Article
Nanoscience & Nanotechnology
L. Fu, C. Yang, R. Wei, X. Pei, J. Teng, D. Kong, Y. Lu, Y. Guo, T. Liu, Y. Hu, B. Yin, Z. Zhang, A. Li, L. Wang, X. Han
Summary: This study investigated the atomic-scale deformation process of AuCu nanowires with a size of 16 nm for the first time, revealing superplasticity and high strength at room temperature. The observed superplasticity was found to originate from continuous full dislocation activities and other factors, differing from previous studies on pure metals.
MATERIALS TODAY NANO
(2021)
Article
Materials Science, Multidisciplinary
Yizhong Guo, Jiao Teng, Guo Yang, Ang Li, Yao Deng, Chengpeng Yang, Lihua Wang, Xin Yan, Ze Zhang, Xiaoyan Li, En Ma, Xiaodong Han
Summary: Detailed monitoring of atomic-scale processes is crucial for understanding grain rotation in nanocrystalline metals. In this study, in situ atomic-resolution evidence reveals that the type of grain boundary plays a role in the atomic processes involved in grain rotation in nanocrystalline Pt. General GBs exhibit a combination of dislocation activities and atomic rearrangements, while tilt GBs mostly rely on dislocation activities. GB dislocation climb, glide, and reaction are often associated with Lomer-like dislocation formation and destruction.
Article
Biochemical Research Methods
Tiqing Zhao, Youhong Jiang, Shiwen Luo, Yifan Ying, Qian Zhang, Shi Tang, Linzhi Chen, Jing Xia, Peng Xue, Jia-Jun Zhang, Shi-Gang Sun, Hong-Gang Liao
Summary: The study focuses on the catalysis reaction mechanism at the nano/atomic scale and the limitations of current in situ characterization technologies. By combining in situ transmission electron microscopy (TEM) holder system with MEMS chips, an ultra-stable heating chip is developed to achieve atomic resolution imaging during the heating process at high temperature. The developed gas reaction cells with ultra-low drift enable the identification of nanoparticle's structure evolution at the atomic scale.
Review
Physics, Applied
Yuchen Zhu, Haofei Zhao, Yang He, Rongming Wang
Summary: In-situ TEM technology allows researchers to directly conduct experiments in the TEM by introducing various stimuli into the sample chamber, profoundly impacting materials science and engineering.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Penghui Li, Yeqiang Bu, Linyan Wang, Chong Wang, Junquan Huang, Ke Tong, Yujun Chen, Julong He, Zhisheng Zhao, Bo Xu, Zhongyuan Liu, Guoying Gao, Anmin Nie, Hongtao Wang, Yongjun Tian
Summary: Fracture behaviors in perfect and twinned B4C crystals were studied via in situ TEM mechanical testing. It was found that cracks preferentially initiated at the twin boundaries (TBs) and propagated along them, resulting in the fracture of B4C. The theoretical calculations also showed a softening effect of TBs on B4C, with amorphous bands preferentially nucleated at the TBs. These findings clarify the atomic arrangement and the role of planar defects in the failure of B4C.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hui Zhang, Tao Xu, Yatong Zhu, Wen Wang, Hao Zhang, Dundong Yuan, Litao Sun
Summary: The study revealed oscillatory growth during the oxidation process of silver, influenced by both thermodynamic and kinetic factors. These findings enhance the fundamental understanding of oxidation processes and offer a promising method for the fabrication of desired nanostructures.
