Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 61: Liquid & Amorphous Metals I
MM 61.2: Vortrag
Donnerstag, 14. März 2013, 16:00–16:15, H26
Phase separation in liquid and amorphous metallic alloys — •Norbert Mattern1, Junhee Han1, Ulla Vainio2, Ahmed Shariq3, Pradeep Konda Gokuldoss4, Dierk Raabe4, and Jürgen Eckert1,5 — 1IFW Dresden, Institute for Complex Materials — 2Hasylab at Desy, Hamburg — 3FhG Center Nanoelectronic Technology, Dresden — 4MPI für Eisenforschung,Düsseldorf — 5TU Dresden,Institute of Materials Science
Phase-separated glasses are well known for oxide glasses and polymers. In the last years two-phase glasses were successfully prepared in different metallic alloy systems by rapid quenching from the melt. We report recent results on the influence of composition and casting conditions on the phase separation and the structure formation of glass forming metallic alloys Zr-M-Al-Gd (M =Cu,Co,). The decomposition in such alloys is a consequence of the large positive enthalpy of mixing between Zr and Gd (Hmix= +9 kJ/mole). We will show that early stages of spinodal decomposition can be obtained if the critical temperature of liquid-liquid phase separation is near to the glass transition temperature. Evidence of formation of Gd-enriched clusters by a spinodal mechanism is obtained by small-angle X-ray scattering and atom probe tomography.