|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Plasticity of Face-centered Cubic Metallic Nanoparticles under Uniaxial Compression
||Selim Bel Haj Salah, Celine Gerard, Laurent Pizzagalli
|On-Site Speaker (Planned)
Plasticity of 3-80 nm FCC metallic nanoparticles is studied through molecular dynamic simulations on aluminum, copper and nickel nanoparticles submitted to uniaxial compression. Nanoparticles shape, crystallographic orientations, and size effect are investigated. Spherical nanoparticles and Wulff polyhedra are considered. Partial dislocations nucleate from the surface contact edges. Depending on the crystallographic orientation, the formation of pyramidal structures may be observed. The pyramid apex favors then dislocation nucleation. At first sight, the plasticity of Aluminum nanospheres tend to rely on dislocations mechanisms for most of crystallographic orientations whereas Copper and Nickel ones would tend to exhibit twin plasticity process. Nevertheless, factors driving the plasticity of nanoparticles are definitely more sophisticated, and the Schmid factor rule may be violated. It also appears that plasticity mechanisms and the yield stress do not depend on nanoparticle size. Instead, geometry and atomic structure of the layers in contact with the indenters control the plastic deformation.
||Planned: Supplemental Proceedings volume