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Published in: Physics of Metals and Metallography 14/2021

18-08-2021 | STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION

Effect of Minor Sc and Zr Addition on the Microstructure of 7075 Aluminum Alloy during Homogenization Treatment Process

Authors: Jinfeng Leng, Binghui Ren, Hao Wu, Ran Wang, Yunfan Dong

Published in: Physics of Metals and Metallography | Issue 14/2021

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Abstract

The effect mechanisms of Sc and Zr addition on the microstructure of 7075 aluminum alloys in the homogenization process were elucidated. The addition of Sc and Zr remarkably refined the grain size of as-cast 7075 aluminum alloy and the size of the coarse nonequilibrium eutectic phase on the grain boundaries. It led to a relatively small nonequilibrium eutectic phase at the grain boundary of Sc–Zr–7075 alloy that was fully dissolved and the long strip evolved into a sphere shape in the homogenization process. The precipitation behavior of the Al3(Sc,Zr) (size, volume fraction) phase is different in different homogenization processes. The fine and dispersed Al3(Sc,Zr) phase significantly improved the resistance of recrystallization in 7075 aluminum alloy in the subsequent thermal deformation and heat treatment process. The Al3(Sc,Zr) phase was finer and more dispersed in the two-stage homogenization process (400°C/12 h + 465°C/12 h) as compared to the single-stage homogenization process (465°C/16 h).
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Metadata
Title
Effect of Minor Sc and Zr Addition on the Microstructure of 7075 Aluminum Alloy during Homogenization Treatment Process
Authors
Jinfeng Leng
Binghui Ren
Hao Wu
Ran Wang
Yunfan Dong
Publication date
18-08-2021
Publisher
Pleiades Publishing
Published in
Physics of Metals and Metallography / Issue 14/2021
Print ISSN: 0031-918X
Electronic ISSN: 1555-6190
DOI
https://doi.org/10.1134/S0031918X2114012X