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

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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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Acknowledgments

Microscopy research at the Oak Ridge National Laboratory’s High Temperature Materials Laboratory was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program. Thanks to the Office of Naval Research for providing funding under Award No. N000141010347. We are thankful to the reviewers for providing valuable comments and suggestions.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, University of Utah, Salt Lake City, UT, USA

    Yakun Zhu (Master candidate), Soumya Kar (Researcher) & Michael L. Free (Professor)

  2. Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

    David A. Cullen (Scientist) & Lawrence F. Allard (Scientist)

Authors
  1. Yakun Zhu
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  2. David A. Cullen
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  3. Soumya Kar
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  4. Michael L. Free
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  5. Lawrence F. Allard
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Correspondence to Yakun Zhu.

Additional information

Manuscript submitted January 14, 2012.

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Zhu, Y., Cullen, D.A., Kar, S. et al. Evaluation of Al3Mg2 Precipitates and Mn-Rich Phase in Aluminum-Magnesium Alloy Based on Scanning Transmission Electron Microscopy Imaging. Metall Mater Trans A 43, 4933–4939 (2012). https://doi.org/10.1007/s11661-012-1354-7

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  • DOI: https://doi.org/10.1007/s11661-012-1354-7

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