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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Phase Transformation Across Multiscale Material Interfaces
Presentation Title Atom Probe Tomography Study of Interface Diffusion Assisted Self-healing Behaviour of Cr2Al(Si)C MAX Phase Coatings
Author(s) Pradeep Konda Gokuldoss
On-Site Speaker (Planned) Pradeep Konda Gokuldoss
Abstract Scope Cr2AlC is a ternary compound belonging to the group of Mn+1AXn phases which exhibit unique nanolayered microstructure consisting of Cr2C layers interleaved with elemental Al. By tailoring the composition such MAX phase coatings can also be used for self-healing purposes wherein an in-situ Al2O3 layer forms along cracks upon oxidation at high temperatures (eg. 1100 C) there by preventing further crack propagation. In this work, we investigate the effect of Si addition on the phase formation, oxidation behaviour of Cr2AlC MAX phase coating using combined TEM, TKD imaging and APT. Results reveal that Al atoms diffuse along the columnar grain boundaries during oxidation resulting in the formation of stable Al2O3 layer along the exposed surface. The atomic-scale mechanism behind the grain refinement effect of Si combined with successive phase transformation of the MAX phase and the elemental diffusion along the columnar grain boundaries across different layers will be presented.
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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