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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Phase Transformation Across Multiscale Material Interfaces
Presentation Title The Effect of Diffusion on the Microstructure and Properties of a NiAl-based Anchor Phase Coating for CMSX-4
Author(s) Megan McGregor, Matthew Hancock, Lloyd Pallett, William Clegg
On-Site Speaker (Planned) Megan McGregor
Abstract Scope Limiting leakage of gas from the flow path in a gas turbine is critical for maximising efficiency. One solution is to tip shroudless turbine blades with a surface treatment of abrasive particles held in an anchor phase that cuts into abradable material on the static counter face. However, current anchor phase materials are often too weak to retain the abrasive particles under abrasion. A new anchor phase system, NiAl strengthened with a reinforcing Laves phase, NiTaAl, has been identified. The interactions between Ni<SUB>45.3</SUB>Al<SUB>44.7</SUB>Ta<SUB>10</SUB> and a turbine blade material, CMSX-4, have been investigated at operational temperatures using a diffusion couple method, and the observed microstructural changes compared with predictions calculated using DICTRA. High temperature pin-on-disc abrasion tests have been used to characterise how the microstructural changes affect the abrasion performance of the anchor phase over the tip lifetime, and to assess the suitability of this material in such a demanding application.
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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