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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Phase Stability in Extreme Environments II
Presentation Title Radiation-induced Partial Disordering of Heusler Phase in Intermetallic Dispersion Strengthened Ferritic Superalloys
Author(s) Kan Ma, Robert Abernethy, Sophia von Tiedemann, Nianhua Peng, Graeme Greaves, Anamul H Mir, Christina Hofer, Thomas W Pfeifer6, Kai Sun, Lumin Wang, Pedro A Ferreirós, Christopher D Hardie, Alexander Knowles
On-Site Speaker (Planned) Kan Ma
Abstract Scope Advanced steels strengthened by intermetallics have been in rapid development in the last decade. Mirroring to Ni superalloys, a new class of ferritic steels, ferritic “bcc-superalloys”, have been designed comprising a disordered body-centred cubic (bcc) matrix reinforced by ordered-bcc intermetallics, such as B2-NiAl and L21-Ni2AlTi. The A2-B2/L21 microstructure meets strategies to create radiation-tolerant materials: utilising a radiation-resistant body-centred cubic (bcc) matrix and a large interface area as sinks for point defects. However, their irradiation behaviour is still rarely known. This work addresses novel ferritic superalloys FeNiAlTi, comprising nanoscale L21 precipitates with various sink strengths. Ex-situ irradiation with Fe+ ions at 300°C was performed followed by nano-indentations to study the radiation-induced hardening. Transmission electron microscopy and atom probe tomography were conducted to study the irradiated microstructure. A partial disordering of the L21 phase into a B2 phase was revealed. In-situ experiments showed that the disordering depends on the temperature and dose.
Proceedings Inclusion? Planned:
Keywords Iron and Steel, Characterization, Phase Transformations


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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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