|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Interface Driven Mechanical Behavior of Mg/Nb Nano-layered Composites
||Milan Ardeljan, Irene J. Beyerlein, Siddhartha Pathak, Marko Knezevic
|On-Site Speaker (Planned)
We combine experiments and crystal plasticity finite element modeling to examine the deformation mechanisms operating in two-phase Mg/Nb layered composites. It has been shown that when the spacing between the Mg/Nb interfaces is below 10 nm, the pure Mg phase can transform from its hexagonal close packed (hcp) into a body center cubic (bcc) crystal structure at ambient pressures and room temperature. Furthermore, micro-pillar testing of nanocomposites below and above the critical thickness have shown that compared to the hcpMg/Nb nanocomposite, the bcc Mg has a higher strain to failure, and is 50% stronger, and retains its hardness after extended exposure to 200 C. The results suggest that the difference in the coherent bccMg/Nb and incoherent hcpMg/Nb interfaces of these two composites plays a strong role in how they interact with dislocations and in the relative contributions of the different modes of slip used to accommodate the applied deformation.
||Planned: Supplemental Proceedings volume