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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Alloy Behavior and Design Across Length-Scales: An SMD Symposium Honoring Easo George
Presentation Title Deformation Mechanisms in Compositionally Complex Polycrystalline CoNiCr-based Superalloys
Author(s) Steffen Neumeier, Andreas Bezold, Mathias Goeken
On-Site Speaker (Planned) Steffen Neumeier
Abstract Scope To improve the mechanical properties for high temperature applications of fcc medium-/high-entropy alloys (MEA/HEA) based on CoNiCr, compositionally complex alloys have been developed that are additionally strengthened with L12 structured precipitates. In this work, deformation mechanism maps are presented for such polycrystalline CoNiCr-based superalloys with high precipitate fractions. Despite their chemical differences, the dominant deformation mechanism in all four investigated alloys transitions from shearing by APB-coupled dislocation pairs to shearing under superlattice stacking fault formation with increasing temperatures and/or decreasing strain-rate. However, the regions of the dominant deformation mechanism varies between the different alloys. Additionally, microtwinning is observed at even higher temperatures and/or lower strain-rates but only in the alloys, in which Al and W are substituted for Ti and Ta. Accordingly, the influence of segregation processes and the role of small compositional changes on the occurring deformation mechanisms are discussed and potential guidelines for future alloy design are given.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, High-Entropy Alloys, Mechanical Properties


Ambient-temperature Plasticity of Brittle Intermetallics at Micron-meter Size Scales
Challenges in the Design of Refractory Multi-principal Element Alloys
Deformation Mechanisms in Compositionally Complex Polycrystalline CoNiCr-based Superalloys
Deformation Twinning in HCP Ti: The Role of Interfacial Complexions and Interstitial Solutes
Easo George – Advancing Understanding of Mechanical Behavior through Test Material Preparation
Easo George - Recollections of His Youth
Factors Affecting Mechanical Twinning in Single-phase FCC and Polycrystalline MEAs and HEAs
Fracture Properties of High-entropy Alloys
From Superplasticity in Steels to the Great Pyramid of Giza
Functional High Entropy Alloys
Future Prospects of MoSiBTiC Alloys as Ultra-High Temperature Materials
Heat-Resistant Cr-Alloys, Microstructure, Oxidation and Creep
Low Temperature Deformation Mechanisms of CrMnFeCoNi High-entropy Alloy Polycrystals
Physical Metallurgy and Mechanical Properties of Iridium and Platinum Alloys Used in Power and Heat Sources Onboard Interplanetary Spacecraft
Predicting High Entropy Alloy Phase Stability across Length Scales
Solid Solution Hardening Effects on Thermal Stability and Mechanical Properties of Nanostructured Ni-enriched CrMnFeCoNi High Entropy Alloys
Some Unusual Aspects of the Deformation Behavior of FeAl
Strong Effects of Tiny Compositional Changes on Structural and Functional Material Properties
The Interplay between Phase Transformation and Mechanical Properties in High Entropy Alloys
Theory-guided Design of High-strength, Ductile, Single-phase BCC High Entropy Alloys
Utilizing Nanoprecipitates to Modulate Phase Transformation, Strength, and Ductility of HEAs

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