Article
Engineering, Biomedical
Min-Kyu Lee, Hyun Lee, Cheonil Park, In-Gu Kang, Jinyoung Kim, Hyoun-Ee Kim, Hyun-Do Jung, Tae-Sik Jang
Summary: In recent years, pure iron has gained attention as a biodegradable orthopedic implant material. However, its slow and uneven degradation in physiological conditions limits its practical applications. In this study, researchers developed a novel approach using nanostructured surface topography and galvanic reaction to achieve uniform and accelerated degradation of pure iron implants. Results showed that this approach effectively enhanced the mechanical properties and biocompatibility of the implants, demonstrating its potential for long-term biosafety and clinical efficacy.
BIOACTIVE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Kristian Mathis, Michal Knapek, Filip Siska, Petr Harcuba, David Ugi, Peter Dusan Ispanovity, Istvan Groma, Kwang Seon Shin
Summary: Micro-deformation testing on single-crystal Mg micropillars revealed the dynamics of mechanical twinning formation, from nucleation to thickening and coalescence of twins. The study showed that the critical thickness of a twin must be reached before triggering the nucleation of another twin, and the lateral growth rates of twins were found to be on the order of 10(-5)-10(-4) m/s.
MATERIALS & DESIGN
(2021)
Article
Engineering, Manufacturing
T. S. Guruprasad, V. Keryvin, G. Kermouche, Y. Marthouret, S. Sao-Joao
Summary: The compressive behavior of carbon fibers is difficult to determine due to their heterogeneous and anisotropic nature, as well as their small size. In this study, in situ compression tests using SEM were conducted to investigate the compressive properties of two different carbon fibers. The results showed that the compressive properties of the fibers were lower than their tensile properties, and this can be attributed to the core-shell structure of the fibers.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Reza Hosseinabadi, Heinz Riesch-Oppermann, James P. Best, Gerhard Dehm, Christoph Kirchlechner
Summary: The impact of a coherent twin boundary (CTB) on the size scaling of shear stress in micropillar compression tests has been investigated. The study found that the CTB has a size-dependent contribution to shear stress, with a more prominent effect observed in smaller pillars.
Article
Engineering, Mechanical
Albert Kong, Mattia Bacca
Summary: In this paper, the authors propose a solution to the limitation of self-adhesion in micropillar arrays by designing slanted micropillars. The study shows that slanting the micropillars can increase their packing and length, but excessive slanting results in a decrease. Slanted micropillars also improve the orthogonal compliance and enhance the adhesive strength of fibrillar adhesives.
EXTREME MECHANICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Ching-Heng Shiau, Miguel Pena, Yongchang Li, Sisi Xiang, Cheng Sun, Michael D. McMurtrey, Lin Shao
Summary: A micropillar compression study was conducted on proton-irradiated additively manufactured 316L stainless steels using two different techniques. Cross-sectional pillars were found to significantly reduce dpa uncertainty and exhibit dpa-dependent hardening. Post-compression transmission electron microscopy allowed the determination of deformation mechanisms of individual micropillars.
Article
Multidisciplinary Sciences
Samuel McPhee, Alexander Groetsch, Jonathan D. Shephard, Uwe Wolfram
Summary: The study shows that ultrashort pulsed laser ablation is a safe and effective tool for extracting micropillar samples to prepare bone specimens for mechanical testing. The results were verified and a computational model was provided for efficient evaluation of the process.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Karolina Pagowska, Maciej Kozubal, Andrzej Taube, Renata Kruszka, Maciej Kaminski, Norbert Kwietniewski, Marcin Juchniewicz, Anna Szerling
Summary: This study developed a thermally stable isolation technique for AlGaN/GaN HEMTs through Fe ion implantation, achieving highly resistive and thermally stable isolation regions. The technology provides flexibility in the fabrication process and potentially allows for an increased thermal budget.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Yilun Xu, Tianhong Gu, Jingwei Xian, Finn Giuliani, T. Ben Britton, Christopher M. Gourlay, Fionn P. E. Dunne
Summary: The mechanical properties and temperature sensitivity of beta-Sn single crystals and polycrystalline beta-Sn-rich alloys have been investigated using a combination of experimental and numerical methods. The results provide insights into the behavior of electronic solders under thermomechanical loading.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
A. Gumarov, I. Yanilkin, R. Yusupov, A. G. Kiiamov, L. R. Tagirov, R. Khaibullin
Summary: The study demonstrates the formation of dilute Pd1-xFex composites with tunable magnetic properties through ion-beam implantation. Iron implanted Pd films exhibit ferromagnetic behavior at low temperatures and show a multiphase composite magnetic structure with robustness to vacuum annealing. The research reveals a magnetically inhomogeneous state due to spinodal decomposition, forming regions with different iron contents in the implanted Pd1-xFex films.
