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M: Metallphysik

M 25: Flüssige und amorphe Metalle II

M 25.1: Vortrag

Dienstag, 25. März 2003, 11:45–12:00, IFW D

THERMAL BEHAVIOR OF BULK METALLIC GLASSES — •Norbert Mattern¹ and Jan Sakowski² — ¹IFW Dresden — ²Universitaet Rostock

The thermal behavior of the structure of Pd40Cu30Ni10P20 bulk metallic glass has been investigated in situ through the glass transition by means of high temperature X-ray synchrotron diffraction. The dependence of the X-ray structure factor S(q) of the Pd40Cu30Ni10P20 glass on temperature follows the Debye theory up to the glass transition with a Debye temperature of 296 K. Above the glass transition temperature Tg the temperature dependence of S(q) is altered pointing to a continuous development of structural changes in the liquid with temperature. The atomic pair correlation functions g(r) indicate changes in short-range order parameters of the first and the second neighborhood with temperature. The temperature dependence of structural parameters is different for the glass and in the supercooled liquid with a continuous behavior through the glass transition. The inter-atomic distances of higher coordination shells expand analogously to the macroscopic linear thermal expansion.