Article
Materials Science, Multidisciplinary
J. H. Huang, S. G. Huang, P. Zhou, B. Lauwers, J. Qian, J. Vleugels
Summary: The influence of up to 15 vol% WC or Mo2C addition on Ni bonded NbC matrix cermets was assessed in this study. Thermodynamic modelling, microstructure and phase analysis were used to study the constituent phases and dissolution of W/Mo in the binder and NbC phases. The study discussed the phase evolution, solid solution formation, and evaluated fracture toughness, Vickers hardness, and transverse rupture strength.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Qingxiao Zhang, Wei Wang, Qing Yuan, Zhoutou Wang, Zhicheng Zhang, Guang Xu
Summary: The effects of niobium (Nb) on the thermal stability and mechanical properties of a low-carbon ultrafine grain steel (UFG) were studied. It was found that the dissolved Nb in the Nb-UFG steel improved the thermal stability and strength, but reduced the plasticity. The inhibitory effect of numerous Nb(C, N) particles re-precipitated during annealing led to finer ferrite grains and higher thermal stability and strength. However, the decreased elongation was attributed to the finer ferrite grains and coarse Fe3C particles.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Feng Cai, Mingxing Zhou, Junyu Tian, Guang Xu
Summary: This investigation examines the role of niobium (Nb) in ferritic and bainitic steels, and explores its influence on the transformation kinetics, microstructure, and mechanical properties of these steels. The study finds that increasing Nb content inhibits and then accelerates the transformation kinetics of both ferrite and bainite. However, the effects of Nb on ferritic and bainitic transformations are different. Additionally, the strengthening mechanisms of Nb differ between ferritic and bainitic steels, with precipitation strengthening predominant in ferritic steels and dislocation strengthening and phase transformation strengthening being major sources in bainitic steels. Moreover, the addition of Nb reduces the work hardening capacity of both ferritic and bainitic steels.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zhihui Wang, Zhongwu Jian, Zhonggang Sun, Anru Wu
Summary: This study presents a Nb2MoWC0.7 hypoeutectic alloy with excellent strength and plasticity, featuring a high engineering yield strength of 1.47 GPa, compressive strength of 1.95 GPa, and plastic strain of 10.6%. The abundant primary soft BCC improves room-temperature plasticity, while the eutectic structures with semi-coherent BCC/NbC interface enhance strength mainly through interfacial-dependent strengthening.
Article
Materials Science, Ceramics
Bharti, Gulzar Ahmed, Yogesh Kumar, Shatendra Sharma
Summary: Density functional theory calculations were used to investigate the density of states and quantum capacitance of pure and doped niobium nitrides. The results show that NbN is a promising candidate for supercapacitor electrodes, and doping with cobalt can significantly increase the quantum capacitance.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
N. An, Y. N. Sun, L. Gao, Y. D. Wu, J. N. Xue, Z. R. Li, X. D. Hui
Summary: This study comprehensively investigated the microstructure and mechanical properties of long-term aged CoCrNi medium entropy alloys (MEAs) at both room and high temperatures. The results showed that the aged MEAs maintained a single gamma phase, nanoparticulate and discontinuous block gamma' phase, and eta-Ni-3(Ti,Ta) phase in various shapes. These aged MEAs exhibited comparable strengths to those treated under standard heat treatment, while surprisingly demonstrating superior plasticity. The strengthening mechanisms were attributed to dislocation accumulation, formation of stacking faults, and nanotwinning induced by precipitation of gamma' and eta phases.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Anze Bajzelj, Barbara Setina Batic, Jozef Medved, Jaka Burja
Summary: The influence of nickel content and cooling rate on the precipitation of niobium nitride in as-cast stainless steels was analyzed. Niobium microalloying is crucial for mechanical properties and corrosion prevention in stainless steels. The solubility of nitrogen in the melt increased as the proportion of nickel in the solution decreased, resulting in a lower formation of primary and eutectic niobium carbonitrides.
