Atom probe tomography of intermetallic phases and interfaces formed in dissimilar joining between Al alloys and steel

Journal Article · Sat Oct 15 04:00:00 EDT 2016 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2016.09.008· OSTI ID:22689638

Lemmens, B. ^[1]; Duarte, M. J. ^[2]; De Graeve, I. ^[1]; De Strycker, J. ^[3]; Raabe, D. ^[2]; Verbeken, K. ^[1]

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1. Department of Materials Science and Engineering, Ghent University (UGent), Technologiepark 903, B-9052 Zwijnaarde (Belgium)
2. Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düsseldorf (Germany)
3. ArcelorMittal Global R&D Gent, J.F. Kennedylaan 3, B-9060 Zelzate (Belgium)

While Si additions to Al are widely used to reduce the thickness of the brittle intermetallic seam formed at the interface during joining of Al alloys to steel, the underlying mechanisms are not clarified yet. The developed approach for the site specific atom probe tomography analysis revealed Si enrichments at grain and phase boundaries between the θ (Fe{sub 4}Al{sub 13}) and η (Fe{sub 2}Al{sub 5}) phase, up to about ten times that of the concentration in Al. The increase in Si concentration could play an important role for the growth kinetics of the intermetallic phases formed for example in hot-dip aluminizing of steel. - Highlights: •Si additions to Al reduce thickness of intermetallic seam in joining with steel. •Approach developed for the site specific APT analysis of the intermetallic seam •Si enrichment at grain and phase boundaries possibly affects growth of intermetallics.

• OSTI ID: 22689638
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 120; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
ALUMINIUM ALLOYS
CONCENTRATION RATIO
ENRICHMENT
INTERFACES
INTERMETALLIC COMPOUNDS
PROBES
SILICON ADDITIONS
STEELS
THICKNESS
TOMOGRAPHY
WELDING