Article
Materials Science, Multidisciplinary
Norhuda Hidayah Nordin, Leong Zhaoyuan, Russell Goodall, Iain Todd
Summary: Control over a lamellar-like-structured high entropy alloy system can be achieved by replacing aluminum with boron. The addition of boron influences the microstructure and phase formation, and the presence of Fe2B phase correlates with interfacial energy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Jiaojiao Yi, Lin Yang, Mingqin Xu, Lu Wang, Lisha Liu, Long Zeng
Summary: In this study, the phase components, microstructures, and compressive properties of a novel 3D transition metal high entropy alloy CuFeNiTiV in the as-cast condition were investigated. The thermodynamic simulations revealed the order of phase separation during solidification, which was confirmed by XRD analysis of the alloy's phase components. The outstanding fracture strength of 2086 MPa in the as-cast alloy was attributed to the deformation resistance of both the major BCC phase and laves phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
X. J. Gao, L. Wang, N. N. Guo, L. S. Luo, G. M. Zhu, C. C. Shi, Y. Q. Su, J. J. Guo
Summary: This paper investigates the effects of Cr addition on the microstructure, phase constitutes, and mechanical properties of the Hf0.5Mo0.5NbTiZr refractory high-entropy alloy. The addition of Cr refines the dendritic structure, increases the strength, and influences the plasticity of the alloy. Homogenization treatment promotes the formation of Laves phase and significantly enhances the strength of the alloy.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Haofeng Lei, Xicong Ye, Jiaxing Feng, Junchao Chen, Zhongheng Diao, Dong Fang, Bo Li, Guangwei Zhao, Renci Liu
Summary: A series of low-cost CrFeNiBx (x = 0, 0.05, 0.1, 0.15, 0.2, 0.25, and 0.3) High Entropy Alloys (HEAs) without the Co element were investigated to study the effect of boron (B) content on the microstructure evolution, phase formation regulation, and compression properties. The results show that with the addition of B content, the microstructure of the alloys transforms and exhibits improved mechanical properties. This study is significant for the development of high entropy alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Venkata Ashish Srivatsav Kondapalli, N. Narasaiah, B. Srinivasarao
Summary: The microstructure and mechanical properties of FeNiMnCuAlTi alloys were studied by varying the elemental composition. Equiatomic composition showed different phases, while the addition of different elements had different effects. Alloys rich in Cu and Ni showed more FCC phase, while the addition of Al and Ti favored the formation of intermetallic phases. Alloys rich in Fe, Ni, Cu, and Mn showed good plasticity, while samples rich in Al and Ti were extremely brittle. High-entropy alloys exhibited high strength and moderate plasticity, while medium entropy alloys had lower strength but higher plasticity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Hailong Huang, Yan Sun, Peipei Cao, Yuan Wu, Xiongjun Liu, Suihe Jiang, Hui Wang, Zhaoping Lu
Summary: This study extensively investigated the phase stability of high entropy alloys (HEAs) at intermediate temperatures and found that the effect of cooling rates on refractory HEAs depends on the alloy composition and material properties. This provides a new approach for optimizing the properties of HEAs.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Li Bai, Yunzi Liu, Yangyang Guo, Yukun Lv, Tingting Guo, Jian Chen
Summary: The microstructure and mechanical properties of high-entropy alloys (Fe40Mn40Ni10Cr10)100-xAlx (x = 0, 5, 8, 10, 15, 20) were investigated. With increasing Al content, the phase structure of the alloys changed, resulting in increased strength but decreased ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Hiroyuki Watanabe, Toru Murata, Shunsuke Nakamura, Naoko Ikeo, Toshiji Mukai, Koichi Tsuchiya
Summary: Cold-working was found to facilitate the formation of sigma phase in CrMnFeCoNi alloy under specific heat treatment conditions. The resulting sigma-body-centered cubic (BCC) aggregates consist of sigma phase spines and BCC particles, forming rapidly at the face-centered cubic/sigma interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Materials Science, Multidisciplinary