Article
Materials Science, Multidisciplinary
Christoph Gammer, Christian Rentenberger, Denise Beitelschmidt, Andrew M. Minor, Juergen Eckert
Summary: In this study, a tailored BMG nanocomposite containing a high density of monodisperse nanocrystals with a size of around 20 nm was fabricated using a combination of mechanical and thermal treatment of Cu36Zr48Al8Ag8 well below the crystallization temperature. Direct observations showed that the achieved nanocomposite has the potential to inhibit catastrophic fracture in tension, indicating that a sufficient number of nanoscale structural heterogeneities can lead to BMG composites with superior mechanical properties.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Multidisciplinary
Fang Liu, Jiashen Meng, Hong Wang, Shulin Chen, Ruohan Yu, Peng Gao, Jinsong Wu
Summary: This study reveals the phase transformations and electrochemical mechanism of tellurium (Te) in potassium-ion batteries (PIBs) using in situ high-resolution transmission electron microscopy and electron diffraction. The results show that the potassium storage in Te is highly reversible, providing implications for the future design of high-performance nanostructured cathodes for PIBs.
Review
Chemistry, Multidisciplinary
Zelin Wang, Xiaoxing Ke, Manling Sui
Summary: This mini-review summarizes recent progress on revealing 3D structures of electrocatalysts using 3D electron tomography. It discusses the information that can be revealed at nanoscale and atomic scale, and explores the application of this technique in durability investigation and post-treatment of electrocatalysts.
FRONTIERS IN CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Frank Niessen, Azdiar A. Gazder, David R. G. Mitchell, Elena V. Pereloma
Summary: Microstructure evolution during the 3-point bending of a metastable beta Ti-10V-2Fe-3Al alloy containing 5% alpha was dominated by the formation of deformation-induced alpha '' martensite. The nucleation of alpha '' plates from {580}(alpha '') habit planes at alpha-beta interfaces, impingement with high-angle boundaries, and subsequent thickening led to a build-up of strain energy inducing {130} < 310 >(alpha '') twinning. The study also revealed the activation of {130}< 310 >(alpha '') twinning by alpha '' impingement in a metastable beta matrix.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Ceramics
Binzhi Liu, Ling Li, Shan-Tao Zhang, Lin Zhou, Xiaoli Tan
Summary: A comparative study was conducted on PNZST/ZnO ceramic composites with different ratios, revealing that the lower ratio (x=0.1) composite exhibited a stable ferroelectric phase at room temperature, transitioning to an antiferroelectric phase upon heating, contributing to the pyroelectric effect. In contrast, the higher ratio (x=0.4) composite showed the presence of Zn2SnO4, leading to the decomposition of the ferroelectric matrix phase and consequently lower pyroelectric coefficient.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Mengyu Gao, Yoonjae Park, Jianbo Jin, Peng-Cheng Chen, Hannah Devyldere, Yao Yang, Chengyu Song, Zhenni Lin, Qiuchen Zhao, Martin Siron, Mary C. Scott, David T. Limmer, Peidong Yang
Summary: Halide perovskite is a unique dynamical system with complex structural and chemical processes, but its intrinsic instability makes real-time investigation challenging. However, our research reveals that atomically thin carbon materials can stabilize ultrathin halide perovskite nanostructures and enable atomic-level visualization of their movement. Protected by carbon shells, these structures maintain their integrity under high electron dose rate and exhibit unusual dynamical behaviors. Our work provides a new method to protect beam-sensitive materials and study structure dynamics of nanomaterials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Huaping Sheng, Long Zhang, Haifeng Zhang, Jianbo Wang, Juergen Eckert, Christoph Gammer
Summary: The transformation-induced plasticity is a fundamental solution for improving the ductility of bulk metallic glass composites (BMGCs). The transformation redistributes the stress in the adjacent matrix, making interfacial regions potential preferential sites for shear band nucleation, which then enhance the ductility of BMGCs.
