- Letter
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
Phys. Rev. B 105, L220102 – Published 7 June, 2022
DOI: https://doi.org/10.1103/PhysRevB.105.L220102
Abstract
The x-ray free electron laser (XFEL) enables probing a highly compressed material response at the subnanosecond timescale. We exploit the ultrafast XFEL pulse to combine reflection x-ray diffraction and laser-driven shock compression to perform a study of the phase transformation and stability in Fe and Fe-Si alloys. Our approach enables us to observe that solid-solid phase transformations occur in Fe and Fe- in ps at GPa; no transformation is observed in Fe- up to 110 GPa. Density functional theory calculations predict similar phase relations.