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Characterization of Staggered Twin Formation in HCP Magnesium

  • M. Arul KumarEmail author
  • B. Leu
  • P. Rottmann
  • I. J. Beyerlein
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Twins in hexagonal close-packed polycrystals, most often nucleate at grain-boundaries (GBs), propagate into the grain and terminate at opposing GBs. Regularly, multiple parallel twins of the same variant form inside the same grain. When twins terminate inside the grains, rather than the grain boundary, they tend to form a staggered structure. Whether a staggered twin structure or the more common grain spanning twin structure forms can greatly affect mechanical behavior. In this work, the underlying mechanism for the formation of staggered twins is studied using an elasto-visco-plastic fast Fourier transform model, which quantifies the local stresses associated with \( \left\{ {10\overline{1} 2} \right\} \)-type staggered twins in magnesium for different configurations. The model results suggest that when a twin tip is close to the lateral side of another twin, the driving force for twin propagation is significantly reduced. As a result, the staggered twin structure forms.

Keywords

Deformation twins Staggered structure Local stresses Crystal plasticity Magnesium 

Notes

Acknowledgements

This work is fully funded by the US 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). BL acknowledges financial support from the National Defense Science and Engineering Graduate (NDSEG) Fellowship. The authors thank Luoning Ma (Johns Hopkins University) for the preparation of TEM specimen.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • M. Arul Kumar
    • 1
    Email author
  • B. Leu
    • 2
  • P. Rottmann
    • 2
  • I. J. Beyerlein
    • 2
    • 3
  1. 1.Los Alamos National LaboratoryMaterials Science and Technology DivisionLos AlamosUSA
  2. 2.Materials DepartmentUniversity of California at Santa BarbaraSanta BarbaraUSA
  3. 3.Mechanical Engineering DepartmentUniversity of California at Santa BarbaraSanta BarbaraUSA

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