X-ray diffraction study of phase transformation dynamics of Fe and Fe-Si alloys along the shock Hugoniot using an x-ray free electron laser

The x-ray free electron laser (XFEL) enables probing highly compressed material response at the subnanosecond timescale. We exploit the ultrafast XFEL pulse to combine reflection x-ray diffraction and laserdriven shock compression to perform a study of phase transformation and stability in iron and...

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Bibliographic Details
Published in:Physical review. B 2022-06, Vol.105 (22), Article L220102
Main Authors: Krygier, A., Harmand, M., Albertazzi, B., McBride, E. E., Miyanishi, K., Antonangeli, D., Inubushi, Y., Kodama, R., Koenig, M., Matsuoka, T., Mogni, G., Pietrucci, F., Saitta, A. M., Togashi, T., Umeda, Y., Vinci, T., Yabashi, M., Yabuuchi, T., Fiquet, G., Ozaki, N.
Format: Article
Language:English
Subjects:
Condensed Matter
density functional calculations
dynamical phase transitions
Lasers
lattice dynamics
MATERIALS SCIENCE
Physics
shock waves
structural phase transition
x-ray diffraction
x-ray lasers
x-ray powder diffraction
x-ray techniques
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Summary:The x-ray free electron laser (XFEL) enables probing highly compressed material response at the subnanosecond timescale. We exploit the ultrafast XFEL pulse to combine reflection x-ray diffraction and laserdriven shock compression to perform a study of phase transformation and stability in iron and Fe-Si alloys. Our approach enables us to observe that solid-solid phase transformations occur in iron and Fe-Si8.5wt% in ≤130 ps at ∼130 GPa; no transformation is observed in Fe-Si16wt% up to 110 GPa. Density Functional Theory calculations predict similar phase relations.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.105.L220102