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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

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Analysis of the Stability of Interfaces Fabricated Using Solid State Welds
Atom Probe Tomography Study of Interface Diffusion Assisted Self-healing Behaviour of Cr2Al(Si)C MAX Phase Coatings
Atomic-scale Characterization of Solute Segregation in Interfaces in Light Alloys
Effect of Lattice-level Covalent Character on Phase and Interfacial Stability in Mg-alloys
Efficient and Systematic Study of Phase Transformations Using Dual-anneal Diffusion Multiples
Exploiting Non-conventional Pathways for Transformations and Microstructural Evolution in Metastable Beta Ti Alloys
Grain Boundary Microstates under Irradiation: Which Came First?
Interdiffusion and Kinetics Study of Ti-Al Intermetallic by Brazing
Microstructural Characterization of Linear Friction Welded Interfaces in Ti-based Alloys
Modeling of Complexion Transitions at One- and Two-dimensional Defects
Modeling Transitions at Interfaces
Morphological Evolution and Mechanical Behavior of Co-sputtered Cu-Mo Thin Films
Nanoscale Interfacial Phase Structures in Roll-bonded Metallic Glass Composite Materials
Prevention of Coarsening Induced Phase Transformations in Al-Cu Alloys: Role of Interfaces
Roles of Transformation Interface for Controlling Microstructure and Properties of High Strength Steels
Structure and Mechanical Response of Highly Defective Grain Boundaries
Structure and Properties of BCC Mg Synthesized Using Interface Strain Engineering
The Effect of Diffusion on the Microstructure and Properties of a NiAl-based Anchor Phase Coating for CMSX-4
Transient-liquid-phase-bonding and Mechanical Properties of Ni-based-superalloy-H230 for Heat Exchangers in Supercritical CO2 Power Cycles

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