Evolution of Grain Boundary Precipitates in Al 7075 Upon Aging and Correlation with Stress Corrosion Cracking Behavior

被引：98

作者：

Goswami, Ramasis ^{[1
]}

Lynch, Stanley ^{[2
]}

Holroyd, N. J. Henry

Knight, Steven P. ^{[3
]}

Holtz, Ronald L. ^{[1
]}

机构：

[1] USN, Res Lab, Multifunct Mat Branch, Washington, DC 20375 USA

[2] Def Sci & Technol Org, Melbourne, Vic, Australia

[3] RMIT Univ, Melbourne, Vic, Australia

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2013年 / 44A卷 / 03期

关键词：

ZN-MG ALLOYS; ALUMINUM-ALLOY; CU ALLOYS; MECHANICAL-PROPERTIES; RETROGRESSION; MICROSTRUCTURES; CHEMISTRY; COPPER;

D O I：

10.1007/s11661-012-1413-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Transmission electron microscopy (TEM) was employed to investigate the microchemistry and microstructure of grain boundary precipitates in Al 7075 aged at room temperature for several hours, at 393 K (120 A degrees C) for 12 hours (under aged), at peak aged (T651) and over aged (T73) conditions. High resolution TEM analysis of precipitates at grain boundaries and fine probe energy dispersive spectrometry showed that the grain boundary precipitates at peak and over aged conditions are hexagonal eta phase with stoichiometry Mg(Cu (x) Zn1-x )(2). Considerable increase in Cu content in the grain boundary eta in the over aged condition compared to the peak aged condition was observed. The average Cu content in the over aged condition was found to be 20 at. pct. The higher Cu content of the precipitate is associated with a lower stress corrosion cracking plateau velocity.

引用

页码：1268 / 1278

页数：11

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