Revealing local atomic re-arrangements in the shear-bands of deformed metallic glasses using scanning electron nano-diffraction

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Revealing local atomic re-arrangements in the shear-bands of deformed metallic glasses using scanning electron nano-diffraction

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Author(s): Huyen T. Pham ¹ ^, , Daniel East ² , Timothy C. Petersen ¹ ^, ³ , Amelia C. Y. Liu ¹ ^, ³ ^,

Publication date (Electronic): 21 January 2025

Conference name: 13th Asia Pacific Microscopy Congress 2025 (APMC13)

Conference date: 2-7 Febuary 2025

Keywords: metallic glass, shear band, scanning electron nano-diffraction, local atomic arrangements, strain

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Abstract

Metallic glasses are amorphous metal alloys with a highly disordered structure. Metallic glasses exhibit exceptionally high strength, surpassing most engineering materials, along with low stiffness and high elastic strain limits. Understanding local atomic arrangements and structural symmetry is crucial for improving the mechanical properties of metallic glasses [ 1]. However, the local atomic re-arrangements that govern deformation by shear banding remain unclear, even though this is essential to mitigating brittleness and failure in metallic glasses. Local structural symmetry and anisotropy in glasses can be accessed in diffraction experiments where the scattering volume is small by employing a beam tailored to the diameter of a nearest-neighbour polyhedron and well-controlled specimen thickness (10-20 polyhedra) [ 2, 3, 4]. Here we report on the atomic-scale structure within a shear band in a metallic glass by employing scanning electron nano-diffraction on a carefully prepared specimen in which the subtle structural changes that occur from deformation in an amorphous material have been preserved.

We prepared an inverted transmission electron microscope (TEM) lamella at the cross-sectional surface of a shear band formed by bending and thus tension at the surface of the metallic glass ribbon. We cut the lamella out using focused ion beam (Thermo Fisher Helios 5 UX) and thinned it with argon ion polishing at -150 ^oC (Gatan PIPS II). The inverted ion beam thinning and low temperature preserved the atomic structure underneath the shear step while producing a specimen that had a thickness of approx. 30 nm. Figure 1A shows a scanning electron microscope (SEM) image highlighting the shear step on the surface of a deformed metallic glass with the black carbon layer indicating the location of the inverted TEM lamella.

Fig. 1

Local structure of deformed Zr ₃₆Cu ₆₄ metallic glass . (A) SEM image showing the shear step from a shear band on a deformed metallic glass. The black carbon layer shows the location of the inverted TEM lamella. (B) STEM-HAADF image of the inverted TEM lamella; the yellow square indicates the location of the shear band based on two fiducial markers placed on both sides of the shear step. (C) A higher magnification STEM-HAADF image of the shear band, showing the area where scanning electron nano-diffraction maps were acquired (pink square). (D) Strain maps showing the in-plane components of the local strain ε _xx , ε _xy , and ε _yy collected in the area indicated by the pink square (S).

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Publication date (Electronic): 21 January 2025

Electronic Location Identifier: e206

Affiliations

[1 ]School of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia

[2 ]Advanced Manufacturing and Metals, CSIRO, Research Way, Clayton, Victoria, 3168, Australia

[3 ]Monash Centre for Electron Microscopy, Monash University, Clayton, Victoria, 3800, Australia

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*Corresponding authors: huyen.pham@ 123456monash.edu , amelia.liu@ 123456monash.edu

Article

DOI: 10.14293/APMC13-2025-0206

SO-VID: 143a8397-ce19-4a19-b80c-bfe73dd2d13f

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Published under Creative Commons Attribution 4.0 International ( CC BY 4.0). Users are allowed to share (copy and redistribute the material in any medium or format) and adapt (remix, transform, and build upon the material for any purpose, even commercially), as long as the authors and the publisher are explicitly identified and properly acknowledged as the original source.

Conference name: 13th Asia Pacific Microscopy Congress 2025

Conference acronym: APMC13

Conference number: 13

Conference location: Brisbane, Australia

Conference date: 2-7 Febuary 2025

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Funding

Funded by: Australian Research Council (ARC)

Award ID: LE0454166

Funded by: Australian Research Council (ARC)

Award ID: FT180100594

Funded by: Australian Research Council (ARC)

Award ID: LE200100132

The authors acknowledge the use of the instruments at the Monash Centre for Electron Microscopy, a Node of Microscopy Australia. This research was supported by Australian Research Council (ARC) grants (LE0454166, FT180100594, LE200100132).

References

E. D. Bøjesen, et al., J. Phys: Mater. 3, (2020) 044002, https://iopscience.iop.org/article/10.1088/2515-7639/aba820/meta.
A. C. Y. Liu, et al., Proc. Natl. Acad. Sci. 114, (2017) 10344–9. https://doi.org/10.1073/pnas.1707198114.
A. C. Y. Liu, et al., Phys. Rev. Lett. 116, (2016) 205501, https://doi.org/10.1103/PhysRevLett.116.205501
A. C. Y. Liu, et al., Sci. Adv. 8, (2022) eabn0681, https://www.science.org/doi/10.1126/sciadv.abn0681.
A. C. Y. Liu, H. Pham, et al., arXiv preprint, (2024), arXiv:2410.09391 [cond-mat.soft], https://doi.org/10.48550/arXiv.2410.09391

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[1] E. D. Bøjesen, et al., J. Phys: Mater. 3, (2020) 044002, https://iopscience.iop.org/article/10.1088/2515-7639/aba820/meta.

[2] A. C. Y. Liu, et al., Proc. Natl. Acad. Sci. 114, (2017) 10344–9. https://doi.org/10.1073/pnas.1707198114.

[3] A. C. Y. Liu, et al., Phys. Rev. Lett. 116, (2016) 205501, https://doi.org/10.1103/PhysRevLett.116.205501

[4] A. C. Y. Liu, et al., Sci. Adv. 8, (2022) eabn0681, https://www.science.org/doi/10.1126/sciadv.abn0681.

[5] A. C. Y. Liu, H. Pham, et al., arXiv preprint, (2024), arXiv:2410.09391 [cond-mat.soft], https://doi.org/10.48550/arXiv.2410.09391

Revealing local atomic re-arrangements in the shear-bands of deformed metallic glasses using scanning electron nano-diffraction

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