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

Article

关键词: EQUATION-OF-STATE;    INNER-CORE;    IRON;    ANISOTROPY;    WAVE;    CONSTRAINTS;    TRANSITION;    PRESSURES;    DIAGRAM;   

DOI  :  10.1103/PhysRevB.105.L220102

来源: SCIE

【 摘 要 】

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-Si-8.5 wt % in <= 130 ps at similar to 130 GPa; no transformation is observed in Fe-Si-16 wt % up to 110 GPa. Density functional theory calculations predict similar phase relations.

【 授权许可】

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