Article
Chemistry, Physical
Erhao Wang, Caihai Xiao, Jiayi He, Cifu Lu, Mozaffar Hussain, Renheng Tang, Qing Zhou, Zhongwu Liu
Summary: The use of a grain boundary diffusion process with ZnO as the diffusion source has significantly enhanced the coercivity and corrosion resistance of sintered Nd-Fe-B magnets. The coercivity of the magnets increased significantly while the formation of oxides at triple junctions improved the corrosion resistance of the diffused magnets.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Ceramics
Navya Yadav, Stephen C. Parker, Abhishek Tewari
Summary: This study investigated the segregation of Al in ZnO grain boundaries (GBs) and established the correlation between GB concentration and nominal dopant concentration using a genetic algorithm assisted multiscale modelling framework. The nominal solubility of Al in ZnO was also calculated as a function of grain size. These findings provide a pathway for predictive dopant engineering and understanding the relationship between GB structure and properties in ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Wiem Bouslama, Monaam Ben Ali, Nasr Sdiri, Habib Elhouichet
Summary: Fe doped ZnO nanocrystals synthesized from sol-gel method exhibit good crystalline quality and electrical properties, showing potential for energy storage applications.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Shuo Wang, Xiang Cai, Zan Wang, Jia Ju, Jian Zhou, Feng Xue
Summary: This study investigates the impact of solute Al on the penetration of Cu atoms into the Fe grain boundary in the Fe-Cu embrittlement system through molecular dynamics simulations. Additionally, first principle density functional theory calculations are performed to determine the binding properties and electronic structure of GBs doped with solute atoms. The mechanisms of inhibiting liquid metal embrittlement cracks in the Fe-Cu system by Al are analyzed at the atomic scale. The results demonstrate that Al diffusion along the GB direction is much higher than that of Cu, and the preferential penetration and segregation of Al atoms act as a barrier layer.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Qi Chen, Rong Hu, Shenbao Jin, Fei Xue, Gang Sha
Summary: This study investigated the irradiation-induced segregation of solutes at typical grain boundaries in Fe-Mn-Si steel, revealing that Mn and C segregate at grain boundaries and the extent of segregation depends on the characteristics of the boundaries, with the strongest segregation observed at random high-angle boundaries.
Article
Materials Science, Multidisciplinary
Qizhang Yan, Jian Luo
Summary: A series of electric field-induced microstructural evolution phenomena are observed in polycrystalline Bi2O3-doped ZnO, and the underlying mechanisms are revealed. The migration of bismuth (Bi) towards the negative electrode is driven by an applied electric field, which creates a Bi-free zone near the anode and forms a junction between ZnO and Bi2O3-doped ZnO, resulting in the generation of porosity and abnormal grain growth. The formation of three distinct types of grain boundaries (GBs) and the complex transitions between disordered and ordered GBs are observed using aberration-corrected electron microscopy.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kai Hu, Jun Yi, Bo Huang, Xilei Bian, Gang Wang
Summary: This study overcomes the trade-off between strength and ductility in pure nickel materials by using grain boundary relaxation and optimizing grain size. The results show that grain boundary relaxation can improve both tensile strength and uniform elongation of nickel, and enhance the plastic deformation through controlling dislocation activities.
