|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||Plastic Deformation in Metal/Ceramic Multilayer Nanolaminates: NbC/Nb and TiN/Ti Case Studies
||Iman Salehinia, Wei Yang, Shuai Shao, Georges Ayoub, Jian Wang, Hussein Zbib
|On-Site Speaker (Planned)
Metal/ceramic multilayers combine high hardness of the ceramic layer and the high ductility of the metallic layer, enabling the design of novel composite coatings with high hardness and measurable ductility. This presentation reports our current molecular dynamics simulation results of the mechanisms of plastic deformation of metal/ceramic multilayer nanocomposites Nb/NbC and Ti/TiN. Metal/ceramic multilayers with various bi-layer period and also metal/ceramic thickness ratio are considered. Loading conditions include uniform compressive loading, nanoindentation, and bi-axial in-plane tension (compression). Roles of the interface structure, the initial dislocation density, temperature, and residual stresses on the plastic deformation, strength, ductility, and fracture behavior of case studies will be explored. Preliminary results show distinct difference between the plastic response of NbC/Nb and TiN/Ti multilayers. Cracks are formed in the NbC/Nb samples, while TiN/Ti samples with the same geometric parameters (thickness and thickness ratio) show a considerable amount of plasticity even at low temperature.
||Planned: A print-only volume