Effect of Sc and Zr Microalloying on Grain Structure After Hot Deformation and Brazing in Al–Mn 3xxx Alloys | springerprofessional.de

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2024 | OriginalPaper | Buchkapitel

Effect of Sc and Zr Microalloying on Grain Structure After Hot Deformation and Brazing in Al–Mn 3xxx Alloys

verfasst von : Alyaa Bakr, Paul Rometsch, X.-Grant Chen

Erschienen in: Light Metals 2024

Verlag: Springer Nature Switzerland

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Abstract

Al–Mn 3xxx alloys are widely used in the fabrication of multi-port extruded (MPE) tubes for aluminum heat exchangers. The industrial manufacture for those tubes consists of four steps: (1) homogenization, (2) extrusion, (3) straightening/sizing, and (4) brazing. The combination of cold work and brazing could result in abnormally coarsened grains that have negative impacts on the in-service performance of MPE tubes. A 3xxx alloy microalloyed with 0.08 wt.% Sc and 0.09 wt.% Zr was assessed with respect to the grain structures after hot deformation and brazing, and a comparison was made with the base 3xxx alloy free of Sc and Zr. The flow stress of the base alloy during hot compression at 500 °C and 1 s⁻¹ was 48 MPa, while the alloy with added Sc and Zr showed a higher flow stress of 61.5 MPa. EBSD maps after hot deformation showed that the alloy with added Sc and Zr exhibited more resistance to dynamic recovery and dynamic recrystallization. After the high-temperature simulated brazing at 605 °C, the base alloy suffered from abnormal grain growth, whereas the alloy with added Sc and Zr exhibited an elongated recrystallized microstructure with a finer grain size.

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Titel: Effect of Sc and Zr Microalloying on Grain Structure After Hot Deformation and Brazing in Al–Mn 3xxx Alloys
verfasst von: Alyaa Bakr
Paul Rometsch
X.-Grant Chen
Copyright-Jahr: 2024
Verlag: Springer Nature Switzerland
Buch: Light Metals 2024
Print ISBN: 978-3-031-50307-8

Electronic ISBN: 978-3-031-50308-5

Copyright-Jahr: 2024
DOI: https://doi.org/10.1007/978-3-031-50308-5_142

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