APPLIED MATERIALS TODAY
(2022)
Article
Multidisciplinary Sciences
Toshihiro Futazuka, Ryo Ishikawa, Naoya Shibata, Yuichi Ikuhara
Summary: Impurity doping is an effective method to control the functional properties of materials, but it can significantly alter material properties when the dopants segregate to grain boundaries. In this study, the researchers investigated the structural transformation of alpha-Al2O3 grain boundaries induced by co-segregation of calcium (Ca) and silicon (Si) dopants. They found that the introduction of Ca ions led to a new grain boundary structure with larger free volumes and a chemically ordered structure formed by Si and Ca dopants. This research provides insights into grain boundary engineering using aliovalent co-segregation.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Hanna Bishara, Lena Langenohl, Xuyang Zhou, Baptiste Gault, James P. Best, Gerhard Dehm
Summary: The study focuses on the effect of Fe-alloying on the resistivities of grains and grain boundaries in Cu thin films. Cu films with varying grain sizes and Fe compositions were prepared. The properties, morphology, and compositions of bulk and grain boundaries were analyzed using different methods. Both local electrical measurements and global resistivity characterization were performed to obtain specific resistivities and calculate the grain boundary reflection coefficient. It was found that alloying significantly increased the resistivity of grain boundaries while causing only minor influence on the grain interior.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Sheng Li, Xiangding Wang, Jianzeng Ren, Chunyang Liu, Yifan Hu, Youwen Yang
Summary: Fe was successfully alloyed with Zn to improve the mechanical properties of orthopedic implants. The alloying process activated grain boundary pinning effect, resulting in refined grains and reduced stress concentration. The formation of intermetallic FeZn13 phases contributed to precipitation strengthening. The Zn-Fe alloys exhibited increased compression yield strength, hardness, and good biocompatibility, making them a promising candidate for orthopedic implants.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Wenjin Liu, Jianping Ai, Wenkui Li, Lihong Cheng
Summary: This study utilized a two-step sintering method to prepare ZnO-Bi2O3 varistor ceramics and improve the microstructure uniformity of the samples. The results showed that the two-step sintered samples exhibited higher breakdown voltage, relative density, and uniform microstructure.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Hye-In Lee, Ri-Ye Kwon, Soo-Jin Choi
Summary: The interaction between additive solvents and zinc oxide nanoparticles affects the dispersion and solubility of the nanoparticles, leading to different biological responses.
Article
Materials Science, Multidisciplinary
X. F. Xu, X. Y. Li, B. Zhang
Summary: This study reveals that intentional segregation of Cr can be enhanced in a nanostructured alloy with insufficient grain boundary segregation tendency through the interaction with another solute, Si. The enhanced Cr segregation improves the thermal stability of the nanograined alloy. With further grain refinement, the thermal stability is increased due to the increased Cr content at grain boundaries and the formation of precipitates at appropriate high temperatures.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Rusiri Rathnasekara, Parameswar Hari
Summary: The study synthesized four nanostructured ZnO morphologies at different annealing temperatures and analyzed their structural, optical, and electrical properties using various techniques. The results showed a decrease in resistance with increasing temperature and distinct semicircle profiles in nanorods, nanoshuttles, and nanoribbons at higher temperatures due to grain and grain boundaries. The study suggested that the optimal ZnO nanomorphology based on impedance studies could be utilized for developing electrodes for dye-sensitized solar cells.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Fusheng Tan, Jia Li, Hui Feng, Qihong Fang, Chao Jiang, Yong Liu, Peter K. Liaw
Summary: This study investigates the nanoscale grain boundary structure and migration mechanism in multi-principal element alloys, revealing the roughening transformation of grain boundaries as mixing entropy increases. It confirms the effect of entropy on grain boundary migration, showcasing different migration mechanisms for ordered and disordered grain boundaries under different entropy conditions.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Yuanshen Qi, Anna Kosinova, Askar R. Kilmametov, Boris B. Straumal, Eugen Rabkin
SCRIPTA MATERIALIA
(2020)
Article
Physics, Multidisciplinary
B. B. Straumal, A. R. Kilmametov, A. A. Mazilkin, A. S. Gornakova, O. B. Fabrichnaya, M. J. Kriegel, D. Rafaja, M. F. Bulatov, A. N. Nekrasov, B. Baretzky
Article
Materials Science, Multidisciplinary
Mario J. Kriegel, Martin Rudolph, Askar Kilmametov, Boris B. Straumal, Julia Ivanisenko, Olga Fabrichnaya, Horst Hahn, David Rafaja
Article
Physics, Multidisciplinary
B. B. Straumal, A. A. Mazilkin, S. G. Protasova, A. R. Kilmametov, A. Druzhinin, B. Baretzky
Article
Physics, Multidisciplinary
A. B. Straumal, I. A. Mazilkin, K. Tsoi, B. Baretzky, B. B. Straumal
Article
Chemistry, Physical
Anna Korneva, Boris Straumal, Askar Kilmametov, Lukasz Gondek, Anna Wierzbicka-Miernik, Lidia Litynska-Dobrzynska, Grzegosz Cios, Robert Chulist, Pawei Zieba
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Materials Science, Multidisciplinary
Alexander Straumal, Ivan Mazilkin, Kristina Tzoy, Boris Straumal, Krzysztof Bryla, Alexander Baranchikov, Gunther Eggeler
Article
Materials Science, Multidisciplinary
Yuanshen Qi, Yaron Kauffmann, Anna Kosinova, Askar R. Kilmametov, Boris B. Straumal, Eugen Rabkin
Summary: This study reveals a gradient of oxygen vacancy concentration and concomitant bandgap narrowing in metal oxide nanoparticles processed by severe mechanical deformation, paving the way for strain engineering of gradient-structured metal oxide semiconductors with unique functional properties.
