Article
Chemistry, Physical
Guantong Wei, Min Zhao, Xianshuang Xia, Jinyun Ju, Yeyuan Du, Yiping Huang, Xu Tang, Wenzong Yin, Renjie Chen, Aru Yan
Summary: The effects of adding (Pr0.25Nd0.75)10Dy80Cu5Al5 alloy powders on the magnetic properties and microstructure of hot-deformed Nd-Fe-B magnets were investigated. The addition of (Pr0.25Nd0.75)10Dy80Cu5Al5 resulted in an ultrahigh coercivity of 3.14 T in a 6-mm-thick hot-deformed magnet, and improved the temperature coefficient of coercivity and remanence at 20-180℃, indicating excellent thermal stability. Microstructure observations showed that the addition of (Pr0.25Nd0.75)10Dy80Cu5Al5 led to the formation of thick nonferromagnetic intergranular phase, reduced grain size and aspect ratio, and the formation of the (Nd,Pr,Dy)2Fe14B main phase, which were the main reasons for the enhancement of coercivity and thermal stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
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.
Review
Materials Science, Multidisciplinary
Keiko Hioki
Summary: This study focused on the magnetic properties of hot-deformed anisotropic Nd-Fe-B magnets, improving the hot-deformation technique and optimizing microstructure to fabricate high-performance magnets.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Xin Tang, J. Li, H. Sepehri-Amin, T. Ohkubo, K. Hioki, A. Hattori, K. Hono
Summary: A novel method was introduced to improve the squareness and coercivity of bulk hot-deformed Nd-Fe-B magnets through two step diffusion, resulting in a more uniform HRE shell. Magneto-optical Kerr effect microscopy showed strong pinning of magnetic domain wall motion at side grain boundaries in the two-step diffusion processed magnet.
Article
Materials Science, Multidisciplinary
Xin Tang, H. Sepehri-Amin, A. Bolyachkin, T. Ohkubo, K. Hono
Summary: This study explores the potential of low-cost (Nd,La,Ce)-Fe-B hot deformed magnets for the application in variable-magnetic-force (VMF) motors. The results show that the hot-deformed magnets have the ability to adjust the coercivity and exhibit flat reversal curves. The microstructure observation and magneto-optical Kerr effect microscopy reveal the origin of the flat reversal curves. Additionally, the hot-deformed magnets have a relatively high remanent magnetization compared to sintered magnets, making them excellent candidates for VMF motor applications.
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
Nanoscience & Nanotechnology
M. Korent, Xin Tang, H. Sepehri-Amin, K. Hiokid, K. Z. Soderznik, S. Kobe, T. Ohkubo, K. Hono
Summary: This study achieved a high coercivity of 2.5 T in a Dy-free Nd-Fe-B magnet with a low Dy concentration through a two-step diffusion process. The sample also retained relatively high remanence and showed an excellent temperature coefficient of coercivity.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Jun-Ming Wang, Zhao-Hui Guo, Zheng Jing, Xiao Du, Neng-Jun Yu, Meng-Yu Li, Ming-Gang Zhu, Wei Li
Summary: The effects of low-melting Pr-Cu alloy addition on the microstructure and magnetic properties of hot-deformation Nd-Fe-B magnets were investigated. A small amount of Pr-Cu addition significantly enhances the coercivity of the magnets. The presence of a uniform RE-rich phase wrapping the Nd2Fe14B main phase promotes the coercivity. The remanence, intrinsic coercivity, and maximum magnetic energy product of the magnets increase with Pr-Cu addition.
Article
Materials Science, Multidisciplinary
Tingting Song, Xin Li, Xu Tang, Wenzong Yin, Yang Luo, Dunbo Yu, Wenlong Yan, Jinyun Ju, Renjie Chen, Aru Yan
Summary: Nb element was introduced to regulate the microstructure of melt-spun powder and die-upset magnets, effectively restricting grain growth in coarse grain regions. The addition of Nb significantly improved the magnetic properties and thermal stability of the magnets, forming an anisotropic magnet.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Renquan Wang, Qiaosen Yang, Ying Liu, Jun Li, Tingchuan Zhou, Xiaojiao Yang
Summary: The addition of SLG as an additive in hot-deformed Nd-Fe-B magnets forms a new bi-morphologically anisotropic microstructure, enhancing the magnetic properties of the magnet, particularly the coercivity. SLG acts on interfaces by inhibiting grain growth and eliminating the width of coarse grain regions, leading to improved magnetic properties of the magnet.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Tieqiao Zhang, Shengsheng Liu, Zhongwei Wu, Lanting Zhang, Rong Yu
Summary: In this study, a high-temperature short-term annealing process was used to simultaneously improve the coercivity, remanence, and squareness factor of hot-deformed Nd-Fe-B magnets. The increase in coercivity was attributed to the melting and infiltration of the Nd-6(Fe,Co)(13)Ga phase. The slightly anisotropic growth of Nd2Fe14B grains resulted in improved grain alignment and enhanced remanence. The addition of a small amount of Co element significantly reduced the melting point of the Nd6Fe13Ga phase. A balance between infiltration within the powder flakes and grain growth was achieved, leading to the simultaneous improvement of coercivity, remanence, and squareness factor in hot-deformed Nd-Fe-B samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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
Chemistry, Applied
Longquan Hou, Jinyun Ju, Xu Tang, Renjie Chen, Wenzong Yin, Aru Yan, Bin Chen, Yeyuan Du
Summary: The coercivity of hot-deformed Nd-Fe-B magnets can be effectively increased by adjusting the sandwiched structure and adding Nd-Cu eutectic alloys, while reducing remanence loss. In addition, the infiltrated Nd-Cu eutectic plays a critical role in inhibiting grain growth and intergranular magnetic interaction in the optimized microstructure, contributing positively to coercivity.
JOURNAL OF RARE EARTHS
(2021)
Article
Chemistry, Physical
Hongxing Chen, Renquan Wang, Jun Li, Chang Liu, Xiaojiao Yang, Ying Liu
Summary: By introducing 0.1 wt% of insulating nano-diamonds (NDs) into hot-deformed Nd-Fe-B magnets, this study successfully improves the magnetic properties and resistivity of the magnets, enhancing both coercivity and resistivity to resist thermal demagnetization under complex operating conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Ke Xu, Xuefeng Liao, Hongya Yu, Xichun Zhong, Zhongwu Liu, Guoqing Zhang
Summary: In this study, amorphous melt-spun ribbons were used directly as precursors for Nd-Fe-B magnets, and their influences on microstructure and magnetic properties were investigated. The hot-pressed magnets exhibited improved grain pre-orientation and magnetic properties with increasing temperature, pressure, and holding time. The magnetic properties of hot-deformed magnets were mainly influenced by the deformation temperature.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Ruma Mandal, Ivan Kurniawan, Ippei Suzuki, Zhenchao Wen, Yoshio Miura, Takahide Kubota, Koki Takanashi, Tadakatsu Ohkubo, Kazuhiro Hono, Yukiko K. Takahashi
Summary: In this study, a high-quality half-metallic epitaxial nano-scale thick NiMnSb alloy film grown on a Cr/Ag-buffered MgO (001) single crystalline substrate was reported. The highly ordered C1(b) structured nano-scale thick NiMnSb film deposited at 573 K exhibited ultralow Gilbert damping, high anisotropic field, and saturation magnetization. The analysis of theoretical and experimental data revealed a strong correlation between crystal ordering and magnetic parameters, as well as sample quality. The negative anisotropic magnetoresistance ratio demonstrated the robust bulk half-metallicity. This unique combination of highly ordered nano-scale half-metallic NiMnSb alloy with ultralow damping can be advantageous for spintronic device applications.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Xin Tang, H. Sepehri-Amin, A. Bolyachkin, T. Ohkubo, K. Hono
Summary: This study explores the potential of low-cost (Nd,La,Ce)-Fe-B hot deformed magnets for the application in variable-magnetic-force (VMF) motors. The results show that the hot-deformed magnets have the ability to adjust the coercivity and exhibit flat reversal curves. The microstructure observation and magneto-optical Kerr effect microscopy reveal the origin of the flat reversal curves. Additionally, the hot-deformed magnets have a relatively high remanent magnetization compared to sintered magnets, making them excellent candidates for VMF motor applications.
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
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
Physics, Applied
Tomohiro Ichinose, Tatsuya Yamamoto, Jun Uzuhashi, Takayuki Nozaki, Tadakatsu Ohkubo, Kay Yakushiji, Shingo Tamaru, Kazuhiro Hono, Shinji Yuasa
Summary: Thermally robust perpendicular magnetic anisotropy and voltage-controlled magnetic anisotropy effects were achieved in magnetic tunnel junctions with ultrathin CoFeB films by utilizing Ta/Mo layered adhesion structures.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Condensed Matter
Akira Uedono, Hideki Sakurai, Jun Uzuhashi, Tetsuo Narita, Kacper Sierakowski, Shoji Ishibashi, Shigefusa F. Chichibu, Michal Bockowski, Jun Suda, Tadakatsu Ohkubo, Nobuyuki Ikarashi, Kazuhiro Hono, Tetsu Kachi
Summary: In this study, the annealing behaviors of defects and the diffusion characteristics of Mg in ion-implanted GaN were investigated. It was found that high concentration of Mg doping caused Mg diffusion into the bulk and reaction with vacancies, while nitrogen implantation suppressed the Mg diffusion and enhanced the donor-acceptor pair emission, which is of great significance for improving the performance of GaN materials.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
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
Nanoscience & Nanotechnology
G. Lambard, T. T. Sasaki, K. Sodeyama, T. Ohkubo, K. Hono
Summary: The paper presents an active learning pipeline assisted by machine learning and Bayesian optimization for optimizing the process of permanent magnet to achieve high coercivity and remanence.
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
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
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)
