Presentation Title

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.

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May 8th, 9:30 AM May 8th, 10:00 AM

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.