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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 Twinning in HCP Ti: The Role of Interfacial Complexions and Interstitial Solutes
Author(s) Mohammad S. Hooshmand, Buyu Zhang, Enze Chen, Timofey Frolov, Ruopeng Zhang, Yan Chong, Andrew M. Minor, Mark D. Asta
On-Site Speaker (Planned) Mark D. Asta
Abstract Scope At cryogenic temperatures, hexagonal-close-packed (HCP) Ti has been observed to undergo a brittle-ductile transition when interstitial oxygen solute concentration is increased beyond a certain threshold. This observation has been linked to the a twinning mode that is not commonly observed in HCP Ti alloys. The relevant twin boundaries associated with this deformation twinning mode are observed in electron microscopy and first-principles calculations to display a novel interfacial structure (complexion) linked to a metastable polymorph in Ti. We discuss the energetic origins of this complexion and how it influences the interactions of the twin with oxygen solutes. By drawing comparisons to previous related research related to oxygen-solute interactions with more common twinning modes, we discuss mechanisms by which oxygen can alter the selection of twinning modes favorable for growth. Implications of the work for alloy design in Ti and other related materials will be discussed.
Proceedings Inclusion? Planned:


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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