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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
Presentation Title Phase Equilibria in the Ternary Co-W-Al Alloy System
Author(s) Eric Andrew Lass
On-Site Speaker (Planned) Eric Andrew Lass
Abstract Scope Two-phase gamma (FCC)-gamma’ (L12) alloys based on the Co-W-Al ternary system exhibit promising high temperature strength and creep resistance; and could potentially operate at higher temperatures compared to their Ni-based analogs presently used in turbine blade and other high temperature applications. Unfortunately, the understanding of the thermodynamics and kinetics of ternary Co-W-Al is incomplete. In this work, microstructure and phase evolution is investigated for several rapidly quenched Co-W-Al alloys at temperatures between 800 C and 1100 C from the as-quenched state to annealing times up to 4000 hr. Phase equilibria, including the stability of the L12 phase in the ternary system, are discussed in detail and isothermal sections of the Co-rich portion of phase diagram are presented for several temperatures. The new data are incorporated in an updated CALPHAD description of the Co-W-Al system.
Proceedings Inclusion? Planned: A print-only volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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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