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Deviations from Theoretical Orientation Relationship Along Tensile Twin Boundaries in Magnesium

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Magnesium Technology 2020

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

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Abstract

Deformation twinning is a prevalent mode of plastic deformation in hexagonal close packed (HCP) magnesium. Twin domains are associated with significant lattice reorientation and localized shear. The theoretical misorientation angle for the most common \( \left\{ {10\overline{1} 2} \right\}\) tensile twin in magnesium is 86.3°. Through electron backscatter diffraction characterization of twinning microstructure, we show that the twin boundary misorientation at the twin tips is approximately 85°, and it is close to the theoretical value only along the central part of the twin. The variations in twin/matrix misorientation along the twin boundary control the twin thickening process by affecting the nucleation, glide of twinning partials, and migration of twinning facets. To understand this observation, we employ a 3D crystal plasticity model with explicit twinning. The model successfully captures the experimentally observed misorientation variation, and it reveals that the twin boundary misorientation variations are governed by the local plasticity that accommodates the characteristic twin shear.

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Acknowledgements

This work is fully funded by the U.S. Department of Energy, Office of Basic Energy Sciences Project FWP 06SCPE401. I. J. B. acknowledges financial support from the National Science Foundation (NSF CMMI-1729887). B. L. acknowledges financial support from the National Defense Science and Engineering Graduate (NDSEG) Fellowship.

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Authors and Affiliations

  1. Materials Department, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA

    B. Leu & I. J. Beyerlein

  2. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 8745, USA

    M. Arul Kumar

  3. Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Y. Liu

  4. Mechanical Engineering Department, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA

    I. J. Beyerlein

Authors
  1. B. Leu
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  2. M. Arul Kumar
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  3. Y. Liu
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  4. I. J. Beyerlein
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Correspondence to B. Leu .

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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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© 2020 The Minerals, Metals & Materials Society

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Leu, B., Arul Kumar, M., Liu, Y., Beyerlein, I.J. (2020). Deviations from Theoretical Orientation Relationship Along Tensile Twin Boundaries in Magnesium. 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_20

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