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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 High Temperature Deformation Pathways in Ordered L12- and Immm-based Compounds
Author(s) Thomas Mann, Dongsheng Wen, Sae Matsunaga, Marisol Koslowski, Michael G. Fahrmann, Michael S. Titus
On-Site Speaker (Planned) Michael S. Titus
Abstract Scope Ordered intermetallic compounds exhibit complex deformation pathways that depend on their thermo-physical properties. In this presentation, we will first elucidate the role of symmetry and planar defect energies on the theoretical shear strength of γ’’’-Immm Ni2(Cr,Mo,W) precipitates in HAYNES® 244®. We have found that both low- and high-energy deformation pathways exist in the γ’’’ phase utilizing first-principles calculations, a continuum Peierls-Nabarro model, and phase field dislocation dynamics. Preliminary experimental evidence of deformation at elevated temperature suggests that microtwinning is enabled by the energetic disparity in these pathways. Next, we will report on recent efforts to predict and quantify solute segregation in γ’-strengthened NiCo-based alloys using a combination of first-principles calculations and high-resolution transmission electron microscopy. We have observed that segregated stacking fault energies in NiCo-based alloys can be significantly reduced when Co partitions to the stacking faults. The effects on mechanical properties resulting from solute segregation will be further discussed.
Proceedings Inclusion? Planned:


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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