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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Microstructural Templates Consisting of Isostructural Ordered Precipitate / Disordered Matrix Combinations: Microstructural Evolution and Properties
Presentation Title Investigation of Nucleation Mechanisms Associated with the Formation of Coprecipitates in Ni-based Superalloys
Author(s) Hariharan Sriram, Semanti Mukhopadhyay, Michael Mills, Yunzhi Wang
On-Site Speaker (Planned) Hariharan Sriram
Abstract Scope Experimental studies have shown a wide variety of γ'/γ” coprecipitates in IN718-based alloys. Although the coprecipitate's growth and coarsening mechanisms have been investigated, the heterogeneous nucleation mechanisms of γ” on existing γ' that lead to different types of coprecipitates are yet to be understood. We analyze the individual and combined effects of concentration field and coherency elastic stress field associated with existing γ' at different sizes on nucleation of γ". The chemical driving force for nucleation is calculated using the CALPHAD databases, while the contributions from elastic interaction and anisotropic interfacial energies between different interfaces are quantified by comparing results from phase-field simulation and experimental characterization. Subsequently, an explicit nucleation algorithm is used in phase-field simulations to study nucleation and early stage of growth. Furthermore, insights gained from the analysis will be used as inputs in fast-acting precipitation models to design heat treatments for the coprecipitate alloys.
Proceedings Inclusion? Planned:
Keywords Modeling and Simulation, Phase Transformations, High-Temperature Materials

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Bcc-Superalloys Microstructure Templates: Tungsten to Titanium to Iron
Comparison of γ' and B2 Precipitates and Their Influence on the Mechanical Behavior of FeNiCoAl-based High-entropy Alloys
Core/Triple Shell Precipitates in Al-Er-Sc-Zr-(V,Nb,Ta) Alloys
Deformable Intermetallic Nanorods Leads to an Excellent Strength-ductility Combination in a High Entropy Alloy
Design of Precipitation Strengthened Metastable High Entropy Alloys
Free Energy Landscape, Transformation Pathway and Alloy Parameters Leading to Various Isostructural Ordered Precipitate Microstructures
High Temperature Deformation Pathways in Ordered L12- and Immm-based Compounds
Investigation of Nucleation Mechanisms Associated with the Formation of Coprecipitates in Ni-based Superalloys
Microstructural Engineering in NiCoCr Medium Entropy Alloys
Novel Nickel-based Alloys for High Temperature Structural Applications
On the Detailed Morphological and Chemical Evolution of Phases during Laser Powder Bed Fusion and Common Post-processing Heat Treatments of IN718
Optimizing Composition and Microstructure in Compositionally Complex Alloys Possessing bcc and B2 Mixtures
Precipitate Strengthening and Stabilization Mechanisms in Cast and Additively Manufactured Al-Cu-Mn-Zr Alloys
Precipitation of Ordered B2 Precipitates in BCC Al2.7CrMnTiV High-entropy Alloys
Seeing the Shearing of Short-range Order with Dislocations in the High-entropy Alloy
The Microstructural Design and Thermomechanical Processing of Compositionally Complex Alloys
The Origin and Stability of Nanostructural Hierarchy in Nickel-base Superalloys
The Role of Precipitate Size Distribution and Morphology on Ni Superalloy Deformation Micromechanisms
Tuning the Degree of Chemical Ordering in the Solid Solution of a Complex Concentrated Alloy and Its Impact on Mechanical Properties
Understanding the Role of Chemistry on Planar Fault Energies in A3B Compositions

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