Atomic-scale three-dimensional structural characterisation of twin interface in Mg alloys

ABSTRACT

Twinning plays important role in plastic deformation of Mg alloys. However, it is difficult to obtain full information on twinning structures through transmission electron microscope observations. Here, we developed a new method to reconstruct the three-dimensional structure of a twin boundary. The {10$\overline{1}$2} twin was observed from three directions, i.e. the [11$\overline{2}$0], [20$\overline{2}$1], and [4$\overline{2}\overline{2}$3] zone axes, in order to establish the atomic model of the boundary. Additionally, we propose that the observed directions for {10$\overline{1}$1} and {10$\overline{1}$3} twins should be [11$\overline{2}$3] & [10$\overline{1}$1] and [2$\overline{1}\overline{1}$1] & [5$\overline{1}\overline{4}$3], respectively.

KEYWORDS:

• Mg alloys
• twinning
• transmission electron microscope
• three-dimensional structure of twin boundary

Acknowledgements

The authors wish to express their appreciation to the Jiangsu Key Laboratory of Advanced Micro&Nano Materials and Technology. The TEM experiments were performed at the Materials Characterisation and Research Center of Nanjing University .f Science and Technology.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work is supported by the National Key Research and Development Program of China (grant number 2017YFA0204403), the National Natural Science Foundation of China (grant numbers 51931003, 51901103, 51601003 and 51401172), the China Postdoctoral Science Foundation (grant number 2019M661844), the Fundamental Research Funds for the Central Universities (grant number 30918011342), the Natural Science Foundation of Heilongjiang Province of China (grant number QC2017061), the HarBin Science and Technology Bureau (grant number 2017RAQXJ066), and the Research and development project of scientific and technological achievements in provincial universities of Heilongjiang Provincial Department of Education (grant number TSTAU-R2018003).