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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 13/2012

01-12-2012

Evaluation of Al3Mg2 Precipitates and Mn-Rich Phase in Aluminum-Magnesium Alloy Based on Scanning Transmission Electron Microscopy Imaging

Authors: Yakun Zhu, David A. Cullen, Soumya Kar, Michael L. Free, Lawrence F. Allard

Published in: Metallurgical and Materials Transactions A | Issue 13/2012

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Abstract

Scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectroscopy (EDS) were used to observe intergranular and intragranular β-phase (Al3Mg2) formation and growth in as-received sample and long-term (~1 year) thermally treated samples of 5083-H131 alloy. Rod-shaped and equiaxed particles rich in Mn, Fe, and Cr were present in the as-received and heat treated samples. The β-phase precipitated along grain boundaries as well as around and between preexisting Mn-Fe-Cr rich particles. The measured thickness of β-phase along grain boundaries was lower than Zener–Hillert diffusion model predicted value and the potential reasons were theoretically analyzed. Dislocation networks, grain boundaries, and different preexisting particles were observed to contribute to Mg diffusion and β-phase precipitation.
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Metadata
Title
Evaluation of Al3Mg2 Precipitates and Mn-Rich Phase in Aluminum-Magnesium Alloy Based on Scanning Transmission Electron Microscopy Imaging
Authors
Yakun Zhu
David A. Cullen
Soumya Kar
Michael L. Free
Lawrence F. Allard
Publication date
01-12-2012
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 13/2012
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-012-1354-7

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