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】
Free