摘要
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.
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.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2008年第1期40-45,共6页
Transactions of Nonferrous Metals Society of China
基金
Project(G2003AA331100)supported by the National High-Tech Research Development Program of China
关键词
铝合金
显微结构
热处理
金属学
Al alloy
7B04 aluminum alloy microstructure
TEM
DSC
properties
