Electron microscopy
 
Glass Forming Ability (GFA) from Melts
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM Book                                                                                   http://www.globalsino.com/EM/        

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
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It has been accepted that any material can vitrify if cooled from the molten state to the glass transition temperature, Tg, at a cooling rate fast enough to prevent crystallization. The slowest a material can be cooled down to Tg without crystallization, the better the glass forming ability (GFA) is.

Some factors influence the glass forming ability significantly:
        i) Highly viscous liquids have higher glass forming ability as the higher viscosity of the liquids implies smaller diffusivity and thus limits the atomic mobility and the nucleation at higher temperatures. In general, multi-component systems with more than two components reduce the free volume and increases the viscosity.
        ii) Mismatch between the sizes of the components influences the glass forming ability, as the chemical disorder increases because of the local atomic strains originating from both the atomic mismatch and the difference in valence electron configurations.
        iii) Higher reduced glass transition temperature, Trg, improves the glass-forming ability. Trg is the ratio of the glass transition temperature Tg to the melting temperature Tm of an alloy.

 

 

 

 

 

 

 

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