2. 北京科技大学 新金属材料国家重点实验室,北京 100083
)

摘 要: 采用力学性能和电导率测试以及透射电子显微镜组织等观察分析新型7056铝合金双级时效制度下的性能和显微组织。结果表明:第二级时效处理后,合金基体沉淀析出相长大粗化,晶界析出相逐渐呈断续分布状态,无析出带随时间的延长而变宽;经第二级150 ℃、12 h时效后,合金由GP区和η相构成,析出相的尺寸为7~9 nm,并出现明显的无析出带;随着第二级时效时间的延长,合金电导率逐渐升高,屈服强度先增大后减小;合金经 (110 ℃、6 h)+(150 ℃、14 h)双级时效处理后,屈服强度达到650 MPa,电导率为21.72 MS/m,表现出优异的综合性能。

 

关键字: 7056铝合金;双级时效;显微组织;性能

Microstructure and properties of two-step aged novel 7056 aluminum alloy
LIU Jun-tao1, 2, ZHANG Yong-an1, LI Xi-wu1, LI Zhi-hui1, XIONG Bai-qing1, ZHANG Ji-shan2

1. State Key Laboratory for Fabrication and Processes of Nonferrous Metals,
General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. State Key Laboratory for Advanced Metals and Materials,
University of Science and Technology, Beijing 100083, China

Abstract:The properties and microstructure of two-step aged Al-9.73Zn-1.98Mg-1.76Cu aluminum alloy were studied by using of measuring properties and electrical conductivity and TEM analysis. The results show that matrix precipitates growth and coarsening, grain boundary phases distribute discontinuous, and precipitation free zone (PFZ) become broader with increasing the second ageing time. The second (150 ℃, 12 h) aged alloy consists of GP zone and η′ phase, the size of precipitates is between 7-9 nm, and PFZ can be found apparently. The electrical conductivity increases with increasing the second step ageing time, while yield strength increases firstly, and then reduces. Alloy aged at (110 ℃, 6 h)+(150 ℃, 14 h) can obtain the yield strength of 650 MPa, and electrical conductivity of 21.72 MS/m, which shows good performance matching.

 

Key words: 7056 aluminum alloy; two-step ageing; microstructure; property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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