Article
Materials Science, Multidisciplinary
Sudip Kumar Sarkar, Deodatta Shinde, Debasis Sen, Aniruddha Biswas
Summary: This study presents an effective combinatorial approach utilizing atom probe tomography, small angle neutron scattering, and transmission electron microscopy to quantitatively analyze nano-sized Cr-rich precipitates in Fe-20at% Cr alloy. By leveraging the strengths of each technique, the accuracy of quantitative precipitation analysis is significantly improved, providing a true representation of the microstructure.
MICROSCOPY AND MICROANALYSIS
(2022)
Article
Nanoscience & Nanotechnology
N. J. Aerne, D. J. Sprouster, J. D. Tucker
Summary: The precipitation of new phases during long-term service at elevated temperatures is a concern for the thermal stability of engineering alloys. In this study, the formation and evolution of Ni2Cr precipitation in Ni-Cr-Fe model alloys with different Fe contents and Ni/Cr atomic ratios were quantified. The impact of precipitate size on the mechanical properties as a function of Fe content was also investigated. The results showed that Ni2Cr formation was observed in certain Fe-containing alloys, and the face-centered cubic matrix lattice contraction and Vickers hardness were correlated with the Ni2Cr formation. A precipitation hardening model was developed based on critical resolved shear stress, showing a clear link between Ni2Cr precipitate size and hardness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Kanghyun Park, Byungchan Cho, Soon Jik Hong, Ka Ram Lim, Chanho Lee, Gian Song
Summary: We designed and developed a novel ferritic alloy that exhibits excellent high-temperature yield strength enhancement through coherent hierarchical precipitates. The composition of the alloy was tailored by adding Vanadium to a Fe-Cr-Ni-Al alloy to control the size and volume fractions of coherent B2-NiAl precipitates. Experimental and theoretical approaches were used to examine the evolutions of microstructures, mechanical properties, and strengthening mechanisms at 973 K. It was found that the addition of Vanadium reduces the lattice misfit and precipitate size, and a hierarchical structure within the precipitate plays a vital role in enhancing the yield strength at 973 K.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Mark Fedorov, Jan S. Wrobel, Andrew J. London, Krzysztof J. Kurzydlowski, Chu-Chun Fu, Tonci Tadic, Sergei L. Dudarev, Duc Nguyen-Manh
Summary: Using exchange Monte Carlo (MC) simulations based on an ab initio-parameterized Cluster Expansion (CE) model, the phase stability of low-Cr Fe-Cr alloys was explored as a function of vacancy (Vac), carbon, and nitrogen content. It was found that the addition of a small amount of C or N in an alloy without vacancies resulted in the formation of ordered compounds containing high amounts of Cr, C, and N. Cr segregated to interstitial atoms and the concentration of Cr in Cr-rich clusters increased with the concentration of C and/or N. In the presence of vacancies, C and N aggregate to the core regions of vacancy clusters, reducing the segregation of Cr-rich clusters. The structure of Cr-rich clusters varied depending on the concentration of interstitial atoms and the ratio of N to C. The predictions derived from MC simulations were in agreement with experimental observations of Fe-Cr alloys exposed to ion irradiation.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
E. Thronsen, S. Shah, C. Hatzoglou, C. D. Marioara, S. Wenner, S. J. Andersen, B. Holmedal, R. Holmestad
Summary: The evolution of early-stage precipitates in a 7003 aluminium alloy was investigated through artificial ageing. It was found that after 10 minutes of artificial ageing, the hardness of the precipitates decreased and their size increased, indicating the dissolution of the Guinier-Preston (GP) zones. Subsequently, as the ageing time increased, the hardness gradually increased and new precipitate phases appeared. Atomically resolved scanning transmission electron microscopy images of the disputed T' phase were also presented.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Sudip Kumar Sarkar, Debes Ray, Debasis Sen, Aniruddha Biswas
Summary: This study examines and distinguishes the two different modes of alpha' phase separation in thermally aged Fe-Cr alloys using atom probe tomography (APT) and small angle neutron scattering (SANS). APT analysis determines the mode of phase separation based on chemical fluctuation and interphase interface characteristics, while SANS analysis identifies key features in the correlation peaks that can distinguish between the two modes.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Nanoscience & Nanotechnology
Hamdy Arkoub, Miaomiao Jin
