Article
Materials Science, Multidisciplinary
T. Gancarz, A. Dobosz, A. -A. Bogno, G. Cempura, N. Schell, R. Chulist, H. Henein
Summary: This study investigated the thermophysical properties and rapid solidification of Al5.0Mg0.2Sc alloys with varying Li content using discharge crucible and Impulse Atomization techniques. It was found that density and surface tension decrease with increasing Li content, while viscosity increases due to short-range ordering in intermetallic phases. The analysis revealed the precipitation of Al3Sc and Al2MgLi phases in both alloy compositions, as well as the presence of AlLi precipitates in the Al5.0Mg0.2Sc6.0Li alloy, consistent with the phase diagram.
MATERIALS CHARACTERIZATION
(2021)
Article
Energy & Fuels
Joanna Czub, Akito Takasaki, Andreas Hoser, Manfred Reehuis, Lukasz Gondek, Eugenio Meloni
Summary: The mechanically alloyed amorphous alloys of the Ti45-xVxZr38Ni17 composition have the ability to form a quasicrystalline state after thermal treatment. The amorphous and quasicrystal alloys belonging to the Ti45-xVxZr38Ni17 family can store hydrogen with gravimetric densities above 2 wt.%. Research on the Ti45-xVxZr38Ni17 system with vanadium doped instead of titanium revealed that the amorphous samples with moderate doping (x < 20) can absorb hydrogen while remaining in the amorphous state and transform into a novel glassy-quasicrystal phase during annealing.
Article
Materials Science, Multidisciplinary
Domonkos Tolnai, Sarkis Gavras, Fabian Wilde, Jorg U. Hammel, Stefan Bruns
Summary: The directional solidification of an Elektron 21 magnesium alloy was investigated using in situ synchrotron radiation tomography. The growth of secondary dendrite arms and coarsening of existing dendrite arms were observed during the solidification process, with the contrast between rare-earth metals and Mg enabling quantitative analysis of changes in morphology.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Phillip Dumitraschkewitz, Matheus A. Tunes, Cameron R. Quick, Diego Santa Rosa Coradini, Thomas M. Kremmer, Parthiban Ramasamy, Peter J. Uggowitzer, Stefan Pogatscher
Summary: The solidification behavior of a eutectic AlCu specimen is investigated using in situ scanning transmission electron microscope experiments. By varying the cooling conditions, different rapid solidification morphologies are obtained. Additionally, the spheroidization of lamellas during annealing at elevated temperatures is studied.
Article
Nanoscience & Nanotechnology
Tomoya Nagira, Terumi Nakamura, Fumiyoshi Yoshinaka, Takahiro Sawaguchi, Yasuhiro Aoki, Masayoshi Kamai, Hidetoshi Fujii, Akihisa Takeuchi, Masayuki Uesugi
Summary: In this study, the dendrite-scale microstructural evolution of Fe-Mn-Si alloys during TIG spot welding was observed using high-spatial resolution X-ray imaging and diffraction. The solidification mode was found to significantly influence the susceptibility to solidification cracking.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Manjin Kim, Xin Fu Tan, Qinfen Gu, Stuart D. McDonald, Yahia Ali, Syo Matsumura, Kazuhiro Nogita
Summary: In this study, the hydrogen sorption behavior of Mg-5%La alloy after the first absorption was investigated using in-situ synchrotron Powder X-ray Diffraction (PXRD) and in-situ High Voltage Transmission Electron Microscopy (HVTEM). Two distinct phase evolutions were identified during the desorption process: continuous transformation of LaH3 into LaH2+1/2 H2 starting from 250 degrees C, and decomposition of MgH2 into Mg+H2 between 440 and 460 degrees C. It was determined that the alloy is cyclable in the subsequent absorption/desorption cycling after the first hydrogen absorption, without the involvement of Mg12La intermetallic.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Nanoscience & Nanotechnology
Yunhe Zheng, Laure Bourgeois, Jian-Feng Nie
Summary: This study investigated the structure of precipitates in Mg-Zn-Al alloys, revealing new structural features and proposing that the rod-shaped precipitates can be described by tiling of different shapes.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Lakshmi Ravi Narayan, Rainer Hebert
Summary: The rapid solidification behavior of binary aluminum copper alloys in the hypoeutectic range has been studied in this work. A chip-based calorimeter was used to achieve cooling rates up to 40,000°C/s. The data from calorimetry was utilized to produce fraction of solid curves, which are important for metal manufacturing processing models. The results showed higher undercoolings than predicted for growth-based rapid solidification, but not as high as those predicted for homogeneous nucleation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Jiangfeng Song, Jing Chen, Xiaoming Xiong, Xiaodong Peng, Daolun Chen, Fusheng Pan
