|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Dynamic TEM In Situ Mechanical Testing: Characterization of Defects Motion at High Strain Rates
||Thomas Voisin, Michael D., Tian Li, Jonathan P. Ligda, Nicholas J. Lorenzo, Brian E. Schuster, Melissa K. Santala, Yong Zhang, Xiaolong Ma, Geoffrey H. Campbell, Timothy P. Weihs
|On-Site Speaker (Planned)
Defect nucleation, interactions and propagation through the microstructure have been widely studied by in situ TEM mechanical testing but never when samples were deforming at high strain rate. However, imaging dislocation and twin nucleation and propagation will enhance our ability to understand and predict dynamic behavior and spall strength. We use the Dynamic TEM at the Lawrence Livermore National Laboratory, the only TEM able to record 9 pictures with delays between each picture as short as 50ns. We also designed and built a new TEM holder capable of deforming samples at strain rates ranging from quasi-static up to 4x103/s. We will present the latest results on copper and magnesium specimens and compare to in situ TEM tensile tests done at quasistatic strain rate. Work conducted at the LLNL DTEM facility was performed under the auspices of the U.S. Department of Energy, by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
||Planned: Supplemental Proceedings volume