Summary: Chemical short-range order (CSRO), a nanoscale atomic feature, has been shown to significantly affect defect properties and radiation behavior in Fe-Ni-Cr alloys. Molecular dynamics simulations reveal that random solutions, characterized by negative stacking fault energy, exhibit the strongest diffusion tendency, while high CSRO degrees reduce defect diffusivity due to trapping effects. In high-CSRO scenarios, interstitial clusters become Cr-rich and interstitial loops prefer Cr-rich CSRO domains. CSRO dynamically evolves during irradiation and reaches a steady-state value. These findings emphasize the importance of considering CSRO when investigating radiation-driven microstructural evolution.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Thomas Rieger, Jean-Marc Joubert, Regis Poulain, Xavier Sauvage, Elie Paccou, Loic Perriere, Ivan Guillot, Guy Dirras, Guillaume Laplanche, Mathilde Laurent-Brocq, Jean-Philippe Couzinie
Summary: This study investigates the coarsening kinetics of four complex concentrated alloys in the Al-Ti-Cr-Fe-Co-Ni system. The results show that the chemical compositions of the alloys have a significant impact on Ostwald ripening. By using atom probe tomography and thermo-kinetic modeling, the key parameters affecting ripening are identified and the corrected activation energies are in better agreement with diffusion data.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Sudip Kumar Sarkar, Aniruddha Biswas
Summary: This study quantifies the nano-scale micro-hardness and microstructural evolution of a high-Cr binary ferritic Fe-20 at.% Cr alloy during thermal aging using a combination of atom probe tomography, transmission electron microscopy, and small angle neutron scattering. It successfully estimates the mechanical response of the alloy through reliable quantification and suitable hardening models.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
R. Lawitzki, D. Beinke, D. Wang, G. Schmitz
Summary: This experimental study focuses on the characterization of hyperfine NiAltype precipitates in ferritic superalloys, with electron microscopy and atom probe tomography used to obtain size, crystallographic information, and chemical nature of the precipitates. A modified version of the maximum separation method for cluster selection is proposed for identifying the hyperfine precipitates in atom probe tomography reconstructions, allowing for precise localization without requiring user defined parameters. The formation of precipitates during sample cooling is shown to be a kinetically controlled process dominated by two different mechanisms depending on the temperature.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Ali Shafiei
Summary: A new method was proposed to predict the compositions of EHEAs in the Al-Co-Cr-Fe-Ni system, by designing new eutectic or near-eutectic alloys through mixing alloys located on the same eutectic line. Compositional maps were created to show the relations between constituent elements in eutectic alloys, suggesting that EHEAs are derived from binary and ternary eutectic alloys. The proposed diagrams can be considered as convenient methods for evaluating the composition of EHEAs in the Al-Co-Cr-Fe-Ni system.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Xichuan Liao, Yangchun Chen, Hengfeng Gong, Tong Liu, Huiqiu Deng, Wangyu Hu, Fei Gao
Summary: This study investigated the stability of pre-existing Cr-rich α' precipitates under cascade damage and their effect on cascaded-induced defects in irradiated Fe-Cr-Al alloys through molecular dynamics simulations. The results showed that the interaction of cascade with the pre-existing precipitate slightly increased the number of surviving Frenkel pairs and enriched the level of Cr atoms as interstitials. Furthermore, the presence of the Cr-rich precipitate did not considerably affect the fraction of defects in clusters and cluster size.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ci Wang, Stephan Schonecker, Wei Li, Yaochun Yang, Qing-Miao Hu, Levente Vitos
Summary: Using density-functional theory, we determined the generalized stacking fault energy for the twinning system in Fe and Fe-Cr alloys, showing that the isosceles twin boundary configuration is energetically preferred. The magnetic ordering effects and Cr content have significant influences on the twin boundary formation and migration energies in different magnetic states.
Article
Materials Science, Multidisciplinary
Damian Sobieraj, Jan S. Wrobel, Mark R. Gilbert, Andrey Litnovsky, Felix Klein, Krzysztof J. Kurzydlowski, Duc Nguyen-Manh
Summary: W-Cr-Y smart alloys show protective behavior for plasma facing components and Y and Ti additions affect phase stability and short-range ordering of the alloy.
