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Deformation patterns and fracture stress of beta-phase gallium oxide single crystal obtained using compression of micro-pillars

  • Ceramics
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Abstract

The deformation of single-crystal beta-phase gallium oxide (or β-Ga2O3) micro-pillars under compression was investigated with the aid of transmission electron microscopy. High-density stacking faults were the dominant deformation defects in the plastically deformed micro-pillars. Micro-cracks were found along (200), (001) and (010) lattice planes and fracture occurred along (200) lattice plane when compressive strain was sufficiently great. Lattice bending was also observed in the fractured pillar. The average fracture stress and strain of β-Ga2O3 being measured are 7.25 ± 1.11 GPa and 3.80 ± 0.57%, respectively, which have never been reported previously.

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Acknowledgements

This work was financially supported by the Australia Research Council (ARC) under Discovery Project Scheme (DP180103275). SG was funded by the Youth Program of National Natural Science Foundation of China (51505063).

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Authors and Affiliations

  1. School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia

    Y. Q. Wu, S. Gao & H. Huang

  2. Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    S. Gao & R. K. Kang

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  1. Y. Q. Wu
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  2. S. Gao
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  3. R. K. Kang
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  4. H. Huang
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Correspondence to Y. Q. Wu or H. Huang.

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Wu, Y.Q., Gao, S., Kang, R.K. et al. Deformation patterns and fracture stress of beta-phase gallium oxide single crystal obtained using compression of micro-pillars. J Mater Sci 54, 1958–1966 (2019). https://doi.org/10.1007/s10853-018-2978-9

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  • DOI: https://doi.org/10.1007/s10853-018-2978-9

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