Article
Materials Science, Multidisciplinary
Xinpan Yu, Huibin Wu, Youyou Zhang, Rui Yuan, Yang Gu, Yuhui Feng
Summary: The addition of niobium improves the thermal stability and mechanical properties of bainitic steels, especially at low temperatures. After tempering, MC-type carbides contribute positively to the strength and elongation of the bainitic steel, but may detrimentally affect its impact toughness.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Ceramics
Jinming Li, Runwu Zhu, Jieyan Yuan, Xiangrong Lu, Sumei Zhao, Mingyi Xu, Jingqi Huang, Yunwei Tu, Jianing Jiang, Longhui Deng, Li Liu, Shujuan Dong, Xueqiang Cao
Summary: This study focuses on the effect of moisture degradation on the properties of nanostructured yttria stabilized zirconia coatings deposited by atmospheric plasma spraying. The results show that hydrothermal degradation significantly affects the microstructure and mechanical properties of the coatings.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Jianan Chen, Wangwang Ding, Qiying Tao, Chuanzhen Ma, Cong Zhang, Gang Chen, Mingli Qin, Xuanhui Qu
Summary: This study successfully fabricated Nb521 parts using jet-milled HDH powders modified by LPBF, achieving almost full densification after HIP treatment. Nanoscale ZrO2 precipitates were found in the LPBFed and HIPed parts, which were related to the thermal distribution and solidification rate during LPBF. The LPBFed Nb521 parts showed sound tensile properties after HIP, and the precipitated ZrO2 underwent plastic deformation after tension.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Ceramics
Jinshuang Wang, Mengdi Chen, Yiyan Xu, Luyao Chen, Yongsheng Yu, Junbin Sun, Yinghui Wang, Bing Liu, Qiangshan Jing
Summary: CeO2 and Sc2O3 co-stabilized ZrO2 ceramics have been studied for their potential application as thermal barrier coatings materials above 1300 degrees C. The Sc0.04Ce0.16Zr0.80O1.98 (4S16CZ) ceramic material showed superior performance in stability and thermal properties in high-temperature environments, suggesting its potential as a promising TBC material.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Ellen Suhr, Olga A. Krysiak, Valerie Strotkoetter, Felix Thelen, Wolfgang Schuhmann, Alfred Ludwig
Summary: High-entropy nitrides are a class of unexplored materials with good mechanical properties, high stability against chemicals, and promising electrocatalytic performance. In this study, a high-entropy nitride system (Ti-Co-Mo-Ta-W)N is investigated, which combines binary and ternary nitrides showing good water-splitting activities. Thin-film materials libraries with continuous composition spreads are deposited using reactive cosputter deposition. The films exhibit a single-phase solid solution structure and low resistivity values. The oxygen evolution reaction activity of the (Ti-Co-Mo-Ta-W)N films is measured, and the results indicate that stability is a challenge for high-entropy nitrides in oxygen-related electrocatalytic reactions. The reactive sputtering method is used to prepare high-entropy nitride materials libraries, which serve as a test platform for studying the stability of nitride films during catalytic applications.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Junyu Tian, Houxin Wang, Min Zhu, Mingxing Zhou, Qi Zhang, Xue Su, Aimin Guo, Guang Xu
Summary: The combined addition of niobium and vanadium has shown to enhance the strength of high-carbon pearlitic steels without compromising toughness. Replacing part of vanadium with niobium can lead to improved comprehensive mechanical properties and finer microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Chang-Yu Hung, Stoichko Antonov, Paul D. Jablonski, Martin Detrois
Summary: Alloys based on Inconel 725 with elevated levels of Nb and Ta were studied for their phase stability and transformation after aging and long-term exposure at 700 degrees C for 10,000 hours. Scanning electron microscopy and transmission electron microscopy were used to characterize the microstructure changes. The results showed that the addition of Nb/Ta promoted the formation of gamma '/gamma'' co-precipitates in the low Ti/Al ratio alloy, while only gamma '' precipitates were present in the high Ti/Al ratio counterpart. After 10,000 hours exposure, complex geometrical closed-packed (GCP) phases formed from the gamma'/gamma'' co-precipitates in a layer-by-layer manner, with plate-like delta phase precipitates decorated by blocky alpha-Cr and enveloped by a wavy gamma ' film.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
B. Vishwanadh, N. Naveen Kumar, G. Samyuktha, Vijay Kaushik, R. Tewari
Summary: In this study, a new thermo-mechanical processing route with reduced deformation temperature was developed for Nb-5Mo-1Zr-0.1C alloy. The alloy was processed through warm rolling and cold rolling routes, and both routes showed similar mechanical properties due to the nearly identical microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Thermodynamics
N. R. Mediukh, V. I. Ivashchenko, P. E. A. Turchi, V. Shevchenko, Jerzy Leszczynski, Leonid Gorb
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
(2019)
Article
Materials Science, Ceramics
A. M. Kasumov, K. O. Shapoval, V. M. Karavayeva, E. I. Olifan, S. V. Radchuk
POWDER METALLURGY AND METAL CERAMICS
(2020)
Article
Chemistry, Physical
Olga Maksakova, Richard F. Webster, Richard D. Tilley, Volodymyr I. Ivashchenko, Bogdan O. Postolnyi, Oleksandr Bondar, Yoshihiko Takeda, Vladyslav M. Rogoz, Rimma E. Sakenova, Pawei Zukowski, Marek Opielak, Vyacheslav M. Beresnev, Alexander D. Pogrebnjak
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Chemistry, Physical
L. Yate, L. Martinez-de-Olcoz, V. I. Ivashchenko, A. Pshyk, E. Coy, J. Esteve, A. Lousa
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Nanoscience & Nanotechnology
A. Synytsia, O. Sych, A. Iatsenko, T. Babutina, T. Tomila, O. Bykov, O. Olifan, T. Lobunets, A. Perekos, N. Boshytska
Summary: Magnetite nanopowders were synthesized using chemical precipitation and thermal decomposition methods, with the synthesis time not significantly affecting phase composition. Increasing chemical precipitation time led to a decrease in specific saturation magnetization and coercive force, while thermal decomposition significantly improved magnetic properties.
