Berlin 2024 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 55: Liquid and Amorphous Materials II
MM 55.2: Vortrag
Donnerstag, 21. März 2024, 10:30–10:45, C 230
Phase Separation in Ce-Al (Ga) Metallic Glasses — •Devinder Singh1,2 and Jürgen Eckert1,3 — 1Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700 Leoben, Austria — 2Amity School of Applied Sciences, Amity University, 226028 Lucknow, India — 3Department of Materials Science, Montanuniversität Leoben, Jahnstraße 12, 8700, Leoben, Austria
In recent years, much attention has been given to phase separated metallic glasses (MGs) which provide a unique opportunity for designing alloys/ composites with hierarchical microstructure at different length scales. The structure and physical properties of phase separated MGs have characteristics different from those of other MGs. Many theoretical efforts have been undertaken to understand the origin of phase separation; yet the understanding of the mechanism is insufficient.
In this presentation, results of our recent studies on the role of Ga substitution in place of Al in Ce-Al (Ga) MGs will be discussed with the aim to understand the genesis of phase separation. The rationale of phase separation could not be explained in terms of enthalpy of mixing of the three possible binaries in this system. The X-ray absorption spectroscopy (XAS) spectra of Ce-based melt-spun ribbons have shown appearance of 4f0 delocalized states in Ga substituted alloys. Such a substitution has led to shortening of Ce-Ce distance in the alloys owing to chemical pressure leading to creation of two types of distinct major clusters. This work, therefore, opens up new direction of research for delineating issues pertaining to phase separation in amorphous systems.
Keywords: metallic glass; phase separation; microstructure; structure-property; atomic cluster