Article
Chemistry, Physical
Yusuke Onuki, Kasumi Masaoka, Shigeo Sato
Summary: The texture and microstructure formation of a Ca-added alloy, AZX612, during uniaxial tensile deformation at elevated temperatures is reported. The total elongation increases with temperature primarily due to prolonged unstable plastic deformation. The significant elongation at high temperatures is attributable to the relaxation of strain concentration via continuous dynamic recrystallization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Shefali Shukla, R. N. Singh, Y. S. Kashyap, T. N. Murty, Nachiket Keskar, Tushar Roy, Prashant Singh, Mayank Shukla
Summary: Hydrogen diffusion studies in Zr-2.5% Nb alloy pressure tube material are important for modeling localized embrittlement phenomenon. The microstructure of the pressure tube consists of lamellar alpha-Zr and beta-phase with stingers and globules. The diffusivity values for hydrogen in Zr-2.5%Nb alloy along different pressure tube directions were studied, and correlation with the microstructure was analyzed. Neutron radiography was used to study diffusion along different directions, and a theoretical approach was followed for evaluating diffusivity values for the alpha-Zr and beta-Zr phases.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
J. R. Santisteban, N. L. Buitrago, A. Moya Riffo, S. R. Soria, A. L. Baruj, M. Schulz, M. Grosse, V. Luzin, M. Hache, L. Barrow, M. R. Daymond
Summary: This study determines the diffusion coefficients of hydrogen in Zircaloy-2 and Zr-2.5%Nb alloys, revealing differences in diffusion rates along different directions and metallurgical conditions. The findings are crucial for evaluating the performance and crack growth velocity of zirconium alloys in nuclear power plants.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
J. Carricondo, S. R. Soria, J. R. Santisteban, N. Kardjilov, M. Iribarren, C. Corvalan-Moya
Summary: This study utilized neutron imaging and laser-induced breakdown spectroscopy to determine the diffusion coefficients of erbium in Zr alloy and pure Nb, revealing significant differences in diffusion rates between the materials. The results demonstrate that neutron imaging is an effective technique for studying erbium diffusion in nuclear fuel cladding.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Chemistry, Physical
T. N. Vershinina, I. A. Bobrikov, S. Sumnikov, A. M. Balagurov, A. K. Mohamed, I. S. Golovin
Summary: The evolution of structural phases of Fe-38.4 at%Ga alloy was studied through neutron diffraction experiments, revealing phase transitions at specific temperatures and the dependency of transition temperatures on the alloy's prehistory.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
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
Chemistry, Physical
T. N. Vershinina, N. Yu. Samoylova, S. V. Sumnikov, A. M. Balagurov, V. V. Palacheva, I. S. Golovin
Summary: The evolution in phase composition of as-cast Fe-Ga alloys during continuous heating and subsequent cooling was studied, and distinct stages of phase formation were identified based on neutron diffraction analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Pramote Thirathipviwat, Yusuke Onuki, Kazuki Umemura, Shigeo Sato
Summary: This study investigates the microstructure of moderately deformed 1 %C-doped CoCrFeNi complex concentrated alloys (CCA) and its evolution at different annealing temperatures. The research finds that the introduction of carbon atoms leads to the accumulation of a large number of dislocations and stored strain energy. The addition of carbon delays the recrystallization process. In addition, the traditional fabrication method produces a fine recrystallized microstructure due to the large dislocation density and carbide precipitation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Weijia Gong, Pavel Trtik, Fengqiang Ma, Yuxiao Jia, Jinshan Li, Johannes Bertsch
Summary: This study investigates the response of hydrogen diffusion and hydride precipitation in an unirradiated duplex cladding to thermo-mechanical cycles using high-resolution neutron imaging. The results demonstrate that the material heterogeneity is the main driving force for hydrogen diffusion, while external stress only contributes locally to hydrogen field variation. Hydride precipitation is significantly restrained in the compressed area.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Lara Righi
Summary: The martensitic transition of the ternary Heusler alloy Ni2.09Mn0.91Ga was studied using neutron diffraction, revealing a modulated 5M structure at low temperatures and a gradual change in the martensitic lattice parameters as the temperature increases. The chemical composition was found to be Ni2.07Mn0.93Ga, close to the nominal formula.
