| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Structure and Properties of bcc Mg Synthesized Using Interface Strain Engineering |
| Author(s) |
Siddhartha Pathak, Kevin Jacob, Manish Jain, Krishna Yaddanapudi, Marko Knezevic, Irene Beyerlein |
| On-Site Speaker (Planned) |
Siddhartha Pathak |
| Abstract Scope |
We summarize our recent efforts in understanding the hcp-to-bcc pseudomorphic phase transformation of Mg in Nb/Mg nanolaminates. The structure of the hitherto-unknown bcc Mg phase in the Nb/Mg multilayer nanocomposite is investigated using TEM under ambient pressures and in a diamond anvil cell using synchrotron radiation under high pressures. The mechanical properties were investigated under extremes of temperature and strain rate using micro-pillar and micro-tensile experiments. Surprisingly, our results demonstrate simultaneous improvements in both strength and mechanical stability of Nb/Mg nanolaminates with decreasing layer thicknesses, a trend seldom reported in nanolaminates consisting of pure metals. Instead of a strength plateau, the hcp-to-bcc phase transition in Mg results in a renewed strengthening regime in the nanolaminate caused by the change to a coherent interface from an incoherent one, along with a concurrent increase in strain-to-failure due to the introduction of a more plastically isotropic bcc material from an anisotropic hcp structure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Mechanical Properties, Thin Films and Interfaces |