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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys II
Presentation Title Developing Polycrystalline Ni-Co Rich Alloys, Strengthened by Co3AlW L12 Gamma Prime Precipitates for High Temperature Applications
Author(s) David Dye, Farah Ismail, Trevor C Lindley, Paul Mulvey, Richard Chater, Ioannis Bantounas, Barbara A Shollock, Mark C Hardy
On-Site Speaker (Planned) David Dye
Abstract Scope Since Sato et al reported the occurrence of a stable L12 phase (Co3AlW) in the Co-Al-W ternary system, there has been considerable interest in developing Co-based alloys for high temperature applications. Much activity has focused on single crystal aerofoil alloys, given the high melting temperatures and their reduced elemental segregation, which potentially reduces convective instabilities and therefore, freckle formation. The low solvus temperature has required significant Ni, Al, Ta and Ti additions, suggesting a potential for lower temperature polycrystalline applications. This presentation considers the design and manufacturing requirements for Ni-Co rich polycrystalline alloys in static and rotating applications, provides some insights from current research and suggests areas for future study. Given the temperature requirements, oxidation will be a particular concern, particularly in the context of fatigue, and therefore alloying effects on oxidation will be a particular focus. We acknowledge the EPSRC/Rolls-Royce Strategic Partnership for funding (EP/M005607/1, EP/H022309/1).
Proceedings Inclusion? Undecided


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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