About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XVII
|
Presentation Title |
The Intriguing Structure of Marginal Glass Forming Alloys |
Author(s) |
Tolga Han Ulucan, İlkay Kalay, Yunus Kalay |
On-Site Speaker (Planned) |
Tolga Han Ulucan |
Abstract Scope |
Marginal metallic glass-forming alloys exhibit unique devitrification features due to their exceptional primary crystallization products of Al nanocrystals with populations of 1024m-3. A full agreement on how this abnormal nucleation event occurs is still lacking. Our previous studies on Al-RE (RE: rare-earth) have shown that two different amorphous precursors prepared using melt-spinning and magnetron sputtering techniques showed clear differences in phase selection hierarchy upon continuous heating. We believe that this difference is originated from the medium range ordered structure, exist in as-quenched melt-spun ribbon which is inherited from its molten state. In this study we investigated the local structure, chemistry and any possible higher order correlations in the amorphous and liquid state by performing critical high energy synchrotron X-ray Diffraction, EXAFS, ab-initio and Reverse Monte Carlo modelling. RE atoms were found to be highly correlated with Al atoms which results in formation of network dividing the amorphous and liquid matrix. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |