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Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 4: Liquid and Amorphous Metals I

MM 4.4: Vortrag

Montag, 14. März 2011, 11:45–12:00, IFW D

Structure conserving correlation and the Kohlrausch-Williams-Watts relaxation in simulated metallic-glass forming Ni0.5Zr0.5 — •Helmar Teichler — Institut f. Materialphysik, Univ. Göttingen

In glass forming melts near the glass temperature, the alpha-decay reflects relaxation processes with Kohlrausch-Williams-Watts behaviour on macroscopic time scales. Microscopic explanation of these fundamental features is a challenging open question, which needs to understand emergence of slow relaxation with non-exponential response from atomic motions in the melt. Regarding this, we here present an analysis of molecular dynamics simulation results for glass forming Ni0.5Zr0.5. In detail it is shown that (a) the fraction of weakly effective particles (WEPs, in essence the immobile, vibrating atoms) determines the alpha-decay of the incoherent intermittent scattering function (ISF), (b) the WEPs exhibit strong temporal correlations in the way that particles acting as WEPs in an initial time window tend to act as WEPs also at later times, (c) this correlation makes that the alpha-process shows KWW-relaxation while uncorrelated change of particles between immobile and mobile behaviour yields Debye-relaxation.

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