Article
Nanoscience & Nanotechnology
Agnieszka Teresa Krawczynska, Michael Kerber, Przemyslaw Suchecki, Barbara Romelczyk-Baishya, Maciej Oskar Liedke, Maik Butterling, Eric Hirschmann, Andreas Wagner, Malgorzata Lewandowska, Daria Setman
Summary: The impact of high-pressure release after high-pressure torsion on subsequent high-pressure annealing of nanostructured Ni was analyzed. It was found that the applied pressure increased microhardness, reduced grain size, and improved the heterogeneity of the microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Dennis Edgard Jodi, Timothy Alexander Listyawan, Petr Hruska, Jakub Cizek, Nokeun Park, Unhae Lee
Summary: The study utilized positron annihilation spectroscopy to investigate vacancies in Fe-x(CoCrMnNi)(100-x) medium- and high-entropy alloys. It was found that these alloys mainly contain monovacancies with a positron lifetime of approximately 170 ps. Alloys with lower iron content exhibited higher configurational entropy and lower concentration of monovacancies. Additionally, the presence of vacancies was associated with enhanced manganese content in the vicinity.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Jonatan Slotte, Simo Kilpelainen, Natalie Segercrantz, Kenichiro Mizohata, Jyrki Raisanen, Filip Tuomisto
Summary: The unique experimental setup at the Accelerator Laboratory of the University of Helsinki allows for in situ positron annihilation spectroscopy (PAS) analysis on ion irradiated samples, with temperature control. This system provides numerous possibilities for defect identification and annealing studies, but also presents challenges and limitations that need to be addressed.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Article
Physics, Multidisciplinary
Maudud Ahmed, Shubharaj Mukherjee, Tukai Singha, Jay Sharma, P. M. G. Nambissan
Summary: Pure and zinc-doped cadmium oxide nanocrystallites were synthesized using a chemical precipitation method with varying doping concentrations. The sizes of the nanocrystallites decreased with increasing substitution due to the smaller ionic radii of Zn2+. Interfacial defects were formed at higher doping concentrations due to the different crystalline structures of ZnO and CdO. Characterization was done through X-ray diffraction patterns, transmission electron microscopy, and optical band gap measurements. The results showed well-defined peaks, substitution-induced disorder, and a decrease in band gap energies. The segregation of ZnO phase hindered the success of continued substitution.
Article
Materials Science, Multidisciplinary
Martin Stueckler, Lukas Weissitsch, Stefan Wurster, Heinz Krenn, Reinhard Pippan, Andrea Bachmaier
Summary: This study investigates the formation of solid solutions of Cu, Fe, and Co through high-pressure torsion, aiming at synthesizing soft magnetic materials with a homogeneous and nanocrystalline microstructure. Different processing conditions lead to either single-phase supersaturated solid solutions or nanocomposites, depending on the Co-to-Fe ratio. The resulting microstructure exhibits enhanced magnetic properties and remains stable at temperatures up to 400 degrees C.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Franziska Staab, Enrico Bruder, Lukas Scha, Konstantin Skokov, David Koch, Benjamin Zingsem, Esmaeil Adabifiroozjaei, Leopoldo Molina-Luna, Oliver Gutfleisch, Karsten Durst
Summary: Textured nanocrystalline SmCo5-Cu magnets are produced by high-pressure torsion (HPT) of powder blends consisting of SmCo5 and Cu powder. The process overcomes limitations imposed by the phase diagram as in conventional sintering routes, enabling a free selection of the magnetic phase and the grain boundary phase. Increasing number of rotations during HPT leads to structural refinement, increasing coercivity, and amorphous structure of strongly deformed SmCo5 particles. The magnetic hardening is attributed to microstructural refinement and magnetic decoupling of hard magnetic SmCo5 grains by Cu.