Article
Chemistry, Physical
C. Juillet, Q. Auzoux, F. Datcharry, F. Martin, M. Tupin
Summary: In this study, the permeation process of tritium in nuclear pressurized water reactors was investigated by using deuterium as an isotopic tracer. The results showed that surface recombination reaction in the metal was the rate-limiting step of the permeation process, and stress in the specimens decreased the apparent activation energy of deuterium desorption.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Baoqi Guo, Wenqi Mao, Yan Chong, Akinobu Shibata, Stefanus Harjo, Wu Gong, Huicong Chen, John J. Jonas, Nobuhiro Tsuji
Summary: The dynamic transformation from alpha to beta phase in a zirconium alloy during hot compression was revealed by in-situ neutron diffraction. The transformation was accompanied by diffusion of Sn from beta to alpha phase, resulting in changes in lattice parameters and the microstructure of alpha grains. The occurrence of the dynamic transformation was attributed to an increase in the Gibbs free energy of the alpha phase relative to the beta phase, making the alpha phase thermodynamically more unstable than the beta phase.
Article
Nanoscience & Nanotechnology
Jan Honnige, Cui Er Seow, Supriyo Ganguly, Xiangfang Xu, Sandra Cabeza, Harry Coules, Stewart Williams
Summary: This paper focuses on understanding the microstructural features, phase formation, and three-dimensional residual stress state variation in the manufacture of structural components made from nickel-based super alloys using Wire + Arc Additive Manufacturing (WAAM). The research aims to address the challenges of process residual stress and undesired microstructure in WAAM, providing insights into improving mechanical properties and manufacturing processes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Liliana I. Duarte, Francesco Fagnoni, Robert Zubler, Weijia Gong, Pavel Trtik, Johannes Bertsch
Summary: Hydrides precipitation induced by slow cooling of hydrogen-charged specimens of different Zircaloy-2 claddings were analyzed using optical and scanning electron microscopy, as well as neutron radiography. The study revealed that practically complete migration of hydrogen towards the liner-cladding interface occurred, resulting in very high local hydrogen concentrations exceeding 2000 wppm.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Chemistry, Physical
E. Bassini, A. Sivo, P. A. Martelli, E. Rajczak, G. Marchese, F. Calignano, S. Biamino, D. Ugues
Summary: In this study, a low weldable Ni-Based alloy, CM247LC, was produced using selective laser melting (SLM). Despite process parameter optimization, the alloy still had a high defect volume fraction. However, the application of a gamma'-sub-solvus Hot Isostatic Pressing Cycle (HIP) successfully eliminated cracks and reduced the defects fraction. The HIP cycle also played a crucial role in stabilizing the microstructure and limiting carbide coarsening during heat treatment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Multidisciplinary
Matthew J. Coak, David M. Jarvis, Hayrullo Hamidov, Andrew R. Wildes, Joseph A. M. Paddison, Cheng Liu, Charles R. S. Haines, Ngoc T. Dang, Sergey E. Kichanov, Boris N. Savenko, Sungmin Lee, Marie Kratochvilova, Stefan Klotz, Thomas C. Hansen, Denis P. Kozlenko, Je-Geun Park, Siddharth S. Saxena
Summary: Research on the magnetic structure of 2D material FePS3 under different pressures reveals changes in magnetic order and the emergence of a form of magnetic short-range order that persists above room temperature as pressure increases. The study also finds that the persistence of magnetism well into the HP-II metallic state contradicts previous x-ray spectroscopy results suggesting a spin-crossover transition.
