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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Structure-Property Relationships of Bulk Metallic Glasses
Presentation Title Bridging Necking and Shear-banding Mediated Tensile Failure in Glasses
Author(s) Ethen T. Lund, David Richard, Jan Schroers, Eran Bouchbinder
On-Site Speaker (Planned) Ethen T. Lund
Abstract Scope The transition between necking-mediated tensile failure of glasses, at elevated temperatures and/or low strain rates, and shear-banding-mediated tensile failure, at low temperatures and/or high strain rates, is investigated using tensile experiments on metallic glasses and atomistic simulations. We experimentally and simulationally show that this transition occurs through a sequence of macroscopic failure patterns, parametrized by the ultimate tensile strength. Quantitatively analyzing the spatiotemporal dynamics preceding failure, using large scale atomistic simulations corroborated by experimental fractography, reveals how the collective evolution and mutual interaction of shear-driven plasticity and dilation-driven void formation (cavitation) control the various macroscopic failure modes. In particular, we find that, at global failure, the size of the largest cavity in the loading direction exhibits a nonmonotonic dependence on the temperature at a fixed strain rate, which is rationalized in terms of the interplay between shear- and dilation-driven plasticity. We also find that the size of the largest cavity scales with the cross-sectional area of the undeformed sample. Our results shed light on tensile failure of glasses and highlight the need to develop elastoplastic constitutive models of glasses incorporating both shear- and dilation-driven irreversible processes.
Proceedings Inclusion? Planned:

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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Dependence of the Nanometer-scale Structural Heterogeneity of a Bulk Metallic Glass on Its Fictive Temperature
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Devitrification, Phase Transformations and Properties of Rapidly Annealed Metallic Glasses
Evidence of Pre-crystallization Structures in a Metallic Glass
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Machine Learning Predictions of Glass Forming Ability
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Structural Response of Amorphous Solids to Elastic Strains
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The L–G Phase Transition in Binary Cu–Zr Metallic Liquids
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