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
Résumé
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.
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