Fragility and Glass Forming Ability of Ni-based Bulk Metallic Glasses
Presenter Status
Graduate Student
Session
A-2
Location
CSH Room 108
Start Date
8-5-2014 9:30 AM
End Date
8-5-2014 10:00 AM
Presentation Abstract
The liquid fragility of metallic glasses has been long recognized as an important part of understanding glass forming ability (GFA). However, there hasn’t been a good understanding of how to relate the kinetics and thermodynamics of undercooled melts to GFA. In working with a new Ni-based system, a model has been developed that is able to explain the changes in GFA with composition, relying only on two experimental parameters: fragility and reduced glass transition temperature. Experimental results show a surprisingly large composition dependence on fragility, providing validation of the model and motivating a stronger emphasis on understanding the fundamental basis of fragility. These results present new opportunities to explain the nature of GFA for other well-known glass forming systems.
Fragility and Glass Forming Ability of Ni-based Bulk Metallic Glasses
CSH Room 108
The liquid fragility of metallic glasses has been long recognized as an important part of understanding glass forming ability (GFA). However, there hasn’t been a good understanding of how to relate the kinetics and thermodynamics of undercooled melts to GFA. In working with a new Ni-based system, a model has been developed that is able to explain the changes in GFA with composition, relying only on two experimental parameters: fragility and reduced glass transition temperature. Experimental results show a surprisingly large composition dependence on fragility, providing validation of the model and motivating a stronger emphasis on understanding the fundamental basis of fragility. These results present new opportunities to explain the nature of GFA for other well-known glass forming systems.