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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 3/2013

01.03.2013 | Symposium: Environmental Damage in Structural Materials Under Static/Dynamic Loads at Ambient Temperature

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

verfasst von: Ramasis Goswami, Stanley Lynch, N. J. Henry Holroyd, Steven P. Knight, Ronald L. Holtz

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 3/2013

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Abstract

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 °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 η phase with stoichiometry Mg(Cu x Zn1−x )2. Considerable increase in Cu content in the grain boundary η 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.
Vorheriger Artikel Applied Stress Affecting the Environmentally Assisted Cracking
Nächster Artikel Transmission Electron Microscopic Investigations of Grain Boundary Beta Phase Precipitation in Al 5083 Aged at 373 K (100 °C)

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Metadaten
Titel
Evolution of Grain Boundary Precipitates in Al 7075 Upon Aging and Correlation with Stress Corrosion Cracking Behavior
verfasst von
Ramasis Goswami
Stanley Lynch
N. J. Henry Holroyd
Steven P. Knight
Ronald L. Holtz
Publikationsdatum
01.03.2013
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 3/2013
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-012-1413-0

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