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Magnesium Technology 2020 pp 167–173Cite as

Effect of Second Phase Particle Size on the Recrystallized Microstructure of Mg–Al Alloys Following ECAE Processing

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Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

Magnesium (Mg) alloys are excellent candidates for structural applications, given their high strength to weight ratios. Grain boundaries and precipitates can both contribute to strengthening in Mg alloys , but the design of high strength Mg alloys is challenging due to Mg’s anisotropic crystal lattice and yield asymmetry. Herein, we focus on thermomechanical processing that involves grain refinement in the presence of precipitates. We seek an understanding of how small and large Mg17Al12 intermetallic particles impact recrystallization and discontinuous precipitation in Mg–Al alloys. We do so by processing solution treated and peak aged Mg–9Al (wt%) alloys using equal channel angular extrusion (ECAE) along the Bc route at 150 °C. We find that the fine nanoprecipitates that nucleate within the solutionized grain interiors during ECAE processing lead to finer Mg grains in the recrystallized regions compared to those in the presence of the long lathlike precipitates produced during peak aging prior to ECAE processing.

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Acknowledgements

The authors would like to gratefully acknowledge the financial and technical support from the Center for Materials under Extreme Dynamic Environment (CMEDE). The research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-12-2-0022. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the US Government. The US Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA

    Suhas Eswarappa Prameela, Peng Yi, Vance Liu, Beatriz Medeiros, Michael L. Falk & Timothy P. Weihs

  2. Hopkins Extreme Materials Institute, Johns Hopkins University, Baltimore, MD, 21218, USA

    Suhas Eswarappa Prameela, Peng Yi, Laszlo J. Kecskes, Michael L. Falk & Timothy P. Weihs

  3. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA

    Michael L. Falk

  4. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, 21218, USA

    Michael L. Falk

Authors
  1. Suhas Eswarappa Prameela
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  2. Peng Yi
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  3. Vance Liu
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  4. Beatriz Medeiros
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  5. Laszlo J. Kecskes
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  6. Michael L. Falk
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  7. Timothy P. Weihs
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Correspondence to Suhas Eswarappa Prameela .

Editor information

Editors and Affiliations

  1. Tuscaloosa, AL, USA

    J. Brian Jordon

  2. University of Florida, Gainesville, FL, USA

    Victoria Miller

  3. Pacific Northwest National Laboratory, Richland, WA, USA

    Vineet V. Joshi

  4. IND LLC, South Jordan, UT, USA

    Neale R. Neelameggham

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Eswarappa Prameela, S. et al. (2020). Effect of Second Phase Particle Size on the Recrystallized Microstructure of Mg–Al Alloys Following ECAE Processing. In: Jordon, J., Miller, V., Joshi, V., Neelameggham, N. (eds) Magnesium Technology 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36647-6_27

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