About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Bulk Metallic Glasses XVII
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Presentation Title |
Is Atomic Size-mismatch a Sufficient Condition to Yield Fragility in Bulk Metallic Glass Forming Liquids? |
Author(s) |
Tina Mirzaei, Zhichao Yu, Jamie J.Kruzic, P.Alex Greaney |
On-Site Speaker (Planned) |
Tina Mirzaei |
Abstract Scope |
Fragility in a liquid refers to the sensitivity of its bonding network and is associated with non-Arrhenius dependance of the liquid’s viscosity as it approaches the glass transition temperature. In bulk metallic glasses (BMGs), ductility in the glassy state correlate with fragility as a liquid, so understanding the origins of fragility could provide insights into plasticity mechanisms in BMGs. Experimentally, there are qualitative differences in temperature dependance of the medium range order in strong vs fragile liquids. This hints at differences in cooperative packing of atoms, and lead us to ask: is atomic size mismatch sufficient to cause fragility? Presented are a series of molecular dynamics simulations in which known strong and fragile BMGs are represented by hypothetical alloys with the same mixture of atomic radii, but with all atoms interacting via the same bonding. Remarkably, these radii alloys display many of the signatures of fragility as their real-life counterparts. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |