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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 6/2018

12-04-2018

Mitigating Intergranular Stress Corrosion Cracking in Age-Hardenable Al-Zn-Mg-Cu Alloys

Authors: M. Ajay Krishnan, V. S. Raja, Shweta Shukla, S. M. Vaidya

Published in: Metallurgical and Materials Transactions A | Issue 6/2018

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Abstract

This article reports an attempt to develop high-strength aluminum alloys of 7xxx series resistant to intergranular stress corrosion cracking (SCC). A novel aging technique reported in this work exhibited improved strength levels (as high as ~ 100 MPa to that of conventional overaged temper for AA 7050) with significant resistance to SCC measured even at a low strain rate (10−7 s−1) in 3.5 wt pct NaCl. The novel aging heat treatment produced a microstructure that is finer and dense enough in the matrix to impart strength, whereas it is enriched with Cu on the grain boundaries to impart SCC resistance. A detailed explanation for the enhanced strength and SCC resistance is discussed.
previous article Impact of Annealing Prior to Solution Treatment on Aging Precipitates and Intergranular Corrosion Behavior of Al-Cu-Li Alloy 2050
next article Deformation Mechanism and Recrystallization Relationships in Galfenol Single Crystals: On the Origin of Goss and Cube Orientations

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Metadata
Title
Mitigating Intergranular Stress Corrosion Cracking in Age-Hardenable Al-Zn-Mg-Cu Alloys
Authors
M. Ajay Krishnan
V. S. Raja
Shweta Shukla
S. M. Vaidya
Publication date
12-04-2018
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 6/2018
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-018-4601-8

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