MATERIALS RESEARCH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Boris Straumal, Olga Kogtenkova, Marat Bulatov, Alexei Nekrasov, Alexandr Baranchikov, Brigitte Baretzky, Alexandr Straumal
Summary: This paper investigates the wetting behavior of grain boundary triple junctions by the second solid phase delta in Cu-In alloys, revealing a non-monotonic trend with increasing temperature. The study found that the wetting of grain boundary triple junctions also behaves non-monotonously, with the percentage of wetted triple junctions initially increasing to 100% and then decreasing with temperature rise.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Physics, Condensed Matter
Olga Kogtenkova, Boris Borisovich Straumal, Andrey Mazilkin, Tomasz Czeppe, Pawel Zieba
Summary: High-pressure torsion processing on as-cast aluminum-magnesium alloys leads to significant grain refinement and phase transitions. Heating of the alloys shows the appearance of Mg-rich intermetallic phases in a specific sequence. The fine-grained Al-Mg alloy after HPT treatment and annealing contains Mg-rich areas near grain boundaries, indicating possible grain boundary phase transitions.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2021)
Article
Biochemistry & Molecular Biology
Ilya Lyagin, Nikolay Stepanov, George Frolov, Elena Efremenko
Summary: Fiber materials with pronounced chemical-biological protection can be obtained by combining metal nanoparticles and enzymes. The combination of metal nanoparticles and enzymes is more effective than the combination of enzymes and antibiotics, allowing for reduced application quantities. The modified fiber materials show increased elimination of bacterial cells and the enzymes retain their activity in reaction with organic phosphorus compounds. Different metal nanoparticles exhibit selectivity against different types of bacteria.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Review
Chemistry, Physical
Boris B. Straumal, Roman Kulagin, Leonid Klinger, Eugen Rabkin, Petr B. Straumal, Olga A. Kogtenkova, Brigitte Baretzky
Summary: During severe plastic deformation, lattice defect formation and their relaxation compete with each other, establishing a dynamic equilibrium. Other kinetic processes like grain refinement/growth and mechanical strengthening/softening also compete and result in steady states. However, particle fragmentation during the second phase of SPD has received little attention.
Article
Crystallography
Boris B. Straumal, Roman Kulagin, Brigitte Baretzky, Natalia Yu. Anisimova, Mikhail V. Kiselevskiy, Leonid Klinger, Petr B. Straumal, Olga A. Kogtenkova, Ruslan Z. Valiev
Summary: This review discusses the intersection of phase transformations, severe plastic deformation (SPD), and high-entropy alloys (HEA) in materials science. The use of SPD techniques enables the determination of single-phase regions and the formation of nanoparticles in HEAs, influencing their composition, structure, and properties.
Article
Chemistry, Physical
Petr Straumal, Yuri Zavorotnev, Leonid Metlov, Olga Popova
Summary: High-pressure torsion is an important method of severe plastic deformation. During deformation, a dynamic equilibrium is reached between defect production and annihilation. However, the establishment of equilibrium at the initial stage with angular acceleration is still unexplored.
Article
Metallurgy & Metallurgical Engineering
N. S. Martynenko, N. R. Bochvar, P. B. Straumal, D. A. Aksenov, G. Raab, S. Dobatkin
Summary: The study shows that equal-channel angular pressing (ECAP) significantly refines the structure of Cu-7% Cr and Cu-10% Fe alloys, increasing their strength but reducing their plasticity. Additional aging treatment can further enhance the hardness, electrical conductivity, and strength of the alloys while decreasing their plasticity.
RUSSIAN METALLURGY
(2021)
