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Glass formation criterion for various glass-forming systems
1Metals and Ceramic Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6115, USA.
Physical Review Letters
|October 4, 2003
Summary
A new method predicts glass-forming ability using the unified parameter gamma, considering crystallization and transition temperatures. This approach is validated across diverse materials like oxide glasses and metallic glasses.
Area of Science:
- Materials Science
- Physical Metallurgy
- Solid State Chemistry
Background:
- Evaluating glass-forming ability (GFA) is crucial for developing new noncrystalline materials.
- Existing methods often lack a unified approach applicable across diverse material systems.
- Understanding the physical factors governing GFA is essential for materials design.
Purpose of the Study:
- To propose a conceptual and unified approach for evaluating the glass-forming ability of various systems.
- To identify key physical parameters that determine the glass-forming ability of noncrystalline materials.
- To validate the proposed approach with experimental data from different glass types.
Main Methods:
- Developed a conceptual framework based on physical metallurgy principles.
- Introduced a unified parameter, gamma (γ), defined as Tx/(Tg+Tl).
- Validated the parameter by comparing predicted GFA with experimental data.
Main Results:
- Identified two primary factors influencing GFA: 1/(Tg+Tl) and Tx.
- Established a unified parameter gamma (γ = Tx/(Tg+Tl)) for predicting GFA.
- Demonstrated the effectiveness of the gamma parameter across oxide glasses, cryoprotectants, and metallic glasses.
Conclusions:
- The proposed conceptual approach provides a reliable method for assessing glass-forming ability.
- The unified gamma parameter offers a predictive tool for materials scientists and engineers.
- This framework enhances the understanding of the physical basis of glass formation in diverse systems.