Exploration of ultra-fast time scales in metallic glasses and crystals
- Date: May 10, 2023
- Time: 10:00 AM - 11:00 AM (Local Time Germany)
- Speaker: Prof. Isabella Gallino
- Chair of Metallic Materials at Saarland University
- Location: Max-Planck-Institut für Eisenforschung GmbH
- Room: Large Conference Room No. 203
- Host: on invitation of Prof. Gerhard Dehm
Understanding the nature of transitions between the glassy, liquid and crystalline states is a major challenge in physics as well as in materials science. With the emergence of advanced fast calorimetry, based on a chip-technology, we can nowadays access shorter and shorter time scales and thus experimentally measure the thermophysical properties of materials far from equilibrium. In this talk, we build on established and new work that our group has performed with this technique at ultra-short time scale for the study of many material characteristics. Selected topics include: TTT-diagrams near the nose for crystallization1, glass formation from the melt in metallic glass-forming systems2,3, hierarchical physical aging in bulk metallic glasses4, as well as studies of the diffusion and reaction kinetics in reactive nanocrystalline multilayered thin films for 5 orders of magnitude of heating rates5,6.
1 M. Frey et al., Determining and modelling a complete time-temperature-transformation diagram for a Pt-based metallic glass former through combination of conventional and fast scanning calorimetry, Scripta Materialia 215 (2022) 114710. DOI: 10.1016/j.scriptamat.2022.114710.
2 X. Monnier, D. Cangialosi, B. Ruta, R. Busch, I. Gallino, Vitrification decoupling from α-relaxation in a metallic glass Science Advances 6, eaay1454 (2020). DOI: 10.1126/sciadv.aay1454
3 V. Di Lisio, I. Gallino, et al., Size-dependent vitrification in metallic glasses, Nature Communication (2023) under revision.
4 I. Gallino, et al., Hierarchical aging pathways and reversible fragile-to-strong transition upon annealing of a metallic glass former, Acta Materialia 144 (2018) 400-410. DOI: 10.1016/j.actamat.2017.10.060.
5 A. Wang, I. Gallino, et al., Ultrafast formation of single phase B2 AlCoCrFeNi high entropy alloy films by reactive Ni/Al multilayers as heat source, Materials & Design 206 (2021) 109790. DOI: 10.1016/j.matdes.2021.109790.
6 S.S. Riegler et al., Nanocalorimetry reveals a two-stage interdiffusion mechanism and reaction kinetics in nanoscaled Ni/Al multilayers over five orders of magnitude of heating rates, (2023) unpublished