Article
Chemistry, Physical
Mikhail A. Kuzovnikov, Vladimir E. Antonov, Thomas Hansen, Alexandre S. Ivanov, Alexander Kolesnikov, Valery Kulakov, Vitaly D. Muzalevsky, Stanislav Savvin, Marek Tkacz
Summary: Three hydrides - PdHx, MoHx, and TiHx - exhibit an inverse isotope effect in superconductivity, where the phase with a heavier hydrogen isotope, deuterium, has a higher critical temperature. The origin of this effect is not yet certain, but the commonly accepted explanation points to the strong anharmonicity of optical hydrogen vibrations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Raphael Finger, Thomas C. Hansen, Holger Kohlmann
Summary: In situ neutron diffraction is an important technique for characterizing functional materials. A new sapphire single-crystal gas-pressure cell has been developed and evaluated, allowing for studying materials under different temperature and hydrogen pressure conditions. The cell has higher maximum temperatures and lower background noise compared to earlier versions.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Engineering, Manufacturing
Olfa D'Angelo, Felix Kuthe, Szu-Jia Liu, Raphael Wiedey, Joe M. Bennett, Martina Meisnar, Andrew Barnes, W. Till Kranz, Thomas Voigtmann, Andreas Meyer
Summary: The study presents a powder handling and manufacturing process that operates independently of gravity, demonstrating that powder deposition homogeneity and density are not affected by gravity and cohesion forces. Experimental proof of concept was successfully achieved by 3D printing parts on-ground and on parabolic flights in weightlessness, showcasing the versatility of the process and opening the way for additive manufacturing of recycled materials.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Physical
Gohil S. Thakur, Thomas C. Hansen, Walter Schnelle, Shuping Guo, Oleg Janson, Jeroen van den Brink, Claudia Felser, Martin Jansen
Summary: The synthesis, crystal structure, and magnetic properties of a new 2:1 ordered triple perovskite Sr3CaOs2O9 were reported. It exhibits a unique buckled honeycomb lattice of osmium, high Neel temperature of approximately 385 K, and electrical insulating behavior.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Simon R. Larsen, Vitalii Shtender, Daniel Hedlund, Erna K. Delczeg-Czirjak, Premysl Beran, Johan Cedervall, Alena Vishina, Thomas C. Hansen, Heike C. Herper, Peter Svedlindh, Olle Eriksson, Martin Sahlberg
Summary: The atomic and magnetic structures of Mn(Co,Ge)2, which crystallizes in a superstructure of the MgZn2-type structure, have been reported. The system exhibits different magnetic structures at different temperatures.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Rasmus Palm, Kenneth Tuul, Frank Elson, Elisabetta Nocerino, Ola K. Forslund, Thomas C. Hansen, Jaan Aruvali, Martin Mansson
Summary: This study investigates the influence of adding relatively low amounts of mesoporous carbon black on the decomposition and reforming processes of hydrogen storage material NaAlH4 through in situ diffraction. The results show that even with low concentrations, mesoporous carbon black can significantly enhance the reversibility of hydrogen storage in NaAlH4.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Ceramics
Ahmet Bahadir Yildiz, Hu Yixuan, R. Prasath Babu, Thomas C. Hansen, Mirva Eriksson, Kolan Madhav Reddy, Peter Hedstro
Summary: We have designed a novel multi-principal element carbide system (Ti,Zr,Hf,W)C and successfully synthesized a single-phase (Ti,Zr,Hf,W)C. The material exhibits high nanohardness and fracture toughness. Aging studies show the stability of the single-phase carbide solid solution even within the predicted miscibility gap of the system. Electron microscopy characterization reveals phase separation and the formation of lamellar structure and precipitates. The decomposition kinetics is sluggish due to reduced driving force.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Crystallography
Andre Goetze, Siobhan Christina Stevenson, Thomas Christian Hansen, Holger Kohlmann
Summary: Binary intermetallic compounds, such as FePd3, have attracted attention due to their physical, magnetic, and catalytic properties. In this study, the hydrogenation properties of ordered FePd3 and disordered Fe0.25Pd0.75 were investigated using various in situ methods. The results showed that FePd3 absorbs small amounts of hydrogen at room temperature and follows the Sieverts' law. The [Pd-6] octahedral voids were filled with hydrogen atoms as the hydrogen pressure increased, leading to a decrease in long-range order of Fe and Pd atoms. The magnetic moments of iron atoms in FePd3 exhibited a temperature dependence that was consistent with a 3D Ising or Heisenberg model.
Article
Multidisciplinary Sciences
Christian Neumann, Johannes Thore, Melanie Clozel, Jens Guenster, Janka Wilbig, Andreas Meyer
Summary: Additive manufacturing using metallic powders in microgravity has been proven feasible through several sounding rocket flights, paving the way for future tests in prolonged microgravity settings. This advancement is crucial for space exploration beyond low Earth orbit.
Article
Chemistry, Multidisciplinary
Sandeep K. Gupta, Hannah H. Nielsen, Andreas M. Thiel, Emil A. . Klahn, Erxi Feng, Huibo B. Cao, Thomas C. Hansen, Eddy Lelievre, Arsen Gukasov, Iurii Kibalin, Sebastian Dechert, Serhiy Demeshko, Jacob Overgaard, Franc Meyer, Franc Meyer
Summary: In this study, a highly anisotropic single-ion magnet (SIM) with stability under ambient conditions was synthesized and comprehensively characterized. The influence of the ligand field on the degeneracy and population of d-orbitals in a specific coordination environment was investigated, providing important insights for the rational design and enhancement of magnetic anisotropy in SIMs.
Article
Materials Science, Multidisciplinary
John M. Wilkinson, Stephen J. Blundell, Sebastian Biesenkamp, Markus Braden, Thomas C. Hansen, Kacper Koteras, Wojciech Grochala, Paolo Barone, Jose Lorenzana, Zoran Mazej, Gasper Tavcar
Summary: KAgF3 is a quasi-one-dimensional quantum antiferromagnet with interesting structural and magnetic transitions. At low temperatures, it orders as an A-type antiferromagnet with an ordered moment. Previous magnetometry study provides evidence for an intermediate phase at T-N1 < T < T-N2, but its nature remains unknown.
Article
Chemistry, Multidisciplinary
Daniel Risskov Sorensen, Andreas Ostergaard Drejer, Michael Heere, Anatoliy Senyshyn, Matthias Frontzek, Thomas Hansen, Christophe Didier, Vanessa K. Peterson, Dorthe Bomholdt Ravnsbaek, Mads Ry Vogel Jorgensen
Summary: In operando powder diffraction is a powerful tool for investigating battery electrode materials. While X-ray powder diffraction is routine, neutron powder diffraction is still less established. Researchers have developed a new electrochemical cell for in operando neutron powder diffraction that is easy to use and can cycle electrode materials under electrochemical conditions similar to standard laboratory cells.
Article
Materials Science, Multidisciplinary
N. Qureshi, H. E. Fischer, S. X. M. Riberolles, T. C. Hansen, M. Ciomaga Hatnean, O. A. Petrenko
Summary: In this study, we investigate the short-range magnetic spin correlations in two compounds of rare-earth strontium oxides using total-scattering powder neutron diffraction, reverse Monte Carlo simulations, and magnetic pair-distribution function analysis. The compounds exhibit a distorted honeycomb lattice, leading to significant geometrical frustration due to antiferromagnetic exchange between magnetic ions. The results demonstrate the ordering of the short-range spin correlations above the respective Néel temperatures, indicating the dominance of nearest and next-nearest interactions.
Article
Physics, Multidisciplinary
Qianhui Xu, Yi Liu, Sijie Hao, Jiahui Qian, Cheng Su, Chin-Wei Wang, Thomas Hansen, Zhendong Fu, Yixi Su, Wei Li, Guang-Han Cao, Yinguo Xiao, Wentao Jin
Summary: The ground-state magnetic structures of Eu2+ spins in RbEu(Fe1-xNix)(4)As-4 superconductors have been studied using neutron powder diffraction measurements. It is observed that the magnetic propagation vector of the Eu sublattice diminishes with increasing Ni doping, leading to a reduction in the rotation angle between neighboring Eu layers. The magnetic structure transitions from a helical modulation to a collinear ferromagnetic structure as the superconductivity is suppressed.
PHYSICAL REVIEW RESEARCH
(2022)