Article
Materials Science, Multidisciplinary
Yan-Ru Lin, Arunodaya Bhattacharya, Da Chen, Ji-Jung Kai, Jean Henry, Steven J. Zinkle
Summary: In this study, the cavity swelling behavior in different alloys under dual ion irradiations was investigated, revealing the impact of irradiation temperature and solute concentration on cavity swelling. The findings suggest that pure Fe has a lower peak swelling temperature compared to Fe-Cr alloys, and chromium solute plays a significant role in suppressing cavity swelling at lower temperatures but has little effect at higher temperatures.
Article
Materials Science, Multidisciplinary
Benjamin Klaes, Rodrigue Larde, Fabien Delaroche, Constantinos Hatzoglou, Stefan Parvianien, Jonathan Houard, Gerald Da Costa, Antoine Normand, Martin Brault, Bertrand Radiguet, Francois Vurpillot
Summary: This article presents a fast and highly efficient algorithm for reconstructing the three-dimensional structure of metal samples, analyzing crystallographic lattice and defects, and developing specific tools for characterizing lattice distortions. Experimental results on tungsten demonstrate the high spatial precision of the algorithm, which has successfully been applied to locating and characterizing defects.
MICROSCOPY AND MICROANALYSIS
(2021)
Article
Materials Science, Multidisciplinary
D. Sornin, U. Ehrnsten, N. Mozzani, J. Rantala, M. Walter, A. Hobt, J. Aktaa, E. Onorbe, M. Hernandez-Mayoral, A. Ulbricht, S. Gicquel, L. Frank, Y. de Carlan
Summary: The study presents novel results on the ODS creep properties obtained from a round robin of inner gas pressure creep testing conducted by four European teams. The ODS steel tubes show a typical failure by leakage under inner gas pressure, without evidence of tertiary creep stage. The technique of inner gas pressure creep testing demonstrates remarkable consistency among different laboratories and proves to be efficient for ODS steel cladding tube qualification.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Nuclear Science & Technology
L. Malerba, M. J. Caturla, E. Gaganidze, C. Kaden, M. J. Konstantinovic, P. Olsson, C. Robertson, D. Rodney, A. M. Ruiz-Moreno, M. Serrano, J. Aktaa, N. Anento, S. Austin, A. Bakaev, J. P. Balbuena, F. Bergner, F. Boioli, M. Boleininger, G. Bonny, N. Castin, J. B. J. Chapman, P. Chekhonin, M. Clozel, B. Devincre, L. Dupuy, G. Diego, S. L. Dudarev, C-C Fu, R. Gatti, L. Gelebart, B. Gomez-Ferrer, D. Goncalves, C. Guerrero, P. M. Gueye, P. Hahner, S. P. Hannula, Q. Hayat, M. Hernandez-Mayoral, J. Jagielski, N. Jennett, F. Jimenez, G. Kapoor, A. Kraych, T. Khvan, L. Kurpaska, A. Kuronen, N. Kvashin, O. Libera, P-W Ma, T. Manninen, M-C Marinica, S. Merino, E. Meslin, F. Mompiou, F. Mota, H. Namburi, C. J. Ortiz, C. Pareige, M. Prester, R. R. Rajakrishnan, M. Sauzay, A. Serra, I Simonovski, F. Soisson, P. Spatig, D. Tanguy, D. Terentyev, M. Trebala, M. Trochet, A. Ulbricht, M. Vallet, K. Vogel, T. Yalcinkaya, J. Zhao
Summary: The M4F project aims to study the effects of radiation on F/M steels, integrating various experimental and computational materials science tools to understand and simulate the complex phenomena of radiation-induced defect formation and evolution. The project focuses on local deformation and ion irradiation effects, developing models and best practices, and is entering its fourth year, close to delivering high-quality results.
NUCLEAR MATERIALS AND ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Yajie Zhao, Arunodaya Bhattacharya, Cristelle Pareige, Caleb Massey, Pengcheng Zhu, Jonathan D. Poplawsky, Jean Henry, Steven J. Zinkle
Summary: The kinetics of CrRP formation due to particle irradiation were investigated, and it was found that the formation of CrRP can be suppressed under certain irradiation conditions. The distribution of CrRP after irradiation was analyzed using atom probe tomography (APT), and a radiation modified precipitation mechanism was proposed to explain the evolution of CrRP.
