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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Phase Transformation Across Multiscale Material Interfaces
Presentation Title Analysis of the Stability of Interfaces Fabricated Using Solid State Welds
Author(s) Niyanth Sridharan, Maxim Gussev, Chad Parish, Juan Carlos Idrobo Tapia, Kurt A Terrani, Sudarsanam Suresh Babu
On-Site Speaker (Planned) Niyanth Sridharan
Abstract Scope Components fabricated using ultrasonic additive manufacturing (UAM) suffer from reduced ductility along the z-axis. Recent work has demonstrated the improvement of the z-axis properties after post-processing treatments. However the abnormally high stability of the interfaces during post weld heat treatments and the associated increases in strength are not well understood. We use atomic scale resolution to characterize these interfaces. HRTEM/EELS show local enrichment of oxygen (possibly from the surface oxide) in the grain boundaries near the interfaces. To account for the stability of the grains two hypothesis are proposed and evaluated; viz. highly non equilibrium nano dispersed oxides impeding the grain growth due to grain boundary pinning, or segregation of O resulting from the decomposition of the oxide film during processing.
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?
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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