APPLIED NANOSCIENCE
(2022)
Article
Materials Science, Multidisciplinary
A. A. Onoprienko, V. I. Ivashchenko, P. L. Scrynskyy, A. M. Kovalchenko, A. O. Kozak, A. K. Sinelnichenko, E. I. Olifan, M. Tapajna, L. Orovc
Summary: Films in the Ti-B-C system were deposited onto Si (100) substrates using dual direct current magnetron sputtering of Ti-B and graphite targets. The carbon content in the films, as controlled by the sputtering current at the graphite target, influenced the film hardness and friction coefficient. Experimental results suggest that the deposited Ti-B-C films consist of nanocrystals of solid solution TiB2-xCx surrounded by an amorphous B-C-O phase.
Article
Chemistry, Physical
Alexander Pogrebnjak, Vladimir Buranich, Volodymyr Ivashchenko, Lazat Baimoldanova, Krzysztof Rokosz, Steinar Raaen, Pawel Zukowski, Marek Opielak, Bauyrzhan Rakhadilov, Vyacheslav Beresnev, Nazgul Erdybaeva
Summary: This study examines the mechanical and tribological properties of TiA-SiYN/CrN system for cutting machinery. The experimental data suggests that samples prepared with Cr plasma treatment without Cr interlayer exhibit improved wear, crack resistance, and adhesion to the substrate.
SURFACES AND INTERFACES
(2022)
Article
Quantum Science & Technology
L. A. Myroniuk, M. G. Dusheyko, V. A. Karpyna, D. Myroniuk, O. Bykov, O. Olifan, O. F. Kolomys, V. V. Strelchuk, A. A. Korchovyi, S. P. Starik, V. M. Tkach, A. I. Ievtushenko
Summary: In this study, the properties of thermally annealed Cu-Al-O thin films were examined. It was found that after annealing at 900 degrees C, only CuAl2O4 phase existed in the films, and the highest RMS roughness was observed under fast cooling conditions. Additionally, the CuAl2O4 films showed excellent photocatalytic degradation performance, indicating their potential for practical applications.
SEMICONDUCTOR PHYSICS QUANTUM ELECTRONICS & OPTOELECTRONICS
(2022)
Article
Physics, Condensed Matter
V. I. Ivashchenko, P. E. A. Turchi, N. Yu Pavlova, Leonid Gorb, Jerzy Leszczynski
Summary: The structural transformations, mechanical properties, electronic structure, and lattice dynamics of several phases and hypothetical structures of NaCl-NbN, anti-TiP-NbN, anti-NiAs-NbN, WC-NbN, and TiP-NbN were studied using first-principles calculations and molecular dynamics simulations. The possible mechanisms of phase transitions between these structures were proposed based on the condensation of specific phonon modes and subsequent spontaneous strains. The e, ?, d', and cP2-221 structures were found to be brittle materials with high shear moduli, Young moduli, Vickers hardness, fracture toughness, and Debye temperatures.
PHYSICA B-CONDENSED MATTER
(2023)
Review
Physics, Condensed Matter
A. A. Onoprienko, V. I. Ivashchenko, V. I. Shevchenko
Summary: The review summarizes the findings of theoretical and experimental investigations on the structure, atomic bonding, mechanical properties, thermal stability, and oxidation and corrosion resistance of films made of ternary transition metal borides.
CONDENSED MATTER PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
V. I. Ivashchenko, A. A. Onoprienko, P. L. Skrynskyy, A. O. Kozak, A. K. Sinelnichenko, E. Olifan, P. M. Lytvyn, O. K. Marchuk
Summary: Ti-Al-C and Ti-Al-Si-C films were deposited on Si(100) substrates using dual DC magnetron sputtering, and the effects of sputtering current and annealing temperature on the properties of the films were studied. The films exhibited amorphous structure with low roughness values, and annealing at 800 degrees C led to the formation of crystalline phases. The hardness of the films increased with increasing sputtering current, attributed to the evolution of chemical bonds.
JOURNAL OF SUPERHARD MATERIALS
(2021)
Proceedings Paper
Nanoscience & Nanotechnology
A. O. Kozak, V. I. Ivashchenko, O. K. Porada, L. A. Ivashchenko, O. O. Sytikov, V. S. Manzhara, T. Tomila
MICROSTRUCTURE AND PROPERTIES OF MICRO- AND NANOSCALE MATERIALS, FILMS, AND COATINGS (NAP 2019)
(2020)
Article
Materials Science, Multidisciplinary
A. O. Kozak, V. I. Ivashchenko, P. L. Scrynskyy, V. B. Muratov, V. V. Tetyorkin, A. Sukach, O. K. Sinelnichenko, O. Olifan
JOURNAL OF SUPERHARD MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
O. K. Porada, V. I. Ivashchenko, L. A. Ivashchenko, A. O. Kozak, O. O. Sytikov
JOURNAL OF SUPERHARD MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
A. A. Onoprienko, V. I. Ivashchenko, P. L. Scrynskyy, A. K. Sinelnichenko, A. A. Kozak, A. M. Kovalchenko, E. Olifan
JOURNAL OF SUPERHARD MATERIALS
(2020)
