Article
Chemistry, Physical
Payam Edalati, Abbas Mohammadi, Mostafa Ketabchi, Kaveh Edalati
Summary: This study combines multiple strategies to achieve ultrahigh hardness in metallic alloys, including solution hardening, grain refinement, and introducing dual phases. The resulting high hardness is attributed to the formation of nanograins and the generation of dislocations, interfaces, and spinodal-like elemental decomposition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Abbas Mohammadi, Payam Edalati, Makoto Arita, Jae Wung Bae, Hyoung Seop Kim, Kaveh Edalati
Summary: In this study, various kinds of defects were introduced into a CrMnFeCoNi Cantor alloy by plastic straining, and the correlations of applied strain, microstructural features, strength, and hydrogen embrittlement were investigated. It was found that introducing twins and defects with low mobility can enhance the yield strength and improve the hydrogen embrittlement resistance of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Abbas Mohammadi, Payam Edalati, Makoto Arita, Jae Wung Bae, Hyoung Seop Kim, Kaveh Edalati
Summary: In this study, three strategies are combined to achieve excellent strength-plasticity combinations in the presence of hydrogen embrittlement phenomena. First, an FCC high-entropy alloy with slow hydrogen lattice diffusion is selected. Second, aluminum is added to hinder surface-to-bulk hydrogen diffusion. Third, low-mobility lattice defects like nanotwins and Lomer-Cottrell locks are introduced by severe plastic deformation to suppress hydrogen-enhanced localized plasticity and stress concentration. The Al0.1CrFeCoNi alloy severely deformed by high-pressure torsion exhibits an ultrahigh yield strength of 1.96 GPa and a high elongation to failure of 10%.
Review
Materials Science, Multidisciplinary
Parisa Edalati, Masayoshi Fuji, Kaveh Edalati
Summary: This article reviews the recent advances in the application of severe plastic deformation to developing superfunctional high-entropy materials, highlighting their superior properties for various mechanical and functional applications.
Review
Materials Science, Multidisciplinary
Parisa Edalati, Masayoshi Fuji, Kaveh Edalati
Summary: High-entropy alloys and ceramics with multiple principal elements have gained attention recently for their mechanical and functional applications. Severe plastic deformation (SPD), combined with calculation of phase diagram (CALPHAD) and first-principles calculations, has led to the development of superfunctional high-entropy materials with superior properties compared to conventional engineering materials. This article reviews the recent advances in using SPD to create these materials.
Article
Nanoscience & Nanotechnology
Jeimmy Gonzalez-Masis, Jorge M. Cubero-Sesin, Alexander Campos-Quiros, Kaveh Edalati
Summary: In this study, biocompatible nanostructured high-entropy alloys were successfully synthesized using the high-pressure torsion method. The research compared the characteristics of different alloys and found that as the number of principal elements increased, hardness increased and grain size decreased, but these variations became less significant with further increase in configurational entropy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Martin Fibela-Esparza, Armando Salinas-Rodriguez, Juan Mendez-Nonell, Jose Martin Herrera-Ramirez, Yoshikazu Todaka, Jose Gerardo Cabanas-Moreno
Summary: A Mg-based composite material was produced by high-pressure torsion (HPT) consolidation. Differences were observed in density and microhardness measurements between the center and the periphery. Surface contamination of the Mg powders did not prevent full consolidation of the material.
Article
Nanoscience & Nanotechnology
S. Kiranbabu, Y. Qin, L. Sreekala, R. Pippan, L. Morsdorf, M. Herbig
Summary: The X30CrMoN15-1 high-nitrogen bearing steel exhibits superior resistance against rolling contact fatigue failures compared to the conventional 100Cr6 bearing steel. Through multi-scale characterization techniques, it is found that the stability of carbonitride precipitates largely contributes to the better performance of the steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Review
Materials Science, Multidisciplinary
Kaveh Edalati, Hai-Wen Li, Askar Kilmametov, Ricardo Floriano, Christine Borchers
Summary: High-pressure torsion (HPT) is commonly used as a severe plastic deformation method to produce ultrafine-grained metals and as a mechanical alloying technique for synthesizing different alloys, including high-entropy alloys. HPT has also been applied to synthesize high-entropy materials, such as metallic alloys, hydrides, oxides, and oxynitrides, to enhance their mechanical and hydrogen storage properties, photocatalytic hydrogen production, and light absorbance.
Article
Materials Science, Multidisciplinary
Takahiro Kunimine, Yohei Tomaru, Minami Watanabe, Ryoichi Monzen
Summary: The tensile deformation behavior of high-strength nanostructured Cu-Si solid-solution alloys processed by high-pressure torsion was studied at room and low temperatures. Increasing Si concentration led to significantly increased tensile strength. This strengthening effect was achieved through grain refinement and increased dislocation density caused by severe plastic deformation with the influence of Si addition on the decreasing stacking fault energy of the Cu-Si alloy.
