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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium 2026 Technical Division Student Poster Contest
Presentation Title SPG-72: An In-Situ Straining TEM Analysis of Crack Propagation and Shear Band Evolution in Al–Tb Marginal Metallic Glass
Author(s) Elif Acun, Fan Sun, İlkay Kalay, Marie-Hélène Berger, Yunus Eren Kalay
On-Site Speaker (Planned) Elif Acun
Abstract Scope Marginal Al–rare earth (Al–RE) metallic glasses exhibit pronounced mechanical heterogeneity due to the presence of medium-range order (MRO). The as-spun structure and spatial distribution of MRO are being characterized using four-dimensional scanning transmission electron microscopy (4D-STEM) to establish a structural baseline. Yet the dynamic interaction between shear bands and crack propagation remains insufficiently understood. In this study, the real-time evolution of shear band activity during crack initiation and growth is investigated using in-situ tensile straining inside a transmission electron microscope. The observations reveal highly localized deformation zones ahead of advancing cracks, accompanied by nanoscale structural rearrangements within shear bands. Interactions between propagating cracks and pre-existing heterogeneities lead to deviations in crack paths, including local blunting and branching. These effects indicate a strain-rate and path-dependent response governed by spatial variations in shear resistance. The results emphasize the role of dynamic shear band evolution in regulating fracture processes in marginal metallic glasses.
Proceedings Inclusion? Undecided
Keywords Characterization, Mechanical Properties, Other

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