Imaging of transient structures using nanosecond in situ TEM.
The microstructure and properties of a material depend on dynamic processes such as defect motion, nucleation and growth, and phase transitions. Transmission electron microscopy (TEM) can spatially resolve these nanoscale phenomena but lacks the time resolution for direct observation. We used a photoemitted electron pulse to probe dynamic events with "snapshot" diffraction and imaging at 15-nanosecond resolution inside of a dynamic TEM. With the use of this capability, the moving reaction front of reactive nanolaminates is observed in situ. Time-resolved images and diffraction show a transient cellular morphology in a dynamically mixing, self-propagating reaction front, revealing brief phase separation during cooling, and thus provide insights into the mechanisms driving the self-propagating high-temperature synthesis.
Kim
Judy S
JS
Materials Science and Technology Division, Lawrence Livermore National Laboratory (LLNL), Livermore, CA 94550, USA. kim46@llnl.gov
Lagrange
Thomas
T
Reed
Bryan W
BW
Taheri
Mitra L
ML
Armstrong
Michael R
MR
King
Wayne E
WE
Browning
Nigel D
ND
Campbell
Geoffrey H
GH