Article
Nanoscience & Nanotechnology
Hamed Shahmir, Peyman Asghari-Rad, Mohammad Sajad Mehranpour, Farsad Forghani, Hyoung Seop Kim, Mahmoud Nili-Ahmadabadi
Summary: High-pressure torsion on an equiatomic CoCrFeNiMn high entropy alloy at room and cryogenic temperatures induces FCC to HCP and BCC martensitic transformations, effectively strengthening the alloy through increasing straining and decreasing deformation temperature. This transformation plays a significant role in altering the mechanical properties of the alloy under different deformation conditions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Andrey Volokitin, Abdrakhman Naizabekov, Irina Volokitina, Sergey Lezhnev, Evgeniy Panin
Summary: The study shows that severe plastic deformation by the HPT method plays a favorable role in increasing the degree of grain refining of AISI-316 steel, which directly benefits the mechanical properties of the material.
Article
Chemistry, Multidisciplinary
Maudud Ahmed, Shubharaj Mukherjee, Tukai Singha, P. M. G. Nambissan
Summary: In this study, cadmium oxide nanocrystallites with sizes ranging from 16 nm to 30 nm were synthesized via a chemical precipitation method at different synthesis temperatures. X-ray diffraction analysis confirmed the absence of mixed or impurity phases. The samples exhibited quantum confinement effects, as demonstrated by the variation in band gap energies measured by optical absorption. The presence of defects, such as non-stoichiometric defects, was found to greatly influence the properties of the nanocrystallites, and their concentration was quantified using positron annihilation studies.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Luca Chiari, Kenji Kojima, Yusuke Endo, Hiroki Teshigahara, Maik Butterling, Maciej Oskar Liedke, Eric Hirschmann, Ahmed G. Attallah, Andeas Wagner, Masanori Fujinami
Summary: The formation and evolution of hydrogen-induced defects in nickel were investigated using positron annihilation lifetime spectroscopy, revealing that hydrogen addition at room temperature can lead to the formation of a large number of atomic vacancies. These defects in nickel agglomerate into large vacancy clusters during room temperature aging, demonstrating the primary role of hydrogen in the formation and stabilization of vacancies.
Article
Instruments & Instrumentation
Kiminori Sato, Kenji Ito
Summary: Plasma treatment is an effective method to enhance the optical properties of glass by creating an implanted layer that can absorb and reflect specific wavelengths of light, making it suitable for various materials.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Chemistry, Physical
Gerda Rogl, Oliver Renk, Sanyukta Ghosh, Ramesh Chandra Mallik, Andriy Grytsiv, Jiri Bursik, Erhard Schafler, Filip Tuomisto, Ernst Bauer, Peter Franz Rogl
Summary: The study investigates the influence of shear strain on the microstructural, physical, and mechanical properties of bulk samples consolidated by high-pressure torsion, finding that as shear strain increases, electrical resistivity rises while thermal conductivity decreases. Moreover, the Seebeck coefficient remains largely unchanged.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Ceramics
Divyesh Barad, Priya L. Mange, Komal K. Jani, Shubharaj Mukherjee, Maudud Ahmed, Sudhish Kumar, Satya N. Dolia, Rabia Pandit, Pooja Y. Raval, Kunal B. Modi, P. M. G. Nambissan
Summary: A series of quadruple perovskites Ca1+xCu3-xTi4O12 were scanned using various spectroscopic and microscopic techniques, revealing a transformation from mono- to biphasic system upon Ca2+ substitution. Differences in grain morphology, UV-visible absorption band, and Raman scattering peak were observed, attributed to mismatch in ion and site radii leading to defect formation. The results from positron annihilation spectroscopy confirmed the presence of vacancy-type defects, with their size and concentration characterized through measured positron lifetimes and coincidence Doppler broadening. Additionally, the formation of a secondary phase for x=0.1 was suggested based on the findings.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Paula C. de Oliveira, Luciano A. Montoro, Maria Teresa Perez-Prado, Anton Hohenwarter, Roberto B. Figueiredo, Augusta Isaac
Summary: The study found that Nd readily segregates along boundaries in the early stages of severe plastic deformation of the magnesium alloy, while Mn forms nanoparticles and segregates along boundaries. As the strain increases, the hardness of the alloy rapidly increases and saturates, suggesting that the contribution of Mn to the strength of the alloy is minimal.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Review
Materials Science, Multidisciplinary
Shiv Prakash Singh, Mahmoud Ebrahimi, Shokouh Attarilar, Liqiang Wang, Qudong Wang, Faramarz Djavanroodi
Summary: Metallic glasses, known as amorphous and metastable materials, possess superior mechanical properties compared to crystalline materials. The severe plastic deformation (SPD) method has been used to enhance the ductility of these glasses, resulting in improved properties. Recent research on nanostructured metallic glasses has shown that properties such as mechanical, thermal, and magnetic have been enhanced compared to bulk metallic glass.
