Probe materials dynamics at multiple temporal and spatial scales

罗胜年

西南交通大学

摘要

One of the grand challenges in materials physics is dynamic response to impulsive loading, including stress waves, radiation, and pulsed fields, due to their highly transient nature and extremely complex microstructure effects. Dynamic responses, such as plasticity, damage, cavitation, phase changes, and chemical reactions, are inherently multiscale and heavily dependent on microstructure. One has to resort to a suite of tools, including experiments, simulations, and theory. However, the gaps in spatial or temporal scales between experiments and simulations are still wide, while cross-scale theories are still in early development. In particular, intense laser-induced X-rays, synchrotron radiation and X-ray free electron lasers, offer unprecedented opportunities for exploring matter at dynamic extremes. Here, we report our experimental, simulation and theoretical studies on plasticity, damage and phase transitions along this line, using such tools as ultrafast X-ray imaging, scattering and spectroscopy, to probe materials response at length scales ranging from atom to micron, and time scales, from femtosecond to second.

DOI: 10.12110/firstfmge.20171121.303