Wei Zhang, Ali Chabok, Bart J. Kooi, Yutao Pei
Summary: This article summarizes the microstructure characteristics, mechanical properties, and functional properties of additive manufactured high entropy alloys (HEAs), providing a fundamental understanding of this research field. The article also discusses the current challenges and future work in this area.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Xin Lin, Mingliang Wang, Guangyu Ren, Dongxu Qiao, Yiping Lu, Tongmin Wang, Tingju Li
Summary: Eutectic high entropy alloys (EHEAs) with a novel system were investigated, featuring a bimodal eutectic microstructure. The fully eutectic composition exhibited the best mechanical properties in terms of compressive yield strength, fracture strength, and engineering strain.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
E. Panina, N. Yurchenko, A. Tojibaev, M. Mishunin, S. Zherebtsov, N. Stepanov
Summary: This study investigates the structure and mechanical properties of refractory high-entropy alloys, showing that a dual-phase structure can enhance both strength and ductility while exhibiting a yield stress anomaly under certain conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Jiaojiao Yi, Lu Wang, Mingqin Xu, Lin Yang
Summary: Two 3d transition metal high-entropy alloys, AlCrCuFeX (X=Ti, V), were prepared by a vacuum arc-melting method and studied for their phase components, microstructures, and compressive properties. The alloy with X=V exhibited good synergy in strength and plasticity, with a high ultimate strength of 2138 MPa and a plastic strain of 7.1%, while the X=Ti alloy showed deteriorated strength and ductility due to a cleavage fracture mechanism caused by the Laves phase. The high hardness of the AlCrCuFeX alloys with X=Ti and V was significantly larger than that of the alloy with X=Ni.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Jiaojiao Yi, Lu Wang, Song Tang, Lin Yang, Mingqin Xu, Lisha Liu
Summary: The novel 3d transition metal high entropy alloy Al0.5CoCuNiTi exhibited a promising trade-off in strength and plasticity in both as-cast and annealed states, with a combination of FCC and BCC phase structures. The alloys showed high yield strength and compressive strain, with the BCC phase as the dominant phase and the FCC phase wrapping around it. The mechanical behavior was justified by the combination of phase constitution, morphology, and solid-solution strengthening.
PHILOSOPHICAL MAGAZINE
(2021)
Article
Chemistry, Physical
Yu Ji, Long Zhang, Xing Lu, Huameng Fu, Zhengwang Zhu, Hong Li, Hongwei Zhang, Haifeng Zhang
Summary: A series of high Fe-content and Co-free Fe4CrNi(AlTi)(x) high-entropy alloys were designed and the effects of Al and Ti content on microstructures and tensile properties were investigated, revealing a correlation between alloy composition and performance. The Fe4CrNi(AlTi)(0.6) alloy showed a good combination of high strength and large ductility, attributed to the optimal distribution of phases and nanoparticle reinforcements.
Article
Chemistry, Physical
Shiyu Wu, Dongxu Qiao, Hongliang Zhao, Jun Wang, Yiping Lu
Summary: This study investigated the effect of Mo2C addition on the phase composition, microstructure evolution, and mechanical properties of NbTaW0.5(Mo2C) RHEAs. The results showed that the addition of Mo2C significantly improved the mechanical properties of the alloys, with NbTaW0.5(Mo2C)(0.2) RHEA reaching a yield strength exceeding 1000 MPa at 1473 K. The RHEAs exhibited good plasticity and promising application prospects.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Bogdan Antoszewski, Oksana P. Gaponova, Viacheslav B. Tarelnyk, Oleksandr M. Myslyvchenko, Piotr Kurp, Tetyana I. Zhylenko, Ievgen Konoplianchenko
Summary: This paper explores the possibility of using the electrospark alloying (ESA) method to obtain boron-containing coatings with increased hardness and wear resistance. A new method involving the application of grease with aluminum powder and amorphous boron, followed by processing with the ESA method, is proposed. Studies show that increasing discharge energy leads to higher microhardness values in the coatings. The phase composition of the coatings changes with different discharge energies, with the presence of solid solutions and intermetallics Fe4Al13 and borocementite Fe-3 (CB) at higher energies.