Summary: In 2021, over 4000 papers on Mg and Mg alloys were published and indexed in the Web of Science (WoS) Core Collection database. The main research focus was on the microstructure, mechanical properties, and corrosion of Mg alloys. Mg ion batteries and hydrogen storage Mg materials attracted significant attention. Chinese universities and research institutions, along with institutions from Germany, the United States, Australia, Japan, Korea, and Iran, made important contributions to the research and development of magnesium alloys.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Review
Metallurgy & Metallurgical Engineering
Yan Yang, Xiaoming Xiong, Jing Chen, Xiaodong Peng, Daolun Chen, Fusheng Pan
Summary: This article provides a comprehensive summary of the developments in the structural and functional properties of magnesium and magnesium alloys in 2022. The results of bibliometric analyses show that the microstructure, mechanical properties, and corrosion of magnesium alloys remain the main research focus. Additionally, the article highlights the increasing interest in bio-Mg materials, Mg ion batteries, and hydrogen storage Mg materials.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Chemistry, Physical
Adam Debski, Sylwia Terlicka, Magda Peska, Agnieszka Bigos, Wladyslaw Gasior, Wojciech Gierlotka, Marek Polanski
Summary: In this paper, the interactions between mechanically alloyed Mg6Pd1-xAgx alloys and hydrogen were studied. The structures of the alloys were analyzed using X-ray diffraction (XRD), which confirmed the presence of a single Mg6Pd-type phase for samples with up to x=0.5 silver concentration. The kinetics of hydrogenation process and the properties of synthesized hydride were investigated using a Sievert-type sorption analyzer and differential scanning calorimetry (DSC) with thermogravimetric analysis (TGA). The results showed that partial substitution of palladium with silver improved the hydrogen sorption kinetics compared to pure Mg6Pd intermetallic phase, but resulted in lower hydrogen content. The influence of silver on the decomposition kinetics was also observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Metallurgy & Metallurgical Engineering
Amjad Javaid, Frank Czerwinski
Summary: This report discusses global efforts in expanding manufacturing capabilities of magnesium sheet through twin roll casting path, emphasizing on the application of this technology in magnesium materials and potential directions for development. Special attention is paid to the research progress in magnesium twin roll casting at CanmetMATERIALS in Canada.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Chemistry, Physical
Xin F. Tan, Manjin Kim, Qinfen Gu, Julio Pinzon Piraquive, Guang Zeng, Stuart D. McDonald, Kazuhiro Nogita
Summary: This study investigates the effects of Na in hypo-eutectic Mg-lwt.%Si alloys for H-2 storage applications. The addition of trace amounts of Na is vital in improving the H-2 sorption kinetics, achieving a high storage capacity. The study also analyzes the hydrogen sorption mechanisms and identifies the role of Na in facilitating hydrogen diffusion.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Qiang Yang, Xiaohan Wu, Wei Zhang, Zixaing Yan, Guodong Tong, Xuegang Chen, Shuhui Lv, Tao Xu, Jun Li, Xin Qiu
Summary: An ultrathin wall Mg-8Zn-8Al alloy with coarse ix-Mg grains, ultra-fine beta-Mg grains, and nano-sized icosahedral quasicrystal phase particles has been manufactured by high-pressure die casting. The alloy exhibits outstanding strength and acceptable elongation. The observations through HAADF-STEM reveal possible amorphous regions, C-containing phase and/or MgO aggregations, and Zn-rich clusters and pyramidal precipitates. The combination of ultra-fine grains and the skeleton consisting of nano-sized I-phase particles and solutes contributes to the ultra-high strength. In addition, the study indicates the unavoidable interaction of alloy melt with CO2 during ultra-thin wall HPDC and the possibility of pyramidal precipitation in Zn-containing magnesium alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Lei Wang, Dong -Rong Liu, Tian Chen, Shaofan Wang, Yang Cao
Summary: Adding low-cost aluminum element to Mg-RE alloy can significantly refine the grain structure in the laser surface remelting process and improve the thermal stability by forming nanoscale intermetallic compounds.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
