|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Micro-compression Testing of Mg-Nb Multilayered Nano-composites for Ultra-high Strength, Formability and Ductility
||Manish Jain, Nenad Velisavljevic, Marko Knezevic, Irene J Beyerlein, Nathan Mara, Siddhartha Pathak
|On-Site Speaker (Planned)
In this work we explore the mechanical response of Mg-Nb multilayered nanocomposites as a function of decreasing layer thickness. Layers of Mg and Nb, with individual layer thicknesses varying from 5 to 50 nm, were synthesized using physical vapor deposition. Transmission electron microscopy (TEM) and X-Ray diffraction (XRD) studies reveal an interface strain induced phase transition in Mg from hexagonal close-packed (HCP) to a metastable body centered cubic (BCC) structure at Mg layer thicknesses of 8-9 nm. Using a combination of indentation testing and micro-pillar compression experiments – where the multilayers were tested in 3 different orientations: with interfaces oriented normal, parallel and inclined 450 to the loading axis – we analyze the elastic and plastic anisotropy of this hitherto unstudied BCC Mg structure. These studies reveal BCC Mg when introduced into a nanocomposite is far more ductile and 50% stronger, suggesting significant implications for potential lightweight aerospace and automotive applications.
||Planned: Supplemental Proceedings volume