Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 65: Liquid & Amorphous Metals II
MM 65.1: Vortrag
Donnerstag, 14. März 2013, 17:15–17:30, H26
Study of crystallization behavior during ultrafast heating of metallic glasses — •Stefan Küchemann1, Jonas Rübsam1, Carsten Mahn1, Goodwin Gibbins4, Norbert Mattern3, Marios Demetriou2, William Johnson2, and Konrad Samwer1 — 11. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany — 2Keck Laboratories of Engineering, California Institute of Technology, Pasadena, CA 91125, USA — 3Leibniz Institut für Festkörper- und Werkstoffprüfung Dresden, 01171 Dresden, Germany — 4University of Cambridge, Cambridge, UK
In this contribution, metallic glasses have been heated up homogeneously using a rapid capacitor discharge technique [1]. The heating rates of this technique are typically in the order of 106 K/s which allow experimental studies prior to the crystallization for temperatures up to the melting temperature or even suppress the crystallization completely.
In order to study the crystallization behavior of varios Zr-based glass formers, hard X-ray diffraction experiments have been performed at P07 beamline at DESY. To resolve short-time structural changes, the temporal resolution of the 2D Detector could be successfully increased up to 5 ms response time by using a newly developed chopper system.
For the metallic glass Zr65Cu27.5Al7.5, the results show interesting features in the liquid state prior to the final crystalline stable phase.
Financial support by DFG within SFB 602 is gratefully acknowledged.
[1] William L. Johnson et al., Science 332, 828 (2011)