On calorimetric study of the fragility in bulk metallic glasses with low glass transition temperature: (Ce0.72Cu0.28) 90-x Al10Fex (x = 0, 5 or 10) and Zn 38Mg12Ca32Yb18
Résumé
Compared with conventional bulk metallic glasses, Ce-based and Zn-based bulk metallic glasses have received considerable attention because of their possible application as structural and functional materials. Kinetic fragility parameter m in amorphous material presents degree of deviations from the Arrhenius law above the glass transition temperature (Tg) of the material. Kinetic fragility parameter (m) and Kauzmann temperature (T K) in (Ce0.72Cu0.28)90-x Al 10Fex (x = 0, 5 or 10) and Zn38Mg 12Ca32Yb18 bulk metallic glasses have been determined by differential scanning calorimetry (DSC). Results show that Zn 38Mg12Ca32Yb18 presents a higher m than (Ce0.72Cu0.28)90-x Al10Fe x (x = 0, 5 or 10). The activation energies Eg for glass transition are 1.51 eV (x = 0), 1.59 eV (x = 5) and 1.83 eV (x = 10) in (Ce 0.72Cu0.28)90-x Al10Fex (x = 0, 5 or 10), and 3.59 eV in Zn38Mg12Ca 32Yb18, respectively. The values of Eg increase with increasing the Fe content in (Ce0.72Cu0.28) 90-x Al10Fex (x = 0, 5 or 10) bulk metallic glasses. Kinetic fragility parameter m of bulk metallic glasses increases with the glass transition temperature Tg of bulk metallic glasses, in agreement with previous investigations. © 2011 Elsevier Ltd. All rights reserved.
Mots clés
Glass transition
Glass
Functional materials
Temperature
Ytterbium
Intermetallics
A. Intermetallics
Arrhenius law
B. Glasses
metallic
Bulk metallic glass
E. Physical properties
Fe content
Kauzmann temperature
Kinetic fragility
Activation energy
Aluminum
Calcium
Copper
Differential scanning calorimetry
Kinetics
Zinc
Metallic glass