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Macroscopic Segregation and Stress Corrosion Cracking in 7xxx Series Aluminum Alloy Arc Welds

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Abstract

Arc welds of Al-Zn-Mg alloy with Al-Mg filler wire have shown a preferential macroscopic segregation of Mg and Zn to the weld toes. Islands of large precipitates, which are observed in those solute-enriched weld toes, are identified as T phase (Mg32(Al,Zn)49) using diffraction pattern analysis. The location of T precipitates consistently coincides with the initiation site for stress corrosion cracking. Therefore, it is hypothesized that they induce the crack initiation due to preferential dissolution.

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This research work is supported financially by Honda R&D Americas, Inc. (HRA) through Center for Integrative Materials Joining Science for Energy Applications (CIMJSEA), a National Science Foundation’s Industry & University Cooperative Research Center (NSF I/UCRC). The authors are grateful to Mr. Alan Seid and Patrick Shafer of HRA for conducting the stress corrosion testing and providing useful inputs. The authors are appreciative to Prof. S. Suresh Babu of University of Tennessee Knoxville and Prof. John Lippold of Ohio State University for valuable discussions and comments.

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Authors and Affiliations

  1. Ohio State University, Columbus, OH, USA

    Tyler E. Borchers (Ph.D. Candidate), Donald P. McAllister (Ph.D. Candidate) & Wei Zhang (Associate Professor)

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  1. Tyler E. Borchers
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  2. Donald P. McAllister
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  3. Wei Zhang
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Correspondence to Wei Zhang.

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Manuscript submitted August 31, 2014.

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Borchers, T.E., McAllister, D.P. & Zhang, W. Macroscopic Segregation and Stress Corrosion Cracking in 7xxx Series Aluminum Alloy Arc Welds. Metall Mater Trans A 46, 1827–1833 (2015). https://doi.org/10.1007/s11661-015-2796-5

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