|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||Spall of Tantalum Bicrystals and Nanocrystals
||Eric Hahn, Tim Germann, Eduardo Bringa, Marc Meyers, Saryu Fensin
|On-Site Speaker (Planned)
Grain boundaries play a significant role in the mechanical response of nanostructured materials. Molecular dynamics simulations were used to simulate coincidence-site-lattice symmetric tilt boundaries and nanocrystals of body-centered cubic tantalum. Samples are then subjected to shock deformation, allowing us to investigate material strength and damage under extreme conditions. Predictions based on traditional theory suggest that, as strain-rate increases, tensile strength should increase. Alternatively, as grain size decreases, tensile strength may decrease due to an increased propensity to fail at a growing volume fraction of grain boundaries. We evaluate the strength of specific grain boundaries in addition to grain size dependent spall failure.
||Planned: A print-only volume