|About this Abstract
||MS&T23: Materials Science & Technology
||Interface-mediated Phenomena in Structural Materials
||Understanding the Interface Strain Induced HCP→BCC Phase Transformation in Nanolaminate Mg
||Kevin Jacob, Siddhartha Pathak
|On-Site Speaker (Planned)
In this work, interface strain engineering of Mg with Nb is exploited to transform HCP Mg into a stable BCC Mg at ambient pressures within an Mg/Nb multilayered nanocomposite, having adjacent interfaces spaced within a few nanometers. Mg otherwise exists in a BCC phase only at pressures of 50 GPa and above. Earlier studies on pseudomorphic phase transformation have focused on the effect of the interface next to the substrate during growth of films. The effects of subsequent interfaces are also examined in this work through a new deposition strategy. Our results provide a more holistic idea of the mechanism of pseudomorphic phase transformation involved in these multilayers. These depositions help understand the effects, different interfaces have individually and combined on the pseudomorphic behavior of Mg in Mg/Nb nanolaminates. Micro pillar compression tests on the fine-tuned microstructure shed light on the mechanical behaviour of these composites with similar layer thicknesses.