Fundamental Mechanisms of Transient States in Materials Quantified by DTEM

Research

Our objective is to understand the characteristics of an “optimal” grain boundary network that minimizes microstructural evolution in radiation environments. Through our research, we have elucidated that this optimal network requires a balance between two populations of grain boundaries: low-free-volume (low-free-energy) special interfaces that, appropriately coordinated, prevent coarsening; and low-crystallographic-order (high-free-energy) random grain boundaries that are efficient sinks for radiation-induced defects.

Personnel working on experiments.

Rapid in situ phase transformations

Dynamic Transmission Electron Microscope (DTEM) quantifies kinetics of rapid phase transitions with time-resolved images.

DTEM quantifies kinetics of rapid phase transitions with time-resolved images.

 

Geoffrey Campbell

Geoffrey Campbell

Principal Investigator for Laser Crystallization of Phase Change Material

campbell7 [at] llnl.gov