MATERIALS RESEARCH LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Xian-Kui Wei, Chun-Lin Jia, Krystian Roleder, Rafal E. Dunin-Borkowski, Joachim Mayer
Summary: By slowing down the phase-transition speed, researchers have successfully captured the dynamic energy-storage process in antiferroelectric dielectric capacitors and revealed part of the energy storage pathway.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Pratibha L. Gai, Edward D. Boyes
Summary: Real-time in situ visualization and analysis of gas-solid catalyst reactions are crucial for understanding the relationship between dynamic catalyst atomic structure and function. Single atom processes and reaction mechanisms are believed to be important in catalytic reactions, but are not well understood under extreme reaction conditions like gas and temperature.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Ceramics
Sengo Kobayashi, James M. Howe, Mitsuhiro Murayama
Summary: The study revealed the phenomena of chemical reordering and solute cluster formation in glasses during heating. The interaction between the formation of ribbon and bulk metallic glasses and solute clusters resulted in different effects during temperature increase.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Physics, Applied
Masaki Mito, Narimichi Mokutani, Hiroki Tsuji, Yongpeng Tang, Kaname Matsumoto, Mitsuhiro Murayama, Zenji Horita
Summary: In this study, the researchers explored new superconductors with higher transition temperatures (Tc) in the Al-Mg-Ti ternary system. They utilized high-pressure torsion (HPT) to produce superconducting states and discovered superconductivity with Tc of 4.0 and 7.3 K. Machine learning predictions supported the appearance of magnetic anomalies at around 55 K and 93 K, indicating the importance of Al-Ti oxides in the manifestation of these anomalies, with the addition of Mg being less effective.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
J. V. Haag, J. Wang, D. J. Edwards, W. Setyawan, M. Murayama
Summary: A combination of electron backscattered diffraction and transmission electron microscopy was used to study the effects of purposefully introduced anisotropy in a tungsten heavy alloy through hot-rolling. The study focused on changes in number and proportion of various boundary types, and found that increased temperatures and longer annealing time can improve the mechanical properties of the alloy.
SCRIPTA MATERIALIA
(2022)
Article
Multidisciplinary Sciences
K. Sasaki, M. Muramatsu, K. Hirayama, K. Endo, M. Murayama
Summary: Observation of dynamic processes using transmission electron microscopy (TEM) is important for understanding nanoscale phenomena and microstructure-properties relationships. However, quantitatively evaluating the dynamic behavior of defects has been challenging due to the limitations of image interpretation and analysis. To overcome these challenges, we developed a quantitative image analysis framework that combines machine learning and particle filter estimation, enabling successful tracking and analysis of nanoscale objects.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Shiro Ihara, Hikaru Saito, Mizumo Yoshinaga, Lavakumar Avala, Mitsuhiro Murayama
Summary: This study presents an image correction framework based on deep learning for addressing distortion and noise issues in STEM image acquisition. Experimental results demonstrate that DL enables rapid and high-quality STEM image acquisition with high spatio-temporal resolution.
SCIENTIFIC REPORTS
(2022)
Article
Nanoscience & Nanotechnology
Jesada Punyafu, Sukyoung Hwang, Shiro Ihara, Hikaru Saito, Nobuhiro Tsuji, Mitsuhiro Murayama
Summary: Carbon-containing TWIP steels, which have a great strain hardening capability, suffer from serrations on the stress-strain curves, hindering their commercial development. The impact of grain size, especially in the ultrafine-grained range, and its orientation on the serrations and plastic deformation mechanism has been overlooked. This study compared the plastic deformation behavior in fine-grained and ultrafine-grained specimens and found a change in the dominant deformation mode when the grain size was equal to or smaller than 1 μm. The alteration was strongly influenced by the grain orientation and resulted in the enhancement of strain localization and the inhibition of serrations in the ultrafine-grained specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Kazuhisa Sato, Shunya Takagi, Satoshi Ichikawa, Takuya Ishimoto, Takayoshi Nakano
Summary: Using transmission electron microscopy and energy-dispersive x-ray spectroscopy, we investigated the microstructure and solute segregation in the melt pool boundary of orientation-controlled 316L austenitic stainless steel produced by laser powder bed fusion. The solidification cellular microstructures were visualized by solute segregation, and Mn-Si-O inclusions were observed along the lamellar boundaries and dislocation cell walls. The widening of cellular spacing at the bottom of the melt pool boundary was attributed to the decrease in cooling rate.
