您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 1    January 2008

[PDF Download]    

    

Microstructural evolution of aluminum alloy 7B04 thick plate by various thermal treatments
LI Zhi-hui(李志辉), XIONG Bai-qing(熊柏青), ZHANG Yong-an(张永安),ZHU Bao-hong(朱宝宏), WANG Feng(王 锋), LIU Hong-wei(刘红伟)

State Key Laboratory for Fabrication and Processing of Non-ferrous Metals,General Research Institute for Non-ferrous Metals, Beijing 100088, China

Abstract:The microstructure of an AA 7B04 alloy in the form of plate was investigated using differential scanning calorimetry (DSC) and TEM analysis technologies. Tensile properties and electrical conductivity of AA 7B04 under various heat treatment conditions were also presented. The results reveal that peak-aged microstructure contains GP zones and η′ precipitates predominantly. After retrogressing and reaging(RRA), the η′ and η precipitates disperse in the alloy matrix, and the η precipitates distribute coarsely and sparsely, decorating the grain boundaries, together with precipitate free zones(PFZs) around them. It is also shown that selecting of suitable heat treatments can provide optimal precipitates in matrix and at grain boundaries, which gives rise to a combination of high strength and stress corrosion cracking(SCC) resistance in such materials.

 

Key words: Al alloy; 7B04 aluminum alloy microstructure; TEM; DSC; properties

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn