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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Phase Transformation Across Multiscale Material Interfaces
Presentation Title Prevention of Coarsening Induced Phase Transformations in Al-Cu Alloys: Role of Interfaces
Author(s) Amit Shyam, Dongwon Shin, Yukinori Yamamoto, Patrick Shower, Brian Milligan, James Morris, Lawrence Allard, Jonathan Poplawsky, Juan Idrobo, German Samolyuk, James A Haynes
On-Site Speaker (Planned) Amit Shyam
Abstract Scope This presentation will focus on the role of interfacial structure and chemistry in preventing detrimental phase transformations in Al-Cu alloys. The differences between the structure of coherent and semi-coherent interfaces in the metastable theta prime (Al2Cu) precipitates will be highlighted. Further, it will be demonstrated that the difference in the solute segregation profiles for these two kinds of interfaces have a strong bearing on the coarsening resistance of Al-Cu type alloys. First principles calculations for segregation of multiple solutes of interest on the relevant interfaces support the role of microalloying elements in determining the elevated temperature stability of Al-Cu alloys. Finally, results from a phase field modeling effort to delineate the thermodynamic and kinetic factors that determine the elevated temperature stability of theta prime precipitates will be summarized. Research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory.
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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