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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Phase Stability in Extreme Environments II
Presentation Title Microstructural Evolution and Hardness Changes in Ion Irradiated Ni-based Superalloys
Author(s) Qinyun Chen, Siwei Chen, Yan-Ru Lin, Yajie Zhao, Ryan Thier, Steven Zinkle
On-Site Speaker (Planned) Qinyun Chen
Abstract Scope Nickel-based superalloys are promising structural material candidates for molten salt reactors and other advanced nuclear reactors. However, traditional Ni alloys exhibit severe mechanical degradation after neutron irradiation, and the gamma-prime precipitates in these alloys are susceptible to dissolution during irradiation. Several high-performance commercial Ni-base superalloys (solid solution-strengthened Haynes 244 and Haynes 214, precipitation-strengthened Haynes 244) were irradiated with 8 MeV Ni ions to midrange doses of 1 and 10 dpa at 600 ℃ and 750 ℃. During 750℃ irradiation to 10 dpa, the Ni2(Mo,Cr) precipitates in aged Haynes 244 exhibited remarkable stability. However, such precipitates were partially dissolved in the 600 ℃ samples. The post-irradiation nanoindentation analysis revealed significant hardening for both solution-annealed Haynes 214 and Haynes 244. TEM analysis confirmed Ni2(Mo,Cr) precipitates in irradiated regions. In addition to gamma-prime precipitates, an unidentified radiation-induced/modified phase was observed in Haynes 214. Detailed chemical composition from STEM-EDX and APT will be summarized.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Nuclear Materials,


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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