Article
Materials Science, Ceramics
Igor Petrusha, Chawon Hwang, Tatiana Prikhna, Metin Ornek, Dexin Zhao, Kelvin Y. Xie, Richard A. Haber, Myroslav Karpets, Semyon Ponomaryov, Sergey Dub, Viktoer Moshchil
Summary: By combining the use of emulsion detonation and high-pressure high-temperature transformation-assisted consolidation, a novel route to synthesize superhard bulk nanocrystalline cubic boron nitride (cBN) has been demonstrated. The synthesized cBN displayed Vickers hardness values of 50-62 GPa for 5-20 N loads, showing potential for practical applications. This method offers a feasible solution to synthesize bulk nanocrystalline cBN in a more scalable way, providing insights on refining grain growth and enhancing densification for bulk nanocrystalline materials synthesis.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
O. V. Sobol, V. F. Gorban, N. A. Krapivka, T. G. Rogul, S. A. Firstov
Summary: The study examined the effects of phase composition, type II microstresses, and coherent scattering domains (CSDs) on the hardness and Young's modulus of multicomponent bcc solid solutions. The results showed that even a small change in chemical composition led to noticeable changes in lattice parameter, microhardness, and Young's modulus. It was observed that alloys with high mismatch in atomic sizes exhibited the greatest type II microstresses and minimum CSD sizes.
POWDER METALLURGY AND METAL CERAMICS
(2021)
Article
Materials Science, Ceramics
Ostap Zgalat-Lozynskyy, I Kud, L. Ieremenko, L. Krushynska, D. Zyatkevych, K. Grinkevych, O. Myslyvchenko, V Danylenko, S. Sokhan, A. Ragulya
Summary: A Si3N4-ZrN wear-resistant self-healing composite material with excellent material properties and self-healing capability has been developed.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Oleksandr Myslyvchenko, Roman Litvyn, Larisa Krushynska, Ostap Zgalat-Lozynskyy
Summary: This study investigates the influence of microwave heating on the oxidation process of Vietnamese ilmenite ore and finds that microwave irradiation can accelerate the growth rate of the pseudobrookite phase. The addition of sucrose can reduce the iron content in the obtained pseudobrookite-rutile mixture.
Correction
Materials Science, Multidisciplinary
Oleksandr Myslyvchenko, Roman Litvyn, Larisa Krushynska, Ostap Zgalat-Lozynskyy
Article
Physics, Applied
Leonid R. Shaginyan, Mikhail I. Mironov, Sergey A. Firstov, Nicolay A. Krapivka, Valery V. Kremenitsky, Viktor N. Novichenko
Summary: The composition and microstructure of the targets used in magnetron sputtering may change during its operation, especially in the case of multicomponent alloys. The study of the grooves formed on the targets over time provides information about the sputtered region and helps predict changes in the film properties. The experiments conducted on CoCrCuFeNi, CoCrCuFeMnNi, and AlCoCrCuFeNiV high-entropy alloys revealed signs of melting, a new type of preferential sputtering effect, and the formation of specific microrelief on the target surface.
EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Oksana P. Gaponova, Viacheslav B. Tarelnyk, Bogdan Antoszewski, Norbert Radek, Nataliia V. Tarelnyk, Piotr Kurp, Oleksandr M. Myslyvchenko, Jacek Hoffman
Summary: This paper introduces a new method of surface modification based on the electrospark alloying (ESA) method. A carburizer containing nitrogen-carbon components is used to produce coatings. The new processes propose the use of paste-like saturating media containing nitrogenous and nitrogenous-carbon components, which are applied onto the surface without waiting for them to dry. The ESA process is then conducted using a steel or graphite electrode-tool. It is found that by increasing the discharge energy, the thickness, micro hardness, continuity, and surface roughness of the white layer coatings increase, resulting in the saturation of the steel surface with nitrogen and/or carbon, the formation of non-equilibrium structures and special phases. Furthermore, the application of an aluminum layer through the ESA method before applying the saturating media enhances the thickness, micro hardness, and continuity of the white layer, with insignificant changes in surface roughness.
