Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 47: Liquid and Amorphous Metals III

MM 47.6: Vortrag

Freitag, 27. März 2009, 11:30–11:45, IFW A

Enthalpy relaxation study of Zr45.0Cu39.3Al7Ag8.7 bulk metallic glass and quantification of its free volume by free-volume theory — •Yue Zhang, Horst Hahn, and Herbert Gleiter — Institute of Nanotechnology, Forschungszentrum Karlsruhe, Germany

Enthalpy relaxation study of Zr45.0Cu39.3Al7Ag8.7 bulk metallic glass (BMG) is performed at 648, 658, 668, 678 and 684 respectively. It is found that the recovered enthalpy follows the VFT relationship, the fragility parameter D and characteristic temperature T0 are 15.9 and 475K respectively. The activation energy Ea of the glass transition is derived from a modified Kissinger method. Finally, the free volume in the samples is calculated using free-volume theory with D, T0 and Ea as parameters.