Artículos de revistas
Selection of new glass-forming compositions in Al-La system using a combination of topological instability and thermodynamic criteria
Fecha
2009Registro en:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.512, n.1/Fev, p.53-57, 2009
0921-5093
10.1016/j.msea.2009.01.026
Autor
GARGARELLA, P.
KIMINAMI, C. S.
OLIVEIRA, Marcelo Falcão de
BOLFARINI, C.
BOTTA, W. J.
Institución
Resumen
A combination of an extension of the topological instability ""lambda 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 gamma* parameter of compositions with high GFA is higher, corresponding to a range in which the lambda 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 mu m in a wedge-section copper mold. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.