Selection of new glass-forming compositions in Al–La system using a combination of topological instability and thermodynamic criteria
✍ Scribed by P. Gargarella; C.S. Kiminami; M.F. de Oliveira; C. Bolfarini; W.J. Botta
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 957 KB
- Volume
- 512
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
A combination of an extension of the topological instability " criterion" and a thermodynamic criterion were applied to the Al-La system, indicating the best range of compositions for glass formation. Alloy compositions in this range were prepared by melt-spinning and casting in an arc-melting furnace with a wedge-section copper mold. The GFA of these samples was evaluated by X-ray diffraction, differential scanning calorimetry and scanning electron microscopy. The results indicated that the * parameter of compositions with high GFA is higher, corresponding to a range in which the parameter is greater than 0.1, which are compositions far from Al solid solution. A new alloy was identified with the best GFA reported so far for this system, showing a maximum thickness of 286 m in a wedge-section copper mold.