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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys II
Presentation Title A High-throughput Search for New Ternary Superalloys
Author(s) Chandramouli Nyshadham, Corey Oses, Jocob Hansen, Ichiro Takeuchi, Stefano Curtarolo, Gus Hart
On-Site Speaker (Planned) Chandramouli Nyshadham
Abstract Scope In 2006, a novel cobalt-based superalloy was discovered[1]. Inspired by this unexpected discovery, we performed a first-principles search through 2224 ternary metallic systems of the form X<SUB>3</SUB>[A<SUB>0.5</SUB>, B<SUB>0.5</SUB>], where X = Ni, Co, or Fe, and [A, B] = metals. We found 115 systems that have a smaller decomposition energy and a lower formation enthalpy than the Co<SUB>3</SUB>(Al, W) superalloy. They have a stable two-phase equilibrium with the host matrix within the concentration range 0<<I> x </I><1 (X<SUB>3</SUB>[A<SUB><I>x</I></SUB>, B<SUB>1-<I>x</I></SUB>]) and have a relative lattice mismatch with the host matrix of less than 7%. These new candidates, narrowed from thousands of possibilities, suggest experimental exploration for new superalloys. Of these 115 systems, 42 have no reported phase diagrams. Based on cost, experimental difficulty, and toxicity, we list[2] the top 10 candidates for further study. [1] Sato et al., Science 2006; 312 (5770):90-1. [2] Nyshadham et al., arXiv:1603.05967 (2016).
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A High-throughput Search for New Ternary Superalloys
An Update on Cobalt Based Co-Mo-Al –X Alloys with γ-γ’ Microstructure: Effect of Alloying Additions, Mechanical Properties and Interaction with Different Environments
Analyzing the Tension/Compression Asymmetry in Creep Deformed Single Crystal Co-base Superalloys
Calphad Design of Co-based Gamma-prime-strengthened Superalloys
Coarsening Kinetics and Elemental Partitioning of (f.c.c.) Gamma Plus (L12) Gamma-prime-strengthened Co-base Superalloys
Coating Systems for New Cobalt Base Single Crystals
Creep Behavior in a γ′ Strengthened Co-Al-W-base Single Crystal Superalloys
Deformation Microstructures of L12 Ordered Intermetallic Phases in Ni-, Co- and Co-Ni-base Superalloys
Developing Polycrystalline Ni-Co Rich Alloys, Strengthened by Co3AlW L12 Gamma Prime Precipitates for High Temperature Applications
Dislocation Interactions during High-temperature Creep and Yield of Polycrystalline Co-Ni-Al-W-based Superalloys and L12 γ’ Phases
Double Minimum Creep of a Ta-containing Single Crystal Co-base Superalloy
Elemental Partitioning Behaviour in Ni-Co-Al-Ti-Cr Alloys
Gammaprime Precipitation in Model CoAlW Alloys
Influence of Alloy Composition on Oxide Scale Formation in Novel Co-Based γ-γ’ Superalloys
Influence of Replacement of Ta by Nb in a γ/γʹ- structure Co Base Superalloys
Integrated Computational Materials Engineering of Co Bushing Alloy
Load Transfer between Phases during Deformation of Superalloys
Mechanical Behavior of Polycrystalline (L12)gamma-prime-strengthened Co-base Superalloys
Mechanical Properties of Co-based Superalloys with FCC+L12 Two-phase Microstructures
Modeling Precipitate Coarsening in Cobalt-based Superalloys
Multi-scale Modelling of High-temperature Deformation Mechanisms in Co-Al-W-based Superalloys
Novel Cast and Wrought γ/γ’ Cobalt Base Superalloys - Creep Properties, Deformation Mechanisms, and Oxidation
On the Role of the Base Elements Co and Ni in γ'-hardened Superalloys
Phase Stability, Element Partitioning and Atomic Site Location in Co-9Al-9W-2X Alloys
Planar Defect Formation in the γ' Phase during High Temperature Creep in Single Crystal CoNi-base Superalloys
Properties of γ'-phase in L12-precipitation Hardened Co-base Alloys with Different W-content
Role of Two Phase Microstructure during Early Stages of High Temperature Oxidation of Co-base Superalloys
Solid Solution Strengthening of Co3(Al, TM) L12 Phase: An Integrated First-principles Calculations and Experimental Study
Solute-vacancy Binding Energies and Diffusion Rates in fcc Cobalt: A First-principles Database
Structural Stability of L12 and TCP Phases in Co-based Superalloys
Superlattice Intrinsic Stacking Fault Energies and Solute Segregation to Planar Defects in Co-based Superalloys
Supersolvus Thermomechanical Processing of Cast Co–Base Superalloys
The Grain Boundary Pinning Effect of the μ-phase in Polycrystalline L12 Hardened Co-base Superalloys
The Influence of Cr in γ' Strengthened Co-base Superalloys
The Microstructure and Hardness of Ni-Co-Al-Ti-Cr Quinary Alloys
Thermodynamic Database for the Co-Al-W-Ni-Ti-Ta-Cr Superalloy System
Thermodynamics and Kinetics of L12-containing Co-base Superalloys from First-Principles
γ’-strengthened Co-Base Alloys – Development and Challenges

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