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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Phase Transformation Across Multiscale Material Interfaces
Presentation Title Structure and Properties of BCC Mg Synthesized Using Interface Strain Engineering
Author(s) Siddhartha Pathak, Manish Jain, Marko Knezevic , Nenad Velisavljevic, Nathan A Mara , Irene J Beyerlein
On-Site Speaker (Planned) Siddhartha Pathak
Abstract Scope In this work, interface strain engineering of Mg with Nb is exploited to transform hexagonal closed packed (hcp) Mg into a stable body centered cubic (bcc) Mg at ambient pressures and the adjacent Mg/Nb interfaces are spaced within a few nanometers forming multilayered Mg/Nb nanocomposite. TEM and synchrotron radiation XRD studies using diamond anvil cell experiments reveal that the Mg hcpbcc phase transition occurs at layer thicknesses of 8-9 nm. The mechanical response of bcc Mg was also investigated using micropillar compression testing on Mg/Nb composites of similar layer thicknesses but different crystal structure, such as Mg(bcc)/Nb 5nm/5nm vs. Mg(hcp)/Nb 10nm-10nm. Our results demonstrate that bcc Mg when introduced into a nanocomposite is far more ductile and 50% stronger, and retains its strength after extended exposure to 200 C (0.5 times its homologous temperature). These findings reveal an alternative solution to obtaining lightweight metals critically needed for future energy efficiency.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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