|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Thermo-mechanical Characterization of Materials with Special Emphasis on In Situ Techniques
||In Situ TEM Imaging of Defects in Metallic Samples Deforming at High Strain Rates
||Thomas Voisin, Michael D Grapes, Yong Zhang, Nicholas J Lorenzo, Jonathan P Ligda, Brian E Schuster, Tian Li, Melissa Santala, Geoffrey H Campbell, Timothy P Weihs
|On-Site Speaker (Planned)
To accurately understand and predict the dynamic properties of metals deforming at high strain rate, one can benefit by observing directly defect motion such as dislocations slip and twinning. In this presentation we describe a novel TEM technique that enables one to image the motion, the evolution and the interaction of defects within metallic specimens deforming at high strain rates. The Dynamic TEM at the Lawrence Livermore National Laboratory was used to record 9-frames movies with a delay between frames as short as 50ns while a novel TEM straining stage loads specimens in tension at strain rates as high as 4x10^3/s. The specimens are prepared from bulk samples using femtosecond laser machining and ion milling. Our most recent DTEM observations will be presented and they will be compared with results from in situ straining experiments performed at quasi-static strain rates in a conventional TEM.
||Planned: Supplemental Proceedings volume