Article
Physics, Applied
Shaohua Yan, Zheng Zhong, Qing. H. Qin
Summary: This paper investigates the mechanical properties of nanotwined copper at micro/nanoscales. The influence of vertical twin-boundary spacing and orientation on the deformation behavior of micropillars is explored through experiments, simulations, and theoretical analysis. The results show that decreasing twin-boundary spacing leads to increased yield stress, and micropillars with slanted twin boundaries at a spacing of 15.5 nm exhibit the highest strength.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Talaye Arjmandabasi, David Ugi, Adam Revesz, Erhard Schafler, David J. Browne, Zsolt Kovacs
Summary: In-situ compression of metallic glass micropillars with continuous acoustic emission recording was conducted. A size effect was observed in both shear band operation and acoustic emission signal, regardless of pre-deformation. The compliance of the pillar/indenter system was found to be size-dependent.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Applied
Yucun Liu, Qiang Liu, Xinmiao Wang, Yingying Xie, Yuan Wang
Summary: A facile low-molecular-weight gelator based on 1,8-naphthalimide derivative functionalized by 2-hydroxynaphthalene unit has been synthesized. The gelator exhibited distinct fluorescence emission behavior and could assemble into supramolecular solution aggregates and gel in DMF-H2O mixed solvents. It showed superior selective and sensitive sensing property for Fe3+ with a fluorescence turn-off detection mechanism.
Article
Physics, Applied
Alena Nikolskaya, Alexander Revin, Dmitry Korolev, Alexey Mikhaylov, Vladimir Trushin, Alexey Kudrin, Anton Zdoroveyshchev, Daniil Zdoroveyshchev, Pavel Yunin, Mikhail Drozdov, Anton Konakov, David Tetelbaum
Summary: Ion implantation is a promising method for the development of beta-Ga2O3-based technologies and devices, but the physical principles of ion implantation for this semiconductor are still in the early stage of development. In this study, the electrical parameters of ion-doped layers were investigated, and it was found that the activation efficiency of the implanted impurity significantly exceeds unity after high-temperature annealing. It was also discovered that, in addition to shallow donors, deep defect-associated donors and acceptors exist.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Tianqi Zhu, Hongmei Li, Naoki Takata, Makoto Kobashi, Masataka Yoshino
Summary: The present study investigates the effect of solute Ni element on the plastic deformation and thermal activation process of 18Cr ferritic stainless steels. Compression tests on single-crystal micropillars with different diameters were conducted to determine the strain rate sensitivity and specimen-size dependence of stress. The results show that the addition of Ni reduces the strain rate sensitivity and increases the activation volume.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Ceramics
A. Hussey, R. De Meyere, C. Deck, D. E. J. Armstrong, Y. Zayachuk
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Nanoscience & Nanotechnology
Dominic Spencer Jolly, Ziyang Ning, James E. Darnbrough, Jitti Kasemchainan, Gareth O. Hartley, Paul Adamson, David E. J. Armstrong, James Marrow, Peter G. Bruce
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Materials Science, Multidisciplinary
Alexander J. Leide, Richard I. Todd, David E. J. Armstrong
Article
Materials Science, Multidisciplinary
Kay Song, Suchandrima Das, Abdallah Reza, Nicholas W. Phillips, Ruqing Xu, Hongbing Yu, Kenichiro Mizohata, David E. J. Armstrong, Felix Hofmann
Article
Chemistry, Physical
A. W. Carruthers, B. S. Li, M. Rigby, L. C. Raquet, R. Mythili, C. Ghosh, A. Dasgupta, D. E. J. Armstrong, A. S. Gandy, E. J. Pickering
Summary: Research investigated the potential application of high-entropy alloys in next-generation nuclear reactors, producing two low-activation HEAs and comparing their microstructures to CALPHAD predictions. It was found that there was significant variation in the accuracy of the predictions among CALPHAD databases, particularly in the underprediction of the Laves phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Thomas P. Davis, Jack C. Haley, Sarah Connolly, Maria A. Auger, Michael J. Gorley, Patrick S. Grant, Paul A. J. Bagot, Michael P. Moody, David E. J. Armstrong
MATERIALS CHARACTERIZATION
(2020)
Review
Physics, Multidisciplinary
Ed J. Pickering, Alexander W. Carruthers, Paul J. Barron, Simon C. Middleburgh, David E. J. Armstrong, Amy S. Gandy
Summary: High-entropy alloys (HEAs) offer expanded compositional freedom for advanced nuclear applications, but our understanding of their irradiation responses is still in its infancy. While some studies suggest special irradiation damage resistance in HEAs, proposed mechanisms like sluggish diffusion and lattice distortion are not universally convincing, and unique differences in HEAs compared to conventional alloys may lie in factors like poor thermal conductivities.