MATERIALS TRANSACTIONS
(2021)
Article
Chemistry, Physical
Dmitriy Y. Rasposienko, Larisa I. Kaigorodova, Vladimir G. Pushin, Yurii M. Ustugov
Summary: This article provides an overview of modern material science problems in ultralightweight high-modulus commercial Al-Li-based alloys, highlighting successful innovations in the Soviet and Russian aviation industry. The key regularities of multicomponent alloying are discussed, along with the microstructures, phase composition, and properties formed during aging. The main mechanisms of phase formation are generalized, and recent achievements in designing unique structural and phase transformations through severe plastic deformations and heat treatment are presented.
Article
Chemistry, Physical
Alexey E. Svirid, Vladimir G. Pushin, Natalia N. Kuranova, Vladimir V. Makarov, Yuri M. Ustyugov
Summary: By using electron microscopy and X-ray analysis techniques, combined with measurements of electrical resistance and magnetic susceptibility, the authors have obtained data on the unique characteristics of pre-martensitic states and martensitic transformations, as well as subsequent decomposition in Cu-14wt%Al-3wt%Ni and Cu-13.5wt%Al-3.5wt%Ni shape memory effect alloys. The microstructure, phase composition, mechanical properties, and microhardness of nanocrystalline alloys produced by severe plastic deformation and subsequent annealing have been determined for the first time. A crystallographic model of martensite nucleation and rearrangements beta(1)->beta(1)' and beta(1)->gamma(1)' has been proposed based on analysis of observed tweed contrast and diffuse scattering in the austenite, as well as internal defects in the martensite substructure.
Article
Chemistry, Physical
M. Osorio-Garcia, K. Suarez-Alcantara, Y. Todaka, A. Tejeda-Ochoa, M. Herrera-Ramirez, O. Hernandez-Silva, F. Cruz-Gandarilla, J. G. Cabanas-Moreno
Summary: Bulk materials of the Mg-Ni-Nb2O5 alloy with ultrafine grain structure produced by high-pressure torsion (HPT) processing exhibit faster hydrogenation kinetics and higher storage capacities compared to initial mild-milled powder mixtures. However, the storage capacities are limited by the formation of MgO after several hydrogenation cycles. Despite this limitation, the material can be handled and stored without special precautions and maintains its fast activation in posterior hydrogenation treatments for several months.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Mingze Wang, Zhiqin Wen, Linsen Liang, Weiming Chen, Huaxuan Mo, Gaoxiang Wei, Yuhong Zhao
Summary: This study compares the influences of 12% Ti, V, and Ti+V on the structure and mechanical properties of AlCrFeNi matrix. Mixing Ti and V leads to additional strengthening through new precipitating phases, while Ti is more effective than V in enhancing grain boundary energy. V causes solid solution strengthening but does not benefit grain boundary strengthening. The combination of Ti and V enhances the coordination strengthening. The AlCrFeNi alloy with 88% Ti, 6% V, and 6% Ti+V exhibits excellent compressive yield strength and strain.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Akshay Kumar, Alok Singh, Amit Suhane
Summary: High entropy alloys (HEAs) were first reported in 2004, but significant progress in this field has been made since 2010 due to their unique properties and the ability to form various compositions. Researchers initially focused on equiatomic HEAs and later shifted to non-equiatomic alloys. Mechanical alloying and sintering were identified as effective methods for processing HEAs. This review discusses the properties, functional properties, and applications of mechanically alloyed HEAs, as well as the existing challenges and opportunities.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Fatemeh Alijani, Mohsen Reihanian, Khalil Gheisari, Kaveh Edalati, Hiroyuki Miyamoto
Summary: The effect of homogenization on the microstructure and hardness of FeCoNiMn high entropy alloy during high-pressure torsion was investigated. The results showed that homogenization could lead to a reduction in grain size and an increase in hardness.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Nanoscience & Nanotechnology
Roberto B. Figueiredo, Kaveh Edalati, Terence G. Langdon
Summary: This study evaluates the contribution of thermally-activated creep mechanisms to the flow stress of nanomaterials processed by high-pressure torsion, and provides an explanation for the strain softening phenomenon in metals with low melting temperatures. The results confirm the significance of thermally-activated phenomena in determining the flow stress of nanomaterials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Haruka Shimizu, Motohiro Yuasa, Hiroyuki Miyamoto, Kaveh Edalati
Summary: The influence of nanocrystalline structure produced by severe plastic deformation on the corrosion behavior of CoCrFeMnNi alloys was investigated. It was found that the impact of nanocrystalline structure on corrosion behavior was negligible.
Review
Materials Science, Multidisciplinary
Kaveh Edalati, Andrea Bachmaier, Victor A. Beloshenko, Yan Beygelzimer, Vladimir D. Blank, Walter J. Botta, Krzysztof Bryla, Jakub Cizek, Sergiy Divinski, Nariman A. Enikeev, Yuri Estrin, Ghader Faraji, Roberto B. Figueiredo, Masayoshi Fuji, Tadahiko Furuta, Thierry Grosdidier, Jeno Gubicza, Anton Hohenwarter, Zenji Horita, Jacques Huot, Yoshifumi Ikoma, Milos Janecek, Megumi Kawasaki, Petr Kral, Shigeru Kuramoto, Terence G. Langdon, Daniel R. Leiva, Valery Levitas, Andrey Mazilkin, Masaki Mito, Hiroyuki Miyamoto, Terukazu Nishizaki, Reinhard Pippan, Vladimir V. