Article
Materials Science, Multidisciplinary
Jiangnan Li, Hossein Sepehri-Amin, Taisuke Sasaki, Tadakatsu Ohkubo, Kazuhiro Hono
Summary: The coercivity of commercial magnets is typically around 0.2 H-A, known as Brown's paradox, but recent studies have shown that the magnetism of a thin layer along grain boundaries plays a critical role in influencing the coercivity of magnets. By using various microstructure characterization techniques and simulation models, researchers are working towards improving the coercivity of Nd-Fe-B magnets to its limit.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ming-Gang Zhu, Yan-Feng Li, Wei Li, Li-Yun Zheng, Dong Zhou, Hai-Bo Feng, Lang Chen, An Du
Summary: This study investigates the relationship between the microstructure and magnetic properties of Nd-Fe-B sintered magnets compressed by shock wave with 6.26 GPa <= p <= 7.16 GPa. It is found that the magnets show demagnetization behavior after being compressed by shock wave, with intergranular fracture being the main phenomenon. The coercivity of the compressed magnets can be restored through annealing, suggesting that only morphological changes, such as intergranular fracture, occur without structural changes in the grain boundary phase. Factors such as matrix phase grain interconnection, microcracks and pores, and alterant orientation relationship between matrix phase and grain boundaries phase are considered to induce demagnetization.
Article
Materials Science, Multidisciplinary
Yuye Wu, Konstantin P. Skokov, Lukas Schafer, Fernando Maccari, Alex Aubert, Hao Xu, Haichen Wu, Chengbao Jiang, Oliver Gutfleisch
Summary: We report on the microstructure, hard magnetic properties, and thermal stability of hot-compacted nanocrystalline (Nd0.85Ce0.15)15(Fe1-xCox)7(8)B(7) permanent magnets. The substitution of Fe by Co influences the grain boundary phase composition and degrades the coercivity at lower Co concentrations (x < 0.3). At higher Co concentrations (x >= 0.6), the absence of a grain boundary phase leads to strong magnetic coupling. Additional RE(Fe,Co)2, RE(Fe,Co)4B, and RECo5 phases gradually form with increasing Co concentration (x > 0.6). A new type of microstructure with nanograins and good thermal stability is observed at x = 0.4 and 0.6. In (Nd0.85Ce0.15)(15)(Fe0.4Co0.6)78B-7 magnets, the temperature coefficient of coercivity exceeds 0.3%/K within the temperature range of 300 K-500 K and 0.23%/K for the temperature range of 300 K-650 K, demonstrating the potential for designing highly thermal-stable permanent magnets.
Article
Chemistry, Physical
Shuwei Zhong, Munan Yang, Hang Wang, Sajjad Ur Rehman, Xi Yu, Sangen Luo, Longgui Li, Chao Li, Shuhua Xiong, Bin Yang
Summary: In this study, submicron Al, Sn, Zn metal powders were introduced into the precursor powder to improve the infiltration effect and enhance the grain boundary diffusion depth and efficiency of sintered Nd-Fe-B magnets. The addition of Al, Sn, and Zn elements decreased the transformation temperature of the Nd-rich phase and improved the microstructure, promoting the diffusion of Tb into the 2:14:1 phase. The intrinsic coercivity of Al-, Sn-, and Zn-added magnets also increased significantly.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Yuheng Xie, Shuai Cao, Xuejing Cao, Tengfei Wu, Mingpeng Kou, Zhi Jia, Guangfei Ding, Shuai Guo, Renjie Chen, Xincai Liu, Aru Yan, Zhiyi Xu
Summary: This study systematically investigated the magnetic properties and microstructures of sintered Nd-Fe-B magnets with different Nd-Cu powder additions and their corresponding diffused magnets using Tb-Cu alloys. The results showed that the enhancement of coercivity after diffusion was positively correlated with the intergranular phase proportion of the base substrates. Furthermore, the analysis of microstructures revealed that the higher coercivities were mainly attributed to the deeper diffusion depths of Tb elements and the presence of Nd-rich grain boundary phases in the base substrates, which facilitated the diffusion process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Z. Wang, T. T. Sasaki, Y. Une, T. Ohkubo, K. Hono
Summary: Record-breaking high coercivity is achieved in Dy-free sintered magnets by separately diffusing Dy70Cu30 and Pr68Cu32 eutectic alloys. The low Dy content sample exhibits a high coercivity of 2.8 T and an excellent temperature coefficient of coercivity. The unique presence of a uniform Dy-rich shell and enriched Pr near the surface of Nd2Fe14B grains strengthens the anisotropy field, resulting in the high coercivity without alloying Dy to the initial magnet.
Article
Chemistry, Physical
Zhanjia Wang, Yuqing Li, Haihui Wu, Ming Ji, Hongguo Zhang, Weiqiang Liu, Ming Yue
Summary: Grain boundary diffusion (GBD) Nd-Fe-B sintered magnets were prepared using a newly developed solid-liquid phase separation diffusion (SepD) technique and a currently popular solid-liquid phase simultaneous diffusion (SimD) technique. The magnetic properties, microstructures, and magnetic domain morphologies of the magnets diffused with different Tb contents using the two techniques were investigated. The SepD magnet with 0.25 wt% Tb exhibited similar coercivity and a stronger maximum energy product compared to the SimD magnet with 0.50 wt% Tb, showing higher Tb availability. Moreover, the new diffusion technique allowed Tb to diffuse deeper into the magnet and distribute more homogeneously around the surface region of the Nd2Fe14B crystal grains, forming the crucial core-shell structure without undesired enrichment in the surface area of the magnet. As a result, the squareness factor significantly increased from 0.842 for the SimD magnet to 0.925 for the SepD magnet with a thickness of 8 mm.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Hao Zhan, Yinan Wang, Chuanxiao Peng, Juntao Yu, Zilong Wang, Jiakai Hu, Xinyuan Bai, Yang Luo, Li Wang
Summary: To improve the diffusion characteristics of heavy rare earth in the grain boundary, the effects of diffusion process and the ratio of Tb and Cu during the layered deposition process on the magnetic properties of Tb-Cu diffused Nd-Fe-B magnets were systematically investigated. The coercivity of the diffused magnet was most enhanced with RTb/Cu = 4:1, increasing from 10.86 kOe to 21.80 kOe. Cu significantly improved the composition homogenization of diffused magnets. The highest utilization efficiency of Tb reached 43.96 kOe/wt% in the designed diffused magnet. Moreover, the reduced demagnetization risk of sintered Nd-Fe-B magnets was verified using finite element method based on the experimental temperature characteristics of the magnet. (c) 2023 Elsevier B.V. All rights reserved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Dan Wu, Wei-Qiang Liu, Ming Yue, Qiong Wu, Dong-Tao Zhang, Qing-Mei Lu, Xu-Liang Li, Jing-Wu Chen
Summary: The coercivity, microstructure, and magnetic domain structure of Nd-Fe-B sintered magnets by grain boundary diffusion process (GBDP) with TbH3 nanoparticles were systematically investigated. The analysis showed that a core-shell structure can increase coercivity and identified the presence of both GR and AR through magnetic domain structure analysis.
Article
Materials Science, Multidisciplinary
Yuye Wu, Konstantin P. Skokov, Lukas Schafer, Fernando Maccari, Alex Aubert, Ziyuan Rao, Kevin Schweinar, Baptiste Gault, Hao Xu, Chengbao Jiang, Oliver Gutfleisch
Summary: In this study, the similarities and differences between Nd-Fe-B and Nd-Co-B magnets were investigated. It was found that the microstructure and origin of the high coercive state in Nd-Co-B magnets, unlike Nd-Fe-B magnets, have been less studied. Nd-Co-B magnets consist of multiple exchange-coupled ferromagnetic phases.
Article
Chemistry, Physical
Fugang Chen, Tieqiao Zhang, Yong Zhao, Xiaoli Wang, Caiping Jiang, Jinlu Chen, Wenqiang Zhao
Summary: The demagnetization field distribution of magnetized Nd-Fe-B magnet was quantitatively calculated and analyzed. Multilayered composite Nd-Fe-B magnets were designed and fabricated with specific coercivity gradient distributions lower than the demagnetization field gradient. It was found that the low coercivity interlayer magnets did not significantly decrease the overall magnetic properties, and effective self-bonding was observed between adjacent Nd-Fe-B magnets.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Zhanjia Wang, Ming Yue, Weiqiang Liu, Yuqing Li, Haihui Wu, Youhao Liu, Shanshun Zha, Xiaofei Yi, Dongtao Zhang, Qingmei Lu, Hongguo Zhang
Summary: A new solid-liquid phase separation diffusion method was reported in this study, which significantly enhanced the permanent magnetic performance of Nd-Fe-B magnets, particularly the demagnetization curve squareness, by avoiding the evident Tb gradient commonly seen in current GBD magnets.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Shuhan Dong, Xiantao Li, Qingmei Lu, Weiqiang Liu, Yufeng Wu, Ming Yue
Summary: The efficient regeneration of sintered Nd-Fe-B rare earth magnets plays a crucial role in the recycling economy of rare earth resources. This study systematically investigated the mechanical properties of the original and recycled magnets and analyzed the chemical composition and microstructure to explain the mechanism. The main fracture mechanism of recycled magnets is intergranular fracture. The regenerated magnets have similar mechanical properties to the original magnets, fully meeting product requirements.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xianshuang Xia, Xu Tang, Yeyuan Du, Haichen Wu, Jinyun Ju, Lian Wu, Renjie Chen, Wenzong Yin, Lanting Zhang, Aru Yan
Summary: High coercivities and excellent thermal stability were achieved in hot-deformed Nd-Fe-B magnets through intergranular addition of alloy powders, with a low consumption of rare-earth elements.