Article
Materials Science, Ceramics
Robin M. G. De Meyere, Louise Gale, Stephen Harris, Ian M. Edmonds, Thomas J. Marrow, David E. J. Armstrong
Summary: The study investigated the interfacial shear strength of the BN interphase in SiCf/SiC ceramic matrix composites by varying fiber types and interlayer thicknesses, finding that roughness and local fiber environment play a significant role in the measured interfacial shear strength when the interphase thickness exceeds 200 nm.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
T. P. Davis, M. A. Auger, C. Hofer, P. A. J. Bagot, M. P. Moody, D. E. J. Armstrong
Summary: Ion irradiation was used to study the radiation-induced precipitation and mechanical property changes of commercial-grade T91 ferritic-martensitic steel, showing different precipitates and clusters formed at various doses, and an increase in hardness with radiation dose.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Review
Materials Science, Multidisciplinary
Zhouran Zhang, David E. J. Armstrong, Patrick S. Grant
Summary: High-entropy alloys (HEAs) have potential for intriguing combinations of mechanical and other properties, with focus on irradiation response such as high phase stability and resistance to radiation-induced segregation. The Cantor alloy and its derivatives exhibit encouraging irradiation resistance superior to traditional dilute alloys, showing smaller size but higher number density of dislocation loops, significantly lower extent of swelling and improved resistance to He bubble growth. Future research directions for irradiation resistant HEAs are suggested.
PROGRESS IN MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Kay Song, Hongbing Yu, Phani Karamched, Kenichiro Mizohata, David E. J. Armstrong, Felix Hofmann
Summary: Understanding the mechanisms of plasticity in structural steels is crucial for the operation of next-generation fusion reactors. This study focuses on the deformation behavior of FeCr and aims to differentiate the nucleation process of dislocations for initiating plasticity from their propagation through the material. The results show that the nucleation of dislocations is mainly derived from pre-existing sources and is not significantly affected by the presence of irradiation defects or Cr content.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Multidisciplinary Sciences
Shiteng Zhao, Zezhou Li, Chaoyi Zhu, Wen Yang, Zhouran Zhang, David E. J. Armstrong, Patrick S. Grant, Robert O. Ritchie, Marc A. Meyers
Summary: High-entropy alloys (HEAs) show remarkable material properties under harsh conditions, with structures containing stacking faults, twins, transformation between crystal structures, and amorphization being generated through plastic deformation processes.
Article
Polymer Science
Nicholas T. H. Farr, Sameer F. Hamad, Euan Gray, Christopher M. Magazzeni, Fodio Longman, David E. J. Armstrong, Joel P. Foreman, Frederik Claeyssens, Nicola H. Green, Cornelia Rodenburg
Summary: The distribution of methylene and ether bridges affects the mechanical properties of phenolic resin. This study demonstrates the capability of a novel SEM technique, SEHI, to characterize and map these bridges at the nanoscale within the resin.
Article
Materials Science, Multidisciplinary
T. P. Davis, M. A. Auger, N. Almirall, P. Hosemann, G. R. Odette, P. A. J. Bagot, M. P. Moody, D. E. J. Armstrong
Article
Materials Science, Multidisciplinary
R. J. Scales, D. E. J. Armstrong, A. J. Wilkinson, B-S. Li
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)
