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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)

Abstract

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.

Keywords

Mg alloys Tilt boundary Solute segregation HAADF-STEM 

Notes

Acknowledgements

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.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringMonash UniversityMelbourneAustralia

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