Article
Multidisciplinary Sciences
J. V. Haag, J. Wang, K. Kruska, M. J. Olszta, C. H. Henager, D. J. Edwards, W. Setyawan, M. Murayama
Summary: Tungsten heavy alloys are being studied as plasma facing material components in nuclear fusion reactors. In this study, a 90W-7Ni-3Fe alloy was used to create a multiphase brick-and-mortar structure, inspired by the strength and stiffness of mollusks. The high-resolution structural and chemical characterization techniques revealed chemically diffuse phase boundaries with unexpected lattice coherency, contributing to the high strength and toughness of tungsten heavy alloys.
SCIENTIFIC REPORTS
(2023)
Article
Microscopy
Norio Baba, Satoshi Hata, Hikaru Saito, Kenji Kaneko
Summary: Electron tomography (ET) is a powerful tool for studying the properties and functionalities of materials. Recent advancements in hardware and reconstruction algorithms have led to significant improvements in resolution. This review paper aims to provide an overview of the basic theories, measurement methods, and recent progress in ET applications in materials science.
Article
Materials Science, Ceramics
Takato Kajihara, Kosho Akatsuka, Hiroyuki Hijiya, Satoshi Yoshida, Aran Mitsuta, Hongye Gao, Shigeru Fujino, Satoshi Hata
Summary: The addition of Li2O promotes the crystallization of BaSi2O5 in glass, even in small amounts such as 0.2% and 0.5%. The introduction of Li2O also enhances phase separation in the early stage of heat treatment, resulting in the formation of Si-rich droplet phases and Ba-rich phases.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Avala Lavakumar, Shuhei Yoshida, Jesada Punyafu, Shiro Ihara, Yan Chong, Hikaru Saito, Nobuhiro Tsuji, Mitsuhiro Murayama
Summary: The study focuses on the influence of grain size and temperature on the mechanical properties of equiatomic FeCoNi alloy. Different grain sizes ranging from ultra-fine to coarse were achieved by high-pressure torsion and annealing. The results show that the tensile yield strength is affected by temperature and grain size, and the grain boundary strength remains constant while the friction stress increases at lower temperature. At cryogenic temperature, the presence of nano twinning contributes to the enhancement of strength and ductility in addition to dislocation slip.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Electrical & Electronic
Satoshi Hata, Daiki Fukuda, Hikaru Saito, Yusuke Shimada, Zimeng Guo, Akiyoshi Matsumoto, Hideharu Nakashima, Hitoshi Kitaguchi
Summary: The impurity phases play a crucial role in the formation and microstructure of the multilayer films, promoting the phase transition to Bi,Pb-2223. After heat treatment, the fraction of the Bi,Pb-2223 phase was approximately 50%, suggesting that controlling the formation and microstructure of the impurity phases is essential for further increasing the fraction of the Bi,Pb-2223 phase.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Chemistry, Multidisciplinary
Shiro Ihara, Mizumo Yoshinaga, Hiroya Miyazaki, Kota Wada, Satoshi Hata, Hikaru Saito, Mitsuhiro Murayama
Summary: The in situ observation of thermally activated solid reactions in nanoparticles has been achieved using electron microscopy combined with electron tomography. The study revealed a negative correlation between neck growth and particle distance, and succeeded in reducing the electron dose and preventing interference from oxidation and other artifacts.
Article
Materials Science, Multidisciplinary
Kazuhisa Sato, Hirotaro Mori
Summary: We propose a new mechanism of crystallization in amorphous alloys mediated by additional solute atoms produced by electronic excitation. Extensive crystallization of a-SiOx/a-Pd-Si/a-SiOx sandwiched Pd-19at%Si amorphous alloy occurred by electron irradiation. This crystallization can be achieved not only at room temperature but also at 90 K.