Article
Materials Science, Multidisciplinary
O. M. Myslyvchenko, V. F. Gorban', A. V. Samelyuk, M. O. Krapivka
Summary: By using the arc-melting method, a high-entropy boride is obtained by adding boron powder to the Ti30Zr25Hf15Nb20Ta10 alloy. X-ray phase diffraction analysis shows that the Ti30Zr25Hf15Nb20Ta10 alloy is a single-phase alloy with body-centered cubic (bcc) structure, while the main phase of the Ti15.8Zr13.4Hf7.8Nb10.5Ta5.3B47.2 alloy is MeB boride with a small amount of bcc and hexagonal close-packed structures. The microstructure analysis reveals that the addition of boron leads to the segregation of constituent components and increases hardness, modulus of elasticity, and yield strength.
Article
Materials Science, Ceramics
O. M. Myslyvchenko, R. V. Litvin, O. B. Zgalat-Lozynskyy
Summary: The chemical and phase composition of ilmenite concentrate from the Irshansk deposit was determined. Microwave heating was used to oxidize the concentrate, leading to the formation of rutile and increased amount of pseudobrookite. The interaction with air during heating resulted in surface oxidation of the material and release of iron oxide. The study also found that additional grinding of the concentrate increased the heating and oxidation temperatures during microwave processing.
POWDER METALLURGY AND METAL CERAMICS
(2022)
Article
Materials Science, Multidisciplinary
Oksana P. Gaponova, Viacheslav B. Tarelnyk, Nataliia V. Tarelnyk, Oleksandr M. Myslyvchenko
Summary: A new method of nanostructuring of surfaces using electrospark alloying method and special processing media with carbon nanotubes is proposed. The influence of ESA regimes and the composition of SPM on the microstructure and hardness of the coatings is considered. The addition of nanotubes helps increase continuity, thickness, and hardness of the coatings.
Article
Engineering, Industrial
I. Petryk, R. Liutyi, A. Kocheshkov, A. Myslyvchenko, D. Liuta
Summary: The aim of this study is to investigate the physical and chemical conditions of self-hardening aluminum phosphate binders based on orthophosphoric acid and fine-grained aluminum powder, and the properties of core mixtures for foundry production. X-ray phase analysis and differential thermogravimetric analysis were used. The results showed that a chemical interaction occurs between orthophosphoric acid and finely dispersed aluminum powder at ambient temperature, forming a phosphate binder. The core mixtures have good thermal stability and can be used in a temperature range of 20 to 1000 °C.
ADVANCES IN INDUSTRIAL AND MANUFACTURING ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
O. M. Sydorchuk, O. M. Myslyvchenko, K. O. Gogaev, Hongguang Ye
Summary: This study investigates the application of pressed steel with adjustable austenitic transformation in hot deformation processes and examines the effects of heat treatment temperature modes on the crystal structure and mechanical properties of the steel. A comparison with other forged die steels is made to provide recommendations for the use of this steel within a specific temperature range. Furthermore, the tempering temperature mode for the steel is justified.
Article
Materials Science, Multidisciplinary
V. B. Tarelnyk, O. P. Gaponova, Ye Konoplianchenko
Summary: The article reviews and analyzes the current scientific research on surface treatment of metal surfaces using concentrated energy fluxes. It focuses on the electric-spark alloying method and its impact on the quality of the carburized layer. The research found that using non-abrasive ultrasonic finishing and staged energy discharge can improve the quality of the carburized layer. Additionally, applying graphite powder before alloying can increase the continuity and depth of diffusion in the alloyed layer, as well as fill the pores in the near-surface layer with free graphite, improving the operating characteristics of the friction-pairs parts.
USPEKHI FIZIKI METALLOV-PROGRESS IN PHYSICS OF METALS
(2022)
Article
Engineering, Industrial
R. Liutyi, I. Petryk, M. Tyshkovets, O. Myslyvchenko, D. Liuta, M. . Fyodorov
Summary: The results of theoretical and practical research on the synthesis of sodium phosphates and their use as binders in the manufacture of molds and cores were presented. The interaction of orthophosphoric acid with different sodium salts was analyzed to find various methods of sodium phosphate synthesis. The study established thermodynamic parameters and demonstrated the successful synthesis of sodium phosphate through the chemical reaction of orthophosphoric acid with sodium chloride. It was found that sodium tripolyphosphate forms the strongest binder. The synthesized sodium phosphates have optimal properties for foundry technologies, providing high strength and thermal stability.
ADVANCES IN INDUSTRIAL AND MANUFACTURING ENGINEERING
(2022)
