Magneto-optical Control of Ordering Kinetics and Vacancy Behavior in Fe-Al Thin Films Quenched by Laser
| Autor: | Pashenkin, I. Yu., Tatarskiy, D. A., Churin, S. A., Nechay, A. N., Drozdov, M. N., Sapozhnikov, M. V., Polushkin, N. I. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | One of issues arising in materials science is a behavior of non-equilibrium point defects in the atomic lattice, which defines the rates of chemical reactions and relaxation processes as well as affects the physical properties of solids. It was previously predicted that melting and rapid solidification of metals and alloys provides a vacancy concentration in the quenched material, which can be comparable to that quantity at the point of melting. Here, we experimentally explore the vacancy behavior in thin films of the quasi-equiatomic Fe-Al alloy subjected to nanosecond laser annealing with intensities up to film ablation. The effects of laser irradiation are studied by monitoring magneto-optically the ordering kinetics in the alloy at the very ablation edge, within a narrow (micron-scale) ring-shaped region around the ablation zone. Quantitatively, the vacancy supersaturation in the quenched alloy has been estimated by fitting a simulated temporal evolution of the long-range chemical order to the obtained experimental data. Laser quenching (LQ) of alloys and single-element materials would be a tool for obtaining novel phase states within a small volume of the crystal. Comment: 19 pages, 6 figures, submitted to a refereed journal |
| Databáze: | arXiv |
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