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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 APB Energetics of Co3(Al,W) L12 γ’
Author(s) James Saal, Chris Wolverton
On-Site Speaker (Planned) James Saal
Abstract Scope With the discovery of Co-based superalloys exhibiting γ/γ’ morphologies, a flurry of research has been performed to determine their high-temperature strength and the effect of alloying on γ’ phase stability. However, fundamental properties for the base Co<SUB>3</SUB>(Al,W) L1<SUB>2</SUB> γ’ remain unknown. We have previously explored with DFT the stability of γ’ and found that at low temperatures, γ’ is a thermodynamically metastable phase. At higher temperatures, entropy-driven effects may potentially stabilize the structure. We have now performed DFT calculations on a fundamental thermodynamic quantity that influences the high-temperature yield strength anomaly, the antiphase boundary (APB) energy. The 100 and 111 APB energies are predicted for Co<SUB>3</SUB>(Al,W) L1<SUB>2</SUB> γ’ and some observations are made as to the unique nature of Co<SUB>3</SUB>(Al,W) L1<SUB>2</SUB> compared to the more commonly studied Ni<SUB>3</SUB>Al. We also predict the effect of a variety of solutes on APB energetics.
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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