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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Phase Stability in Extreme Environments II
Presentation Title Metastability-driven design of AM Al-based Superalloys
Author(s) Ying Yang, A. Plowkowski, Ke An, Alice E. Perrin, W. Zhong, Q. Ren, Indranil Roy, Yury Osetskiy
On-Site Speaker (Planned) Ying Yang
Abstract Scope Lightweight but strong materials offer great potential for increasing vehicle fuel efficiency while maintaining safety and performance. Forming dispersive tri-aluminide nanoprecipitates in a ductile Al FCC matrix is desirable to achieve excellent mechanical properties in light-weight Al alloys. However, to form a high-volume fraction of such precipitates with the desirable size, number density and distribution remains a challenge. In this work, the relative stability of the different tri-aluminide (Al3M) structures (such as L12, DO22, DO23) in Al-Zr and Al-Nb systems was assessed for their potential to form nanoscale cubic L12 precipitates in additively manufactured (laser powder bed fusion) alloys. SEM, TEM and APT were used to characterize the microstructure and the results show that the metastable L12 structure is highly competitive with the stable DO23 structure in the Al-Zr system, but much less stable than the DO22 structure in the Al-Nb system. The experimental results are in good agreement with the DFT and kinetic calculations. In-situ tensile test under neutron diffraction was used to study the mechanical behaviors and deformation mechanisms. Both alloys demonstrated a good combination tensile strength and elongation. This work provided a promising strategy for developing high strength Al alloys strengthened by a high-volume fraction nanoscale trialumides via additive manufacturing.
Proceedings Inclusion? Planned:


Advanced Manufacturing and Sensor Integration for Smart Sensing on Nuclear Packages
Atomic-scale Understanding of the Hydrogen Embrittlement Mechanism in Model and Commercial Austenitic Steels Using Cryogenic Transfer Atom Probe Tomography
Behavior of Tritium Breeder Ceramics under Ion Irradiation
Degradation Mechanisms of Steels and Ni-based Alloys in Hydrogen/Water Vapor High Temperature Environments
Development of Novel Intermetallic Dispersion Strengthened Steels
Effect of Damage, Temperature, and Helium on Irradiated Nanoprecipitation in Advanced Ferritic/Martensitic (F/M) Fe9Cr Steel
Effect of Hydrogen on the Phase Stability of Steels
Effect of Surface Orientation on the Oxidation of Ni-based Single-crystal Superalloys Using Ab Initio Simulations
Effects of Microstructural Variance on Edge Dislocation Mobility and Pinning in Nickel Superalloys at High Temperatures
Exceptional Fatigue Strength of a Microstructurally Stable Bulk Nanocrystalline Alloy
Exploring and Quantifying Degradation Mechanisms in Irradiated Structural Materials
Frictional Ignition of Dispersion-strengthened Ni-base Superalloys in High Pressure Oxygen Environments
Impact of Build/Print Variations on Steam Oxidation Performance of 316L Stainless Steel
Improving Radiation Resistance in Metal Alloys via the Use of Multiple Synergistic Solutes
Investigating the Coupling between Short-range Order and Radiation Damage in Multi-component Alloys
Metastability-driven design of AM Al-based Superalloys
Microstructural Evolution and Hardness Changes in Ion Irradiated Ni-based Superalloys
Microstructure Evolution in Cr0.5FeNiMn and CrFeNiCoPd0.75 Alloys under Ion Irradiation
Non-ideality of Hydrogen Isotope Permeation in Metals & Alloys
Phase-field-informed Crystal-plasticity Modeling of 3D γ’ Rafting in Ni-based Single-crystal Superalloys
Precipitate Evolution and Stability in Superalloy 718 Following HFIR Irradiation or Thermal Aging
Radiation-induced Partial Disordering of Heusler Phase in Intermetallic Dispersion Strengthened Ferritic Superalloys
Stability of Hydrogen/Helium-filled Nanocavities in Structural Alloys after Low Temperature Irradiation with Simultaneous High Energy Protons and Spallation Neutron
Stability of Nanoporous Ultra-High Temperature Ceramics at High Temperatures
Superior Radiation Resistance and Structural Stability in Nanotwinned High Entropy Thin Film under Extreme Radiation Damage
The Effect of Alloying Elements and Atmosphere on the Oxidation of NiCr Model Alloys
The Less Understood Impact of Environmental Degradation on Phase Stabilities in High Temperature Alloys

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