Article
Materials Science, Multidisciplinary
S. M. Levine, C. Pareige, Z. Jiao, P. D. Edmondson, G. S. Was, S. J. Zinkle, A. Bhattacharya
Summary: This study investigated the stability of different solute nanoclusters during radiation and found that they have distinct ballistic dissolution susceptibilities. The results also demonstrated the importance of solute concentration gradient in recovering from ballistic dissolution.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
V. S. M. Pereira, T. P. Davis, M. H. Mayoral, A. Kumar, H. Schut, J. Sietsma
Summary: Oxide Dispersion Strengthened (ODS) steels have high thermal stability, high resistance to creep and radiation-induced damage. These properties are attributed to the presence of fine and highly thermally stable yttrium-oxygen (Y-O) based nanoparticles. This study assessed the effects of annealing at 1400 K on the microstructure and oxide nanoparticles in a 0.3% Y2O3 ODS Eurofer steel.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Sohail Shah, Elisabeth Thronsen, Constantinos Hatzoglou, Sigurd Wenner, Calin D. Marioara, Randi Holmestad, Bjorn Holmedal
Summary: Cyclic ageing at room temperature enhances the mechanical properties of aluminum alloys by continuously injecting vacancies and enabling the dynamic precipitation of fine solute clusters. These clusters, uniformly distributed throughout the material, exhibit structural similarities to GPI zones observed after low temperature ageing. The strengthening effect of solute clusters is accelerated during cyclic ageing compared to natural ageing.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Andreas Ulbricht, Mercedes Hernandez-Mayoral, Elvira Onorbe, Auriane Etienne, Bertrand Radiguet, Eric Hirschmann, Andreas Wagner, Hieronymus Hein, Frank Bergner
Summary: This study provides a detailed understanding of the irradiation-induced nanofeatures in reactor pressure vessel steels and identifies the dominant factors contributing to the increase in Vickers hardness. The results suggest that under high flux conditions, smaller nanoscale solute atom clusters and sub-nanoscale vacancy clusters are formed, leading to moderate effects on hardening.
Article
Materials Science, Multidisciplinary
Angelique Chabanon, Alexandre Michau, Michel Leon Schlegel, Deniz C. Gunduz, Beatriz Puga, Frederic Miserque, Frederic Schuster, Hicham Maskrot, Cristelle Pareige, Emmanuel Cadel, Georges Beainy, Veronique Cloute-Cazalaa, Srikanth Narasimalu, Bingqing Yao, Zhili Dong, Fanny Balbaud-Celerier
Summary: A pre-treatment using High-Power Impulse Magnetron Sputtering (HiPIMS) was performed to modify the surface of 304L stainless steel, creating a few nanometers wide substrate/coating interface that improved adhesion and corrosion resistance of the coating.
Article
Multidisciplinary Sciences
Samara M. Levine, Cristelle Pareige, Zhijie Jiao, Philip D. Edmondson, Gary S. Was, Steven J. Zinkle, Arunodaya Bhattacharya
Summary: The data presented in this article is supplementary to the research article, providing valuable information on phase instabilities in neutron-irradiated austenitic stainless steels. The article includes detailed experimental methods and analysis using the OSCAR program, which can be reused for processing other APT datasets. Overall, these findings contribute to the understanding of material behavior under particle bombardment.
Article
Multidisciplinary Sciences
K. A. Hunnestad, C. Hatzoglou, Z. M. Khalid, P. E. Vullum, Z. Yan, E. Bourret, A. T. J. van Helvoort, S. M. Selbach, D. Meier
Summary: Chemical doping plays a crucial role in controlling the physical properties of semiconductors, especially in complex oxides. However, determining the density variations of dopant atoms is a major challenge in lightly doped systems. In this study, atom probe tomography was used to resolve the atomic sites occupied by dopant atoms in the small band gap semiconductor Er(Mn,Ti)O-3 and quantify their spatial variations.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Sohail Shah, Akash Gopal, Elisabeth Thronsen, Constantinos Hatzoglou, Bjorn Holmedal
Summary: Comparison between natural and artificial ageing treatments with cyclic deformation ageing at room temperature revealed different fracture behaviors and mechanical responses for Al-Zn-Mg alloys. Cyclic ageing resulted in early slant shear fracture, while natural ageing improved mechanical properties.
