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M: Metallphysik

M 7: Glasdynamik

M 7.2: Vortrag

Montag, 8. März 2004, 15:00–15:15, H16

On the relation between fragility, thermodynamic properties and thermal stability of Pd-rich bulk-glass forming alloys — •Gerhard Wilde — Forschungszentrum Karlsruhe, Institute of Nanotechnology, P.O.B. 3640, 76021 Karlsruhe

It has been suggested that thermal stability and fragility of (metallic) glasses are related such that the less fragile systems are more stable. Moreover, it has been proposed that fragility and the temperature dependence of the excess thermodynamic properties, e.g. the differences in specific heat between the undercooled melt and the crystalline equilibrium phases are directly correlated. Consequently, it would be expected that the most fragile systems show the highest stability and the largest temperature dependence of the excess thermodynamic properties, especially if chemically similar alloys are compared. In order to check these assumptions, a complete set of experimental data for different Pd-rich bulk glass forming alloys, i.e. Pd40Ni40P20, Pd77.5Cu6Si16.5 and Pd43Cu27Ni10P20, has been used to perform a detailed comparison between the fragility characteristics and the thermal stability of the chemically similar alloys.