FRONTIERS IN MATERIALS
(2022)
Article
Chemistry, Physical
Artem Musiienko, Jakub Cizek, Hassan Elhadidy, Petr Praus, Kate Higgins, Bogdan Dryzhakov, Andrii Kanak, Franck Sureau, Jindrich Pipek, Eduard Belas, Marian Betusiak, Mykola Brynza, Eric Lukosi, Bin Hu, Mahshid Ahmadi
Summary: The study found that both hybrid and all-inorganic MHPs exhibit low concentrations of vacancies regardless of their synthesis method, with crystals grown from solution prone to solvent inclusion during synthesis.
CHEMISTRY OF MATERIALS
(2022)
Review
Materials Science, Multidisciplinary
Kaveh Edalati, Andrea Bachmaier, Victor A. Beloshenko, Yan Beygelzimer, Vladimir D. Blank, Walter J. Botta, Krzysztof Bryla, Jakub Cizek, Sergiy Divinski, Nariman A. Enikeev, Yuri Estrin, Ghader Faraji, Roberto B. Figueiredo, Masayoshi Fuji, Tadahiko Furuta, Thierry Grosdidier, Jeno Gubicza, Anton Hohenwarter, Zenji Horita, Jacques Huot, Yoshifumi Ikoma, Milos Janecek, Megumi Kawasaki, Petr Kral, Shigeru Kuramoto, Terence G. Langdon, Daniel R. Leiva, Valery Levitas, Andrey Mazilkin, Masaki Mito, Hiroyuki Miyamoto, Terukazu Nishizaki, Reinhard Pippan, Vladimir V. Popov, Elena N. Popova, Gencaga Purcek, Oliver Renk, Adam Revesz, Xavier Sauvage, Vaclav Sklenicka, Werner Skrotzki, Boris B. Straumal, Satyam Suwas, Laszlo S. Toth, Nobuhiro Tsuji, Ruslan Z. Valiev, Gerhard Wilde, Michael J. Zehetbauer, Xinkun Zhu
Summary: This article comprehensively reviews recent advances in the development of ultrafine-grained and nanostructured materials through severe plastic deformation and provides a brief history of this field. Severe plastic deformation methods have been effective in producing materials with advanced mechanical and functional properties, and the field of NanoSPD has experienced significant progress in the past two decades.
MATERIALS RESEARCH LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Wanchai Deeloed, Tatiana Priamushko, Jakub Cizek, Songwut Suramitr, Freddy Kleitz
Summary: In this study, defect-rich ordered mesoporous spinel oxides were developed as bifunctional electrocatalysts for oxygen reduction and evolution reactions (ORR and OER). Chemical treatment with a NaBH4 solution enhanced the defect concentration and contributed to improved catalytic activity. The results provide insights into the development of highly active electrocatalysts through defect engineering methods.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Michal Leibner, Martin Vlach, Veronika Kodetova, Hana Kudrnova, Jozef Vesely, Sebastien Zikmund, Jakub Cizek, Oksana Melikhova, Frantisek Lukac
Summary: The effect of cold-rolling and high-temperature aging on precipitation processes in an Al-Er-Zr alloy was investigated. Based on the results, the decomposition sequence of the supersaturated solid solution was proposed. Cold-rolling enhances the precipitation of Al3Er particles and accelerates the formation of the Zr-rich shell around the Er-rich core. The coherency strain-field around the precipitates is retained even after 4 hours of aging at 600℃.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Jakub Cizek, Tomas Vlasak, Oksana Melikhova
Summary: Lattice defects in refractory metal high-entropy alloy HfNbTaTiZr were investigated using positron lifetime spectroscopy and coincidence Doppler broadening spectroscopy. The results showed that annealing the alloy at 1000 degrees C resulted in the full recovery of defects and the formation of a single-phase random solid solution. Quenching the alloy from high temperature prevented the recovery of thermally equilibrium vacancies and maintained a high concentration of vacancies at ambient temperature. The study also revealed that vacancies in the alloy were preferentially coupled with Hf solutes.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Tomas Vlasak, Jakub Cizek, Oksana Melikhova, Frantisek Lukac, Dalibor Preisler, Milos Janecek, Petr Harcuba, Mariia Zimina, Ondrej Srba
Summary: In this study, a series of high-entropy alloys based on refractory metals were systematically investigated. It was found that a bcc single-phase solid solution can be formed at high temperatures, but phase separation occurs at lower temperatures. However, a metastable single-phase solid solution can be preserved at room temperature through rapid cooling. Moreover, the mechanical properties of annealed and as-cast alloys were found to be comparable.
