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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Metastable Phases and Phase Equilibria: Towards Designing the Next Generation of Alloys
Presentation Title Harnessing the Stability of 𝜃ʹ-Al2Cu at Unprecedented High Temperatures
Author(s) Dongwon Shin, Amit Shyam, Larry F. Allard, Matthew F. Chisholm, Jon Poplawsky, J. Allen Haynes
On-Site Speaker (Planned) Dongwon Shin
Abstract Scope Oak Ridge National Laboratory recently developed a family of cast Al-Cu alloys that can withstand up to 350°C (>200 hours) without appreciably losing mechanical strength. Extensive characterization has revealed that engineering the Al/𝜃′-Al2Cu interface via microalloying is the key to stabilizing this metastable strengthening phase at unprecedented high-temperatures. Inspired by this stimulating observation, we have performed massively parallelized first-principles density functional theory calculations (DFT) with modern supercomputing to further investigate the underlying mechanism. We present DFT databases of solute segregation energy at the interface between the aluminum matrix and 𝜃′-Al2Cu, and partitioning of solutes within 𝜃′. We also report Al/𝜃′ interfacial energies at under-investigated orientation obtained from DFT calculations of the experimentally observed structures. The research was sponsored by the LDRD Program of Oak Ridge National Laboratory and the Department of Energy, Vehicle Technologies Office, Propulsion Materials Program.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Composition, Processing, and Property Relationships in Fe and Al Modified Ti-12Cr Alloys
Deformation Mechanisms in Metastable Fcc Alloys
Deformation Mode, Strain Path, and Strain Rate Effects on Austenite to Martensite Transformation in Gen 3 Steels
Exploration of Nano-scaled Metastable Phases in Metastable Beta Titanium Alloys Using Advanced Electron Microscopy and Atom Probe Tomography
Formation of Metastable Spiral Patterns during Directional Eutectic Solidification
Harnessing the Stability of 𝜃ʹ-Al2Cu at Unprecedented High Temperatures
Modeling of Metastable Phase Formation for Sputtered Ti1-xAlxN Thin Films
New Strain-transformable Titanium Alloys Displaying Unprecedented Combination of Mechanical Properties: from Design Approaches to Deformation Mechanisms
Precipitation Kinetics and Mechanical Behavior of Oxygen-stabilized Metastable Beta Ti-Nb Alloys
Pseudo-in situ Characterization of Phase Transformation in an Al-Cu-Mn-Zr Alloy using Atom Probe Tomography
Resetting Mechanical Property of 9Cr Steel by Segregation Engineering
Shape Memory Response of High Temperature NiTiHfPd
The Intrinsic Coupling Between Twinning Plasticity and Transformation Plasticity in Metastable β Titanium Alloys
Thermal Decomposition of Quasicrystals in Powder-processed Icosahedral-phase-strengthened Aluminum Alloys
Towards Work-hardenability of Ti-6Al-4V Through a Quenching and Partitioning Approach
Tuning Strength in TRIP Titanium alloys

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