|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||Deformation Mechanisms and Instabilities in Metallic Multilayer on the Nanoscale
||Stefan Sandfeld, Danial Pourjafar, Ruth Schwaiger
|On-Site Speaker (Planned)
Thin films and multilayers typically exhibit enhanced strength when grain size and/or layer thickness approach the length scale characteristic of the dominant deformation mechanisms. However, one also observes that the inherent heterogeneity of multilayers gives rise to the formation of shear bands or buckling of the layers, both of which may impair the mechanical performance of such structures.
We use a meso-scale simulation method – the Discrete Element Method (DEM) – to investigate mechanisms that cause plastic instabilities and shear-banding in multilayer composites. Our simulations are parametrized and validated based on dedicated nanoindentation experiments. Investigating the role of the mechanical properties of interfaces between layers allows us to give design recommendations for increased system stability. We will explain why the deformation morphology of metallic nanolayer systems strongly resembles those of geological folds.
||Planned: A print-only volume