The 8th International Conference on Matter and Radiation at Extremes (ICMRE2025)

96 / 2025-03-14 10:01:49

Dynamic path depended on the loading direction

Dynamic compression,twinning,phase transition,dynamic path

Understanding the atomic-scale behaviors of materials under dynamic loading conditions is crucial for comprehending their complex responses at high strain rates, with implications across various research fields including material science, geophysics, and defense industries. One prevalent method for this investigation is dynamic X-ray diffraction (DXRD), which utilizes pulsed X-ray sources to analyze the crystal structures of materials undergoing dynamic compression or decompression^[1]. The XRD based on the laser-induced X-ray can provide a curve of the diffraction pattern and it is useful to determine the dynamic path of the crystal under extreme laser loading. We conducted different dynamic experiments on SG-II laser facility^[2]. The Laue diffraction pattern and Bragg diffraction pattern were obtained. We developed a forward code-LaXRD for data analysis. After analysis, we found that the slip system  worked and the dislocation is obvious from the non-parallel phenomena of the angle less than 5 degrees between dynamic diffraction line and matrix diffraction line when the laser loading direction is parallel to the orientation [100] of Fe crystal. While laser loading in other direction, twinning occurs. Besides that the phase transition occurs, but not all of them are consistent with the path of the Burgers mechanics. This is different the one of Fe at high pressures up to 80 GPa using DAC at the at beamline BL10XU at SPring-8^[3]