V. V. Berezovets, R. Denys, I. Yu Zavaliy, Yu Kosarchyn
Summary: MgH2-based nanocomposites were synthesized using reactive ball milling and various catalytic additives. The additives improved the hydrogen absorption-desorption kinetics and stability of the composites. Nano-Ti showed the most stable hydrogen absorption-desorption characteristics compared to TiO2 and Ti4Fe2Ox additives.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Vladimir E. Antonov, Vladimir K. Fedotov, Alexandre S. Ivanov, Alexander Kolesnikov, Mikhail A. Kuzovnikov, Marek Tkacz, Volodymyr A. Yartys
Summary: Inelastic neutron scattering is an effective tool for studying optical vibrations of hydrogen atoms in metal hydrides. This review focuses on binary hydrides of 3d- and 4d-metals, providing spectral and temperature dependency data and discussing the interaction between metal and hydrogen.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Arif Hariyadi, Suwarno Suwarno, Roman Denys, Jose Bellosta von Colbe, Tor Oskar Saetre, Volodymyr Yartys
Summary: Hydrides of the AB(2) Laves type alloys show efficient hydrogen storage capabilities and are suitable for designing high-performance hydrogen storage devices operating at ambient conditions. Experimental results indicate that the hydrogen absorption and desorption processes are jointly influenced by hydrogen diffusion and grain boundary nucleation, with increasing hydrogen content in the hydride leading to lower activation energies.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Ryan A. Klein, Rafael Balderas-Xicohtencatl, Jan Petter Maehlen, Terrence J. Udovic, Craig M. Brown, Robert Delaplane, Yongqiang Cheng, Roman Denys, Anibal J. Ramirez-Cuesta, Volodymyr A. Yartys
Summary: Intermetallic metal hydrides are essential for hydrogen storage, but those with higher storage capacities are still needed. Neutron vibrational spectroscopy (NVS) was used to study LaNiInHx and CeNiInH1.4, revealing close vibrational features between paired H atoms when x > 0.67. In contrast, no close H contacts were found in CeNiSnH, CeNiSnH2, and CeNiSnD2, demonstrating differences in hydrogen dynamics between the compounds.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Boris P. Tarasov, Artem A. Arbuzov, Alexey A. Volodin, Pavel Fursikov, Sergey A. Mozhzhuhin, Mykhaylo Lototskyy, Volodymyr A. Yartys
Summary: The paper reviews the authors' studies on advanced functional composites of graphene based materials with metals, alloys, intermetallic compounds and their hydrides, and their application in creating hydrogen-storage materials, electrode materials, and highly efficient catalysts. These materials are integrated into hydrogen energy systems for backup electric power and hydrogen-based energy storage.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
A. Kytsya, V Berezovets, Yu Verbovytskyy, L. Bazylyak, V Kordan, I Zavaliy, V. A. Yartys
Summary: In this study, Ni-Co bimetallic nanoparticles were successfully synthesized, and the effects of different Ni contents on particle size and polydispersity were observed. Ni50Co50 showed the highest catalytic activity for the hydrolysis of alkaline NaBH4 solutions. The kinetic studies revealed that the hydrolysis rate increased with higher NaBH4 concentration and decreased with higher pH value of the solution. The activation energy of the reaction decreased with decreasing NaBH4 and catalyst contents.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Volodymyr A. Yartys, Vasyl V. Berezovets, Ponniah Vajeeston, Lev G. Akselrud, Vladimir Antonov, Vladimir Fedotov, Steffen Klenner, Rainer Poettgen, Dmitry Chernyshov, Michael Heere, Anatoliy Senyshyn, Roman V. Denys, Ladislav Havela
Summary: Understanding the relationship between the structure, composition, and hydrogenation properties of intermetallic hydrides is crucial for improving their hydrogen storage performance. The ability to form hydrides and control their interaction with hydrogen is determined by their chemical composition. This study investigated a ScNiSn-based intermetallic hydride using various experimental techniques, including synchrotron and neutron powder diffraction, Mössbauer spectroscopy, hydrogenation, and thermal desorption spectroscopy. Computational calculations were also performed. The study revealed the mechanism of phase-structural transformation and the formation of unique metal-hydrogen bonding in the intermetallic alloy. At high pressures, a TiNiSi-type hydride was formed. The study also showed that scandium behaves similarly to the heavy rare earth metal holmium.
