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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Phase Transformation Across Multiscale Material Interfaces
Presentation Title Effect of Lattice-level Covalent Character on Phase and Interfacial Stability in Mg-alloys
Author(s) D Choudhuri, R Banerjee, Srinivasan Gopalan Srivilliputhur
On-Site Speaker (Planned) Srinivasan Gopalan Srivilliputhur
Abstract Scope Metallic bonding is classically characterized by the delocalization of valence electrons, and this idea has become accepted even in alloys. Recently we discovered localization of valence electrons along specific crystallographic directions of alloys. Using first principles calculations we show how such localization influences the formation of new phases and interfaces, and diffusion mechanisms. The altered bonding character will be demonstrated in Mg-Nd and Mg-Nd-Zn alloys, by showing that the proximity of Zn near Nd localizes valence electrons along the c-axis of hcp-Mg. This localization causes the formation of a new precipitate phase in Mg-Nd-Zn alloy, where the precipitate acquires a (0002) habit plane. Zn-induced covalent character also increases out-of-plane vacancy migration energies required for dislocation climb during creep deformation. Finally, we show that Zn segregates at strengthening precipitate / matrix interfaces, and stabilizes a formerly high-energy interface – consistent with experimental observations. * Funded by NSF DMREF DMR- 1435611
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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?
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

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