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On the Microstructural Aspects of Shock Induced Failure in Magnesium Alloys

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Dynamic Behavior of Materials, Volume 1

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Abstract

The microstructural aspects of shock induced plasticity and consequent failure in metals were studied using AZ31B and AMX602 magnesium alloys which were mechanically processed via Equal Channel Angular Extrusion (ECAE) and Spinning Water Atomization Process (SWAP) respectively. Results show that microstructure and microstructure evolution can strongly influence the mechanical response and consequent failure of these materials. Failure in both ECAE processed AZ31B-4E and AZ31B-4B/C magnesium alloy was dominated by debonding of the matrix magnesium from large Al-Mn-rich intermetallic inclusions and/or cracking of inclusions after the passage of shock stresses ranging from 1.5 to 4.5 GPa. However, the failure characteristic in the SWAP AMX602 magnesium alloy was distinctly different from that of the AZ31B magnesium alloy for the similar shock stress range. Numerous isolated cracks were observed around the spall plane possibly emanating from nucleation sites other than the Al2Ca intermetallic inclusions in AMX602. The spall surfaces of the AMX602 samples were striated possibly due to corrosion of the SWAP powder prior to green-compaction. Mixed-mode failure was observed in all three materials possibly due to homogeneous and heterogeneous nucleation, growth, and coalescence of nanovoids and microvoids respectively.

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Acknowledgements

The authors gratefully acknowledge Mr. Jermaine Bradley and Mr. Micah Gallagher for their valuable support in sample fabrication and recovery experiments. Thanks to Dr. Laszlo Kecskes and Mr. Tyrone Jones for providing the AZ31B and AMX602 plates from which plate impact samples were fabricated.

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Authors and Affiliations

  1. Army Research Laboratory, Aberdeen Proving Ground, MD, 21005, USA

    C. L. Williams & J. Ligda

  2. Institute of Shock Physics, Imperial College London, London, SW7 2AZ, UK

    L. Farbaniec

  3. The Johns Hopkins University, Baltimore, MD, 21218, USA

    N. Krywopusk

Authors
  1. C. L. Williams
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  2. J. Ligda
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  3. L. Farbaniec
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  4. N. Krywopusk
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Corresponding author

Correspondence to C. L. Williams .

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Editors and Affiliations

  1. New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA

    Jamie Kimberley

  2. Drexel University, Philadelphia, Pennsylvania, USA

    Leslie Lamberson

  3. National Institute of Standards and Technology, Gaithersburg, Maryland, USA

    Steven Mates

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Williams, C.L., Ligda, J., Farbaniec, L., Krywopusk, N. (2018). On the Microstructural Aspects of Shock Induced Failure in Magnesium Alloys. In: Kimberley, J., Lamberson, L., Mates, S. (eds) Dynamic Behavior of Materials, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-62956-8_20

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  • DOI: https://doi.org/10.1007/978-3-319-62956-8_20

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-62955-1

  • Online ISBN: 978-3-319-62956-8

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