MATERIALS & DESIGN
(2022)
Article
Nuclear Science & Technology
Elvira Onorbe, Mercedes Hernandez-Mayora, Rebeca Hernandez, Marta Serrano
Summary: This study investigates the thermal stability of a 9Cr-1Mo ferritic/martensitic steel before and after thermomechanical treatment. The results show that the material after thermomechanical treatment has a more stable microstructure compared to the as received material.
NUCLEAR MATERIALS AND ENERGY
(2022)
Article
Materials Science, Multidisciplinary
C. Pareige, A. Etienne, P-m. Gueye, A. Medvedev, C. Kaden, M. J. Konstantinovic, L. Malerba
Summary: This paper presents an atom probe investigation of the microstructural evolution of FeCr-NiSiP alloys under ion and neutron irradiation, highlighting the differences and commonalities between the two types of irradiation and the influence of minor elements on the formation of solute rich clusters (SRCs) and alpha' clusters.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Constantinos Hatzoglou, Gerald Da Costa, Peter Wells, Xiaochen Ren, Brian P. Geiser, David J. Larson, Remi Demoulin, Kasper Hunnestad, Etienne Talbot, Baishakhi Mazumder, Dennis Meier, Francois Vurpillot
Summary: This paper proposes a simple semianalytical approach to reconstruct multilayered structures in atom probe tomography (APT), and demonstrates experimentally and theoretically that the depth accuracy of reconstructed APT images is improved using this method.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Liuming Wei, Jingwen Li, Yonggang Li, Qirong Zheng, Fan Cheng, Chuanguo Zhang, Jingyu Li, Gaofeng Zhao, Zhi Zeng
Summary: This study investigates the influence of He-V complexes on H behaviors on different W surfaces using DFT calculations. The results show that H dissolution is most difficult but H trapping is easiest on the W (110) surface, while the opposite is true on the W (111) surface. Moreover, the presence of He-V complexes increases the difficulty of H diffusion from bulk to surface and desorption.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yan Meng, Song Zeng, Chen Chen, Chaowen Zhu, Huahai Shen, Xiaosong Zhou, Xiaochun Han
Summary: The characteristics of magnetron sputtered Cr coatings vary with different temperature, bias voltage, and pressure. Coatings with random orientation, good crystallinity, and small grain size exhibit favorable oxidation behavior, while coatings with strong (200) texture, poor crystallinity, and large grains have many intrinsic defects that are detrimental to the protection property of the Cr coatings.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Xinyuan Xu, Zefeng Yu, Wei-Ying Chen, Aiping Chen, Arthur Motta, Xing Wang
Summary: This study presents an automated approach for characterizing grain morphology in TEM images recorded during ion irradiation. By combining a machine learning model and a computer vision algorithm, comparable results to human analysis can be achieved with significantly reduced analysis time. Researchers can train their own models following the procedures described in this study to automate grain morphology analysis of their own TEM images.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Shihao Wu, Dong Wang, Yapei Zhang, Koji Okamoto, Marco Pellegrini, Wenxi Tian, Suizheng Qiu, G. H. Su
Summary: The oxidation and degradation mechanisms of Cr coating on Zr alloy cladding under high temperature steam atmosphere are summarized, and a mathematical analysis model is established to predict the changes in coating thickness. The model is applied in the analysis of structure evolution under different conditions.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
V. Diaz-Mena, J. de Prado, M. Roldan, I. Izaguirre, M. Sanchez, M. Rieth, A. Urena
Summary: The brazeability of a cupronickel alloy was evaluated as a filler alloy for high-temperature joining of tungsten to steel. The study investigated the brazing conditions and the impact of the selected filler on the joint quality using numerical software. The results showed different metallurgical interactions and diffusion phenomena between the filler alloy and the base materials at different temperatures. The study emphasized the importance of selecting a suitable filler to mitigate residual stresses in the joints.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Pengcheng Zhu, Yajie Zhao, Yan-Ru Lin, Jean Henry, Steven J. Zinkle
Summary: This study investigates the effect of heavy-ion irradiation on radiation hardening in high-purity binary alloy Fe18Cr. Nanoindentation testing and high-quality TEM imaging were conducted to extract hardness and microstructure information. The strength factor was accurately calculated based on the detailed TEM characterization of irradiated microstructures, and a refined hardening superposition method was applied to quantify the mechanical properties of ion-irradiated materials.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bin Wu, Haixia Ning, Hanzhen Zhu, Jianjun Chen, Kang Wang, Daiyu Zhang, Fu Wang, Qilong Liao
