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Meeting 2014 TMS Annual Meeting & Exhibition
Symposium High-temperature Gamma (f.c.c.) /Gamma-Prime (L12 structure) Co-Al-W Based Superalloys 2014
Sponsorship TMS Structural Materials Division
TMS: High Temperature Alloys Committee
David C Dunand, Northwestern University
Chantal K Sudbrack, NASA Glenn Research Center
Carelyn E Campbell, National Institute of Standards and Technology
Ursula R Kattner, National Institute of Standards and Technology
David Dye, Imperial College
Scope Nickel-base superalloys owe their excellent strength at elevated temperatures to their two-phase gamma/gamma-prime microstructure: coherent gamma(L12) Ni3Al-based precipitates in a disordered gammaf.c.c) Ni-Al based matrix. It was believed that analogous Co-based gamma/gamma-prime structures did not exist, thus relegating Co-base alloys to applications at moderate temperatures and stresses. In 2006, Sato et al. (Science) discovered in the Co-Al-W ternary system a gamma(f.c.c.)/gamma-prime (L12) microstructure analogous to that of Ni-based superalloys, but with significantly higher solidus temperature temperatures than Ni-based gamma/gamma-prime alloys. Sato et al.’s Co-Al-W phase diagram shows that at 900 C the gamma/gamma-prime two-phase region is significantly narrower than in the Ni-Cr-Al phase diagram. High temperature flow-stress and creep measurements of the gamma/gamma-prime Co-Al-W superalloys with quaternary and higher alloying additions demonstrate promise for continued development for high-temperature applications. This symposium’s purpose is to assemble all researchers working on Co-Al-W based alloys and to ascertain the state-of-the-art concerning these alloys while gaining a better understanding where this research is heading. Areas of focus would include experimental and computational work in alloy development, phase stability and evolution, mechanical and damage behavior, environmental resistance and protection, all of which are imperative to their high temperature use.
Abstracts Due 07/15/2013
Proceedings Plan Planned: A print-only volume

A Many Fold Way to Model the Thermodynamics of Co-Al-W
Alloying Effects on the Matrix-precipitate Interface Width in Co-Al-W Base Superalloys.
APB Energetics of Co3(Al,W) L12 γ’
Atomic Scale Observation of the Structure and Composition of Order/Disorder Gamma Prime/Gamma Interfaces in Cobalt-base Superalloys
B and Zr Additions as Grain Boundary Strengtheners in a Model Co-based Superalloy
Co-Al-W Superalloys, Interface Width and Dislocations
Coarsening Kinetics of γ' Precipitates in Cobalt-base Alloys
Creep Deformation Mechanisms in L12-Containing Co-Al-W-base Superalloys
Creep Properties and Segregation Behavior of γ'-Strengthened Co-base Superalloys
Effect of Ti and Ta on the Creep Properties of Single Crystal Co-Al-W-base Superalloys
Elementary Processes during the Oxidation of Ternary Co-base Superalloys
From Ni- to Co-based Superalloys: γ' Phase Stability and Superlattice Stacking Fault Energies
High Temperature Oxidation of New γ/γ′ Co–Al–W Based Superalloys
High Temperature Properties of Single Crystal Cobalt -base Alloys
Interdiffusion and Atomic Mobility in f.c.c Co-Al Based Ternary Alloys
Mechanical Properties of Co-based Superalloys with L12 Cuboidal Precipitates
Microstructure and Mechanical Behavior of a High-temperature Co-Al-W-Ti-B Superalloy
On the Role of Alloying Composition and Processing Parameters in Co-Base γ – γ' Composites
Phase Equilibria in the Ternary Co-W-Al Alloy System
Physical Metallurgy and Creep Behaviour of Some Candidate Co-base Superalloys
Recent Progress in Co-Base Superalloy
Stability of TCP Phases in Co-based Superalloys: Comparison of Ab Initio Results with Structure Maps
The Effect of Quaternary Alloying Additions on Diffusivity in the Co-Al-W System
The Effect of Rhenium in Co-base Superalloys – A Comparison with Ni-base Superalloys
The Influence of Boron and Carbon on Grain Boundary Strength of γ'-Hardened Co-base Superalloys
Thermodynamic Database for High Temperature Co-based Superalloys

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