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2024 | OriginalPaper | Chapter

Hot Deformation Behavior and Post-brazing Grain Structure of Dilute Al–(Sc–Zr) Alloys for Brazed Heat Exchangers

Authors : Alyaa Bakr, Paul Rometsch, X.-Grant Chen

Published in: Light Metals 2024

Publisher: Springer Nature Switzerland

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Abstract

An abnormally coarsened grain structure after brazing can negatively affect the in-service performance of a brazed heat exchanger. One of the numerous beneficial effects from the Sc addition to aluminum is its retardation effect on recrystallization and grain growth. In this work, dilute Al–0.07Sc and Al–0.07Sc–0.09Zr alloys were assessed with respect to the hot deformation and the post-brazing grain structure and compared with the base 1xxx alloy. The flow curves of the hot compression tests showed that the Al–Sc–Zr alloys exhibited higher flow stresses compared to the base alloy. The microstructure of the deformed samples in all three investigated alloys exhibited a recovered microstructure, but both Sc-containing alloys showed an improvement in the resistance to dynamic recovery. EBSD maps after a high temperature simulated brazing showed that the microstructure of the base alloy suffered from abnormal grain growth. Severe grain coarsening was still observed in the recrystallized microstructure of Al–0.07Sc alloy after brazing. The combined addition of Sc and Zr in Al–0.07Sc–0.09Zr alloy suppressed the abnormal grain growth, showing an improved control on the brazed microstructure. After post-braze aging at 350 °C for 4 h, the hardness of both Sc-containing alloys increased by 90–122% relative to the base alloy hardness.

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

next chapter Investigating the Influence of Iron Content on the Microstructure and Mechanical Properties of a High Strength Al-Alloy for Additive Manufacturing

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Title: Hot Deformation Behavior and Post-brazing Grain Structure of Dilute Al–(Sc–Zr) Alloys for Brazed Heat Exchangers
Authors: Alyaa Bakr
Paul Rometsch
X.-Grant Chen
Publisher: Springer Nature Switzerland
Book: Light Metals 2024
Print ISBN: 978-3-031-50307-8

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

Copyright Year: 2024
DOI: https://doi.org/10.1007/978-3-031-50308-5_143

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