Summary: This study discusses the effects of ZrO2 and B2O3 on the phase composition and properties of SAP-based glass-ceramics. The results show that ZrO2 addition improves the formation of NZP phase while restricting the crystallization of AlPO4 phases. The correct ratios of ZrO2 and B2O3 allow only the formation of NZP phase within the SAP glass.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Hwasung Yeom, Greg Johnson, Benjamin Maier, Tyler Dabney, Kumar Sridharan
Summary: Cr-Nb bilayer coatings were developed using cold spray deposition to improve the limiting operational temperature of Cr-coated Zr-alloy system. The coatings exhibited outstanding oxidation resistance at high temperatures and formed continuous intermetallic compound layers at the interfaces.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Padhraic L. Mulligan, Andrew T. Nelson, Chad M. Parish, Patrick A. Champlin, Xiang Chen, Daniel Morrall, Jason M. Harp
Summary: Environmental barrier coatings are being developed to reduce oxidation and embrittlement in Zr-based materials. Chromium nitride is a candidate for this application, but understanding its impact on irradiation-induced creep and microstructure is critical.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Dexuan Yan, Xinlei Cao, Ke Shen
Summary: This study investigated the purification mechanism of polycrystalline graphite by comparing IG-11 graphite with IG-110 nuclear grade graphite. The analysis revealed that metallic impurities in IG-11 were primarily segregated within graphite porosities, while IG-110 demonstrated a significant reduction in impurities. This research contributes to the development of innovative graphite purification techniques for greater purity and stronger oxidation resistance.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Wei Xu, Wei Peng, Lei Shi, Qi Sun
Summary: This paper investigates the oxidation and shape evolution of matrix graphite in high temperature gas-cooled reactors during air-ingress accidents. A reaction kinetics model is established and computational fluid dynamics with a dynamic mesh method is used to simulate the oxidation process. The results show that the geometric shape of graphite changes significantly with increasing flow rate, and the graphite pebbles tend to form a structure with a narrow front and wide tail.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Allison Harward, Casey Elliott, Michael Shaltry, Krista Carlson, Tae-Sic Yoo, Guy Fredrickson, Michael Patterson, Michael F. Simpson
Summary: This paper investigates the hygroscopic properties of eutectic LiCl-KCl absorbed into zeolite-4A. The study finds that water absorption and corrosion worsen with increasing salt loading. It also suggests that the salt can be stored in a non-inert atmosphere for a certain period of time.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Takaaki Koyanagi, Xunxiang Hu, Christian M. Petrie, Gyanender Singh, Caen Ang, Christian P. Deck, Weon-Ju Kim, Daejong Kim, James Braun, Yutai Katoh
Summary: This study provides critical experimental data on the effects of irradiation on the hermeticity of SiC composite cladding, finding that irradiation can cause a decrease in hermeticity and cracking, and coating the outer surface can mitigate the cracking issue.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
S. Krat, A. Prishvitsyn, Yu. Gasparyan
Summary: This study proposes a probabilistic and diffusion-based model to describe the co-deposition of multiple hydrogen isotopes with slowly grown metal layers. The model calculates the relative concentrations of different hydrogen isotopes in the co-deposited metal layers. It is found that if hydrogen isotopes have different detrapping energies, only the isotope with the highest detrapping energy shows a monotonic decrease in concentration with deposition temperature. Furthermore, the study evaluates the uncertainty of tritium concentration in the co-deposited layer based on the uncertainty in detrapping energy of tritium and deuterium, predicting a >10% tritium concentration uncertainty for a 0.01 eV difference.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Tijo Vazhappilly, Arup Kumar Pathak
Summary: This study investigates the effect of Ce atom substitution in UO2 on its thermophysical properties using density functional theory. The results show that the Ce substitution levels and the oxidation state of Ce/U atoms strongly influence the band structure and specific heat capacity of the UO2 lattice. These findings provide important insights into the fuel properties of UO2 under reactor conditions.
JOURNAL OF NUCLEAR MATERIALS
(2024)