Article
Materials Science, Multidisciplinary
V. V. Berezovets, A. R. Kytsya, T. M. Zasadnyy, I. Yu. Zavaliy, V. A. Yartys
Summary: A composite material based on magnesium hydride and citric acid was synthesized by mechanical milling in an argon atmosphere and used for hydrogen generation in the laboratory. The resulting composite material showed faster hydrogen release in hydrolysis reaction compared to pure MgH2. The effect of the composition on the hydrolysis reaction of MgH2 was studied to determine the optimal composition for hydrogen generation devices. The positive influence of citric acid on the hydrolysis of magnesium hydride was analyzed.
Article
Energy & Fuels
V Yartys, I Zavaliy, V Berezovets, Yu Pirskyy, F. Manilevich, A. Kytsya, Yu Verbovytskyy, Yu Dubov, A. Kutsyi
Summary: An autonomous power supply device based on a 30 W fuel cell stack and a hydrolysis-type hydrogen generator was developed. It included the construction of a hydrogen generation unit, development of an electronic control unit, and performance testing and optimization. The system efficiently generates H-2 using a flat type reactor with Pt catalyst deposited on cordierite as a support and a 10% solution of NaBH4. The electronic control unit effectively regulates the hydrolysis reaction rate and provides the required hydrogen supply to the fuel cell.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Energy & Fuels
Ika Dewi Wijayanti, Volodymyr A. Yartys
Summary: This paper investigates the electrochemical performance of Hf-modified Ti-Zr based AB2 Laves type metal hydride battery anode alloys. The alloys were characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM), and the electrochemical performance was studied through PCT diagrams and electrochemical tests. The Hf content in the alloys affected the phase composition, electrochemical discharge capacities, exchange current densities, H diffusion rates, and hydrogen storage capacity. The presence of Hf resulted in a decrease in discharge capacities and exchange current densities, while the alloy with the lowest Hf content showed the highest H storage capacity. The modification of the intrinsic properties of the alloys with Hf substitution played a role in the observed effects.
JOURNAL OF ENERGY STORAGE
(2023)
Editorial Material
Chemistry, Physical
Volodymyr A. Yartys, Fermin Cuevas
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Volodymyr A. Yartys, Colin J. Webb, Fermin Cuevas
Summary: The paper provides an overview of advanced in situ diffraction studies for probing the structure and reacting mechanisms of hydrogen and energy storage materials. These studies utilize high flux diffraction beam and high resolution measurements to establish the mechanism of phase-structural transformations and their kinetics. Various conditions, such as hydrogen/deuterium pressures and temperatures, as well as different charge-discharge states, are considered. The paper also highlights the contributions of Dr. Michel Latroche and summarises a long-standing collaboration between the co-authors in the field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Energy & Fuels
Ihor Zavaliy, Vasyl Berezovets, Roman Denys, Oleksandr Kononiuk, Volodymyr Yartys
Summary: The catalytic effect of eta-Zr3V3O0.6 mixed suboxide and graphite additives on MgH2 properties in hydrogen storage and generation processes was investigated. Hydride composites were obtained by reactive ball milling and characterized using XRD and SEM. The addition of Zr3V3O0.6 and graphite significantly enhanced hydrogen absorption and desorption rates, as well as lowered the activation energy and desorption temperature. The synthesized composite showed improved kinetics and enhanced hydrogenation capacity, making it a promising material for hydrogen storage. The catalytic composites also exhibited efficient hydrogen generation in hydrolysis reaction. Overall, the research received a rating of 8 out of 10.
JOURNAL OF ENERGY STORAGE
(2023)
Review
Energy & Fuels
Thabang R. Somo, Mykhaylo V. Lototskyy, Volodymyr A. Yartys, Moegamat Wafeeq Davids, Serge Nyallang Nyamsi
Summary: High entropy alloys (HEAs) formed by multi-principal elements show promising hydrogen storage performance. The properties of HEAs are related to their chemical composition and constituent elements, including electronegativity, atomic radii, and valence electron concentration. This review aims to clarify these features by performing systematic analysis of available experimental data. The analysis shows that valence electron concentration plays the most significant role in tuning the hydrogen storage performance of HEAs.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Inorganic & Nuclear
ChuBin Wan, R. Denys, V. A. Yartys
Summary: This study focuses on the influence of yttrium on the crystal structure, hydrogenation properties, and electrochemical behaviors of PuNi3-type La2-xYxMgNi9 alloys. The results show that the addition of yttrium affects the crystal structure and improves the hydrogen storage capacity and electrochemical performance of the alloys, making them promising materials for hydrogen storage and battery electrodes.
DALTON TRANSACTIONS
(2022)