Article
Chemistry, Applied
Min Zhao, Na Liu, Xu Tang, Renjie Chen, Jinyun Ju, Wenzong Yin, Yeyuan Du, Aru Yan, Xincai Liu, Jing Pan, Zhiyi Xu
Summary: Grain boundary diffusion process (GBDP) has been applied to sintered Nd-Fe-B magnets to improve the utilization efficiency of heavy rare earth elements. Recent research shows that GBDP also has potential for enhancing the performance of hot-deformed Nd-Fe-B magnets. This review provides a comprehensive overview of the development and magnetic property enhancement mechanisms of different diffusion methods on hot-deformed magnets, and discusses the room for further property enhancement and the associated challenges of GBDP.
JOURNAL OF RARE EARTHS
(2023)
Article
Physics, Applied
Pelin Tozman, Hossein Sepehri-Amin, Xin Tang, Tadakatsu Ohkubo, Kazuhiro Hono
Summary: Substitution of Co for Fe in SmFe12-based compounds realizes large saturation magnetization. This study successfully reduces the concentration of Co while maintaining a large magnetic moment in the compound. Additionally, (Sm0.8Y0.2)Fe12-based compounds exhibit superior magnetic properties compared to Nd2Fe14B.
APPLIED PHYSICS EXPRESS
(2022)
Article
Physics, Applied
S. Kusaka, T. T. Sasaki, K. Sumida, S. Ichinokura, S. Ideta, K. Tanaka, K. Hono, T. Hirahara
Summary: Superlattice films composed of Bi-2 bilayers and Bi2Te3 quintuple layers were fabricated by annealing pure Bi2Te3 films. Two distinct stoichiometric phases were formed, Bi1Te1 (QL-BL-QL) and Bi4Te3 (QL-BL), and the surface-state dispersion was measured to analyze the topological nature of each sample.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
H. Sepehri-Amin, Xin Tang, T. Ohkubo, K. Hono
Summary: Understanding the magnetization reversal processes of permanent magnets is essential for developing magnets with high coercivity. Recent studies have used magneto-optical Kerr effect microscopy to observe the dynamic magnetic domains under an external magnetic field. Different microstructural features, such as grain boundaries and interfaces, influence the magnetization reversal processes of Nd-Fe-B-based permanent magnets. By manipulating these factors, it is possible to achieve magnets with higher coercivity.
Article
Nanoscience & Nanotechnology
D. Demirskyi, H. Sepehri-Amin, T. S. Suzuki, K. Yoshimi, O. Vasylkiv
Summary: The temperature dependence of flexural strength in sintered boron carbide was investigated. At temperatures above 2000 degrees C, B4C displayed remarkably high flexural strength and a transition from brittle fracture to plastic deformation. Scanning transmission electron microscopy analysis revealed that the observed plasticity in B4C at high temperatures originated from microstructural amorphization.
SCRIPTA MATERIALIA
(2022)
Article
Multidisciplinary Sciences
Xin Tang, H. Sepehri-Amin, N. Terada, A. Martin-Cid, I Kurniawan, S. Kobayashi, Y. Kotani, H. Takeya, J. Lai, Y. Matsushita, T. Ohkubo, Y. Miura, T. Nakamura, K. Hono
Summary: The authors demonstrate a series of materials with a large and reversible magnetocaloric effect, suitable for the full temperature range required for hydrogen liquefaction. By eliminating the magneto-structural phase transition, the giant magnetocaloric effect becomes reversible.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Kazuho Okada, Akinobu Shibata, Taisuke Sasaki, Hisashi Matsumiya, Kazuhiro Hono, Nobuhiro Tsuji
Summary: This study aimed to improve the resistance against hydrogen embrittlement by increasing the concentration of carbon segregated at prior austenite grain boundary (PAGB), XPAGB, in low-carbon martensitic steels. The specimens with and without carbon segregation treatment (Non-seg and Seg specimens, respectively) had similar microstructures, except for higher XPAGB in the Seg specimen. The Seg specimen exhibited higher maximum stress and smaller fraction of intergranular fracture surface under hydrogen-charged conditions, indicating that segregated carbon suppressed hydrogen accumulation and increased cohesive energy of PAGB.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
T. T. Sasaki, J. Y. Lin, P. Yi, Z. H. Li, S. E. Prameela, A. Park, E. Lipkin, A. Lee, M. L. Falk, T. P. Weihs, K. Hono
Summary: In this study, the deformation-induced precipitation of G.P. zones in Mg-9Al and Mg-5 Zn alloys during equal channel angular extrusion has been reported. Atom probe tomography and hybrid molecular dynamics/Monte Carlo simulations suggest that strategic control of atomic-scale defects can generate novel microstructures, thereby strengthening the deformed Mg alloys.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Makoto Takeuchi, Motohiro Suzuki, Shintaro Kobayashi, Yoshinori Kotani, Tetsuya Nakamura, Nobuaki Kikuchi, Anton Bolyachkin, Hossein Sepehri-Amin, Tadakatsu Ohkubo, Kazuhiro Hono, Yasuhiro Une, Satoshi Okamoto
Summary: In this study, three-dimensional magnetic microscopy and electron microscopy techniques were used to investigate the magnetic domain structure of a high-coercivity Nd-Fe-B permanent magnet. The study revealed differences in magnetic domain structures between different magnetization states, but with the same periodicity. Unexpected magnetic domain behaviors were also observed.
