Isometric Tilt Grain Boundaries and Solute Segregation in a Deformed Mg–Zn–Ca Alloy

  • Y. M. ZhuEmail author
  • J. F. Nie
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Solute segregation to grain boundaries is an essential phenomenon that affects multiple mechanical properties of magnesium alloys. In this work, the deformed microstructure in a Mg–Zn–Ca alloy that was compressed at room temperature has been examined by bright-field and high-angle annular dark-field scanning transmission electron microscopy. Domains made of nanograins have been observed in some local areas. These domains exhibit strong texture and most of the nanograins oriented with their \( \left\langle {11\bar{2}0} \right\rangle_{\alpha } \) being paralleled to each other, which is similar to those reported in the Mg–Gd alloy. The grain boundaries of these nanograins involve many isometric tilt boundaries containing twin boundaries. Segregation of Zn/Ca atoms occurs in these tilt boundaries in the cold deformed sample. The segregation forms unique and chemically ordered patterns specific to tilt boundaries.


Mg alloys Tilt boundary Solute segregation HAADF-STEM 



The authors wish to acknowledge gratefully the financial support from the Australian Research Council and the access to the facilities of the Monash Centre for Electron Microscopy.


  1. 1.
    Sutton, AP, Balluffi, RW (1995) Interfaces in crystalline materials. Oxford Scientific Publications, Oxford.Google Scholar
  2. 2.
    Cantwell PR, Tang M, Dillon SJ, Luo J, Rohrer GS, Harmer MP (2014) Grain boundary complexions, Acta Mater. 62:1–48.CrossRefGoogle Scholar
  3. 3.
    Wang J, Beyerlein IJ (2012) Atomic structures of symmetric tilt grain boundaries in hexagonal close packed (hcp) crystals. Model. Simul. Mater. Sci. Eng. 20:024002.CrossRefGoogle Scholar
  4. 4.
    Wang J, Beyerlein IJ (2012) Atomic structures of [0\( \bar{1} \)10] symmetric tilt grain boundaries in hexagonal close-packed (hcp) crystals, Metall. Mater. Trans. A 43:3556–69.Google Scholar
  5. 5.
    Huber L, Rottler J, Militzer M (2014) Atomistic simulations of the interaction of alloying elements with grain boundaries in Mg, Acta Mater. 80:194–204.CrossRefGoogle Scholar
  6. 6.
    Nie JF, Zhu YM, Liu ZJ, Fang XY (2013) Periodic segregation of solute atoms in fully coherent twin boundaries, Science 340:957–960.CrossRefGoogle Scholar
  7. 7.
    Ghazisaeidi M, Hector Jr. LG, Curtin WA (2014) Solute strengthening of twinning dislocations in Mg alloys, Acta Mater. 80:278–287.CrossRefGoogle Scholar
  8. 8.
    Zhu YM, Bian MZ, Nie JF (2017) Tilt boundaries and associated solute segregation in a Mg–Gd alloy, Acta Mater 127:505–518.CrossRefGoogle Scholar
  9. 9.
    Pennycook SJ, Jesson DE (1992) Atomic resolution Z-contrast imaging of interfaces. Acta Metall. Mater. 40:S149.CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringMonash UniversityMelbourneAustralia

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