|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation Mechanisms
||A Novel In Situ TEM Technique: High Strain Rate Tensile Testing in the Dynamic TEM
||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)
Current TEM characterization of metals deforming at high strain rates is limited to pre and post-test observations. However, observing dislocation slip and twinning in situ can improve our ability to understand and accurately predict the dynamic properties of metals. We describe a novel technique developed to address this need. Specimens are fabricated from bulk samples using femtosecond laser machining and ion milling, and they are loaded in tension up to 4 x 10^3/s using a novel TEM straining stage. Rapid defect nucleation and motion are captured using the Dynamic TEM at the Lawrence Livermore National Laboratory in which we record 9-frames movies with a delay between frames ranging from 50ns to 5us. The most recent DTEM observations on pure copper and magnesium alloys will be presented, and 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