NPG ASIA MATERIALS
(2022)
Article
Microscopy
Sujin Lee, Atsuko Sato, Takehiro Tamaoka, Kunio Yubuta, Mitsunari Auchi, Taisuke Sasaki, Tadakatsu Ohkubo, Kazuhiro Hono, Yasukazu Murakami
Summary: This paper proposes a method using electron holography to provide a phase image of the demagnetization field (H-d) within a thin-foil permanent magnet. The observation of H-d remains challenging because electron holography can only image the magnetic flux density (B), which is a combination of contributions from magnetization (M), stray magnetic field (H-s) outside the specimen, and H-d inside the specimen. The phase map approximating H-d, determined from electron holography observation of a Nd2Fe14B single-crystalline specimen, shows good agreement with micromagnetic theory's prediction. This method can be applied to study the coercivity mechanism of permanent magnets, which is sensitive to the demagnetization field.
Article
Materials Science, Multidisciplinary
Z. Wang, T. T. Sasaki, Y. Une, T. Ohkubo, K. Hono
Summary: Record-breaking high coercivity is achieved in Dy-free sintered magnets by separately diffusing Dy70Cu30 and Pr68Cu32 eutectic alloys. The low Dy content sample exhibits a high coercivity of 2.8 T and an excellent temperature coefficient of coercivity. The unique presence of a uniform Dy-rich shell and enriched Pr near the surface of Nd2Fe14B grains strengthens the anisotropy field, resulting in the high coercivity without alloying Dy to the initial magnet.
Article
Chemistry, Physical
Z. H. Kautsar, H. Sepehri-Amin, Xin Tang, R. Iguchi, K. Uchida, T. Ohkubo, K. Hono
Summary: The resistivities of anisotropic Nd-Fe-B-based magnets were increased in parallel and perpendicular directions to the c-axis by hot-deforming Nd-Fe-B melt-spun flakes coated with DyF3 through electrophoretic deposition. As a result, the operating temperature under high-frequency AC magnetic field decreased by 20°C due to the reduction of eddy current loss. The formation of a resistive layer composed of NdF3 at the interface of original ribbons in the hot-deformed magnet was observed. The excess Dy diffused into the original ribbon flakes and formed a Dy-rich shell in Nd2Fe14B grains, resulting in a high coercivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Microscopy
Jun Uzuhashi, Tadakatsu Ohkubo, Kazuhiro Hono
Summary: Atom probe tomography (APT) is a widely used technique for analyzing the microstructure of alloys and devices. In this study, a method for automatically fabricating the desired tip shape using a script-controlled FIB-SEM system was developed. The effect of intentionally changing the tip shape on APT data was also discussed.
Article
Engineering, Electrical & Electronic
Ruma Mandal, Yuta Sasaki, Ivan Kurniawan, Jiwon Jung, Yoshio Miura, Yuya Sakuraba, Kazuhiro Hono, Yukiko K. Takahashi
Summary: In this work, a high-temperature time-resolved magneto-optical Kerr effect microscopy is developed to measure the magnetization dynamics at elevated temperatures, providing a crucial understanding of the damping mechanism for highly anisotropic ferromagnetic materials and its dependence on temperature.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
T. T. Sasaki, H. Sepehri-Amin, J. Uzuhashi, T. Ohkubo, K. Hono
Summary: This article highlights the importance of atom probe tomography (APT) in material analysis. Complementary or correlative (S)TEM/APT analysis provides detailed information on the structure and element distribution of materials, helping to understand the underlying mechanisms contributing to the development of excellent properties.
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)