Article
Chemistry, Physical
Lenka Volfova, Stefan Andrei Irimiciuc, Sergii Chertopalov, Petr Hruska, Jakub Cizek, Martin Vondracek, Michal Novotny, Maik Butterling, Maciej Oskar Liedke, Andreas Wagner, Jan Lancok
Summary: The influence of oxygen pressure on the structural and physical properties of various copper oxide phases grown by Pulsed Laser Deposition (PLD) on MgO (100) was investigated. Positron annihilation spectroscopy revealed the presence of positrons trapped at vacancies and large vacancy clusters with lifetimes ranging from 400 ps to 500 ps. Single copper vacancies were found in the CuO phase, while copper vacancy complexes coupled with oxygen vacancies were observed in the Cu2O phase. Suitable O-2 atmosphere conditions that induced a mixture of copper oxide phases were identified. In situ diagnostic techniques based on Optical Emission Spectroscopy and Langmuir Probe were used to monitor the deposition process and correlate with film properties.
APPLIED SURFACE SCIENCE
(2023)
Article
Astronomy & Astrophysics
Jan Wild, Jakub Cizek, Libor Nouzak, Jiri Pavlu, Jana Safrankova, Zdenek Nemecek, Jakub Vaverka, Dalibor Nosek, Tomas Burian, Anna Wildova, Jan Broulim
Summary: We present the first laboratory experiment investigating the interaction between a cosmic dust simulant and positrons emitted from a Na-22 radioisotope. By accurately measuring the charge of micrometer-sized SiO2 dust grains, we observed +1 e steps, indicative of positron annihilation inside the grain. The rate of these charging events aligns well with predictions from a model based on the continuous slowing down approximation of energetic positrons within the grain. Additionally, we attributed less frequent charging steps larger than +1 e to the emission of secondary electrons during the positron slowing down process. The coefficient of secondary electron emission was found to be approximately inversely proportional to the grain radius. Based on our experimental findings, we propose a potential scenario for charging in interstellar dark clouds.
ASTROPHYSICAL JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Pavel Zhanal, TomiS Krajnak, Mariia Zimina, Alica Fedorikova, Ondrej Srba, Petr Harcuba, Josef Strasky, Milos Janecek
Summary: The influence of neutron irradiation on the microstructure and mechanical properties of Ti Grade 2 in coarse- and ultrafine-grained conditions was studied. It was found that neutron irradiation significantly affected the mechanical properties of the coarse-grained state, while the ultrafine-grained state exhibited higher radiation resistance.
Article
Materials Science, Multidisciplinary
O. Zivotsky, Y. Jiraskova, J. Bursik, D. Janickovic, J. Cizek
Summary: The structure and magnetic properties of Mn2FeSi alloy, a potential Heusler material, were studied using rapid solidification technology. It was found that the as-prepared Mn2FeSi ribbon exhibited paramagnetism at room temperature and had a cubic structure with a lattice parameter of 0.567 nm. The presence of other phases at low temperatures affected the structural and physical properties of the sample after annealing.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jan Zich, Martin Misek, Vaclav Holy, Karel Carva, Jakub Cizek, Jiri Navratil, Patrik Cermak, Petr Knotek, Katerina Cermak Sraitrova, Stanislav Cichon, Jiri Hejtmanek, Zdenek Jirak, Cestmir Drasar
Summary: Fe-intercalated Bi2Se3 single crystals exhibit unique physical properties, including superconductivity, pronounced Shubnikov-de Haas oscillations, and high carrier mobility. These properties are correlated with the structural properties and point defects of the crystals. The study suggests that the inhomogeneous distribution of defects in the sample volume may be responsible for the interesting properties of Bi2Se3.
Article
Materials Science, Multidisciplinary
Marc Wenskat, Jakub Cizek, Maciej Oskar Liedke, Maik Butterling, Martin Stiehl, Guilherme Dalla Lana Semione, Constanze Backes, Christopher Bate, Oksana Melikhova, Eric Hirschmann, Andreas Wagner, Hans Weise, Andreas Stierle, Martin Aeschlimann, Wolfgang Hillert
Summary: Superconducting radio-frequency (SRF) cavities have shown potential as qubits for quantum computing and are crucial components in modern particle accelerators. Recent research has found that temperature treatment can improve their performance by reorganizing the niobium oxide and near-surface vacancy structure.
Article
Nanoscience & Nanotechnology
Jie Zhang, Xiaoyang Chen, MingJian Ding, Jiaqiang Chen, Ping Yu
Summary: This study enhances the compositional inhomogeneity of relaxor ferroelectric thin films to improve their dielectric temperature stability. The prepared films exhibit a relatively high dielectric constant and a very low variation ratio of dielectric constant over a wide temperature range.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xiaoyu Chen, Ranran Zhang, Hao Zou, Ling Li, Qiancheng Zhu, Wenming Zhang
Summary: Polyaniline-manganese dioxide composites exhibit high conductivity, long discharge platform, and stable circulation, and the specific capacity is increased by providing additional H+ ions to participate in the reaction.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xutao Huang, Yinping Chen, Jianjun Wang, Gang Lu, Wenxin Wang, Zan Yao, Sixin Zhao, Yujie Liu, Qian Li
Summary: This study aims to establish a novel approach to better understand and predict the behavior of materials with multi-scale lamellar microstructures. High-resolution reconstruction and collaborative characterization methods are used to accurately represent the microstructure. The mechanical properties of pearlite are investigated using crystal plasticity simulation and in-situ scanning electron microscopy tensile testing. The results validate the reliability of the novel strategy.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Cheng Chen, Fanchao Meng, Jun Song
Summary: This study systematically investigated the unfaulting mechanism of single-layer interstitial dislocation loops in irradiated L12-Ni3Al. The unfaulting routes of the loops were uncovered and the symmetry breaking during the unfaulting processes was further elucidated. A continuum model was formulated to analyze the energetics of the loops and predict the unfaulting threshold.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Darshan Bamney, Laurent Capolungo
Summary: This work investigates the formation of adjoining twin pairs (ATPs) at grain boundaries (GBs) in hexagonal close-packed (hcp) metals, focusing on the co-nucleation (CN) of pairs of deformation twins. A continuum defect mechanics model is proposed to study the energetic feasibility of CN of ATPs resulting from GB dislocation dissociation. The model reveals that CN is preferred over the nucleation of a single twin variant for low misorientation angle GBs. Further analysis considering GB character and twin system alignment suggests that CN events could be responsible for ATP formation even at low m' values.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Bing Han, Zhengqian Fu, Guoxiang Zhao, Xuefeng Chen, Genshui Wang, Fangfang Xu
Summary: This study investigates the behavior of electric-field induced antiferroelectric to ferroelectric (AFE-FE) phase transition and reveals the evolution of atomic displacement ordering as the cause for the transition behavior changing from sharp to diffuse. The novel semi-ordered configuration results from the competing interaction between long-range displacement modulation and compositional inhomogeneity, which leads to a diffuse AFE-FE transition while maintaining the switching field.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Akib Jabed, Golden Kumar
Summary: This study demonstrates that cryogenic rejuvenation promotes homogeneous-like flow and increases ductility in metallic glass samples. Conversely, annealing has the opposite effect, resulting in a smoother fracture surface.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xin Ji, Yan Chong, Satoshi Emura, Koichi Tsuchiya
Summary: A heterogeneous microstructure in Ti-15Mo-3Al alloy with heterogeneous distributions of Mo element and omega(iso) precipitates has achieved a four-fold increase in tensile ductility without a loss of tensile strength, by blocking the propagation of dislocation channels and preventing the formation of micro-cracks.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Amit Samanta, Prasanna Balaprakash, Sylvie Aubry, Brian K. Lin
Summary: This study proposes a combined large-scale first principles approach with machine learning and materials informatics to quickly explore the chemistry-composition space of advanced high strength steels (AHSS). The distribution of aluminum and manganese atoms in iron is systematically explored using first principles calculations to investigate low stacking fault energy configurations. The use of an automated machine learning tool, DeepHyper, speeds up the computational process. The study provides insights into the distribution of aluminum and manganese atoms in systems containing stacking faults and their effects on the equilibrium distribution.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Guowei Zhou, Yuanzhe Hu, Zizheng Cao, Myoung Gyu Lee, Dayong Li
Summary: In this work, a physics-constrained neural network is used to predict grain-level responses in FCC material by incorporating crystal plasticity theory. The key feature, shear strain rate of slip system, is identified based on crystal plasticity and incorporated into the loss function as physical constitutive equations. The introduction of physics constraints accelerates the convergence of the neural network model and improves prediction accuracy, especially for small-scale datasets. Transfer learning is performed to capture complex in-plane deformation of crystals with any initial orientations, including cyclic loading and arbitrary non-monotonic loading.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Pengfei Yang, Qichang Li, Zhongying Wang, Yuxiao Gao, Wei Jin, Weiping Xiao, Lei Wang, Fusheng Liu, Zexing Wu
Summary: In this study, the HER performance of Ru-based catalysts is significantly improved through the dual-doping strategy. The obtained catalyst exhibits excellent performance in alkaline freshwater and alkaline seawater, and can be stably operated in a self-assembled overall water splitting electrolyzer.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Ilias Bikmukhametov, Garritt J. Tucker, Gregory B. Thompson
Summary: Depositing a Ni-1at. % P film can facilitate the formation of multiple quintuple twin junctions, resulting in a five-fold twin structure and a pentagonal pyramid surface topology. The ability to control material structures offers opportunities for creating novel surface topologies, which can be used as arrays of field emitters or textured surfaces.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Zening Yang, Weiwei Sun, Zhengyu Sun, Mutian Zhang, Jin Yu, Yubin Wen
Summary: Multicomponent oxides (MCOs) have wide applications and accurately predicting their thermal expansion remains challenging. This study introduces an innovative attention-based deep learning model, which achieves improved performance by using two self-attention modules and demonstrates adaptability and interpretability.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Ze Liu, Cai Chen, Yuanxun Zhou, Lanting Zhang, Hong Wang
Summary: This study attempts to address the gap in cooling rates between thin film deposition and bulk metallic glass (BMG) casting by correlating the glass-forming range (GFR) determined from combinatorial materials chips (CMCs) with the glass-forming ability (GFA) of BMG. The results show that the full-width at half maximum (FWHM) of the first sharp diffraction peak (FSDP) is a good indicator of BMG GFA, and strong positive correlations between FWHM and the critical casting diameter (Dmax) are observed in various BMG systems. Furthermore, the Pearson correlation coefficients suggest possible similarities in the GFA natures of certain BMG pairs.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Mike Schneider, Jean-Philippe Couzinie, Amin Shalabi, Farhad Ibrahimkhel, Alberto Ferrari, Fritz Koermann, Guillaume Laplanche
Summary: This work aims to predict the microstructure of recrystallized medium and high-entropy alloys, particularly the density and thickness of annealing twins. Through experiments and simulations, a database is provided for twin boundary engineering in alloy development. The results also support existing theories and empirical relationships.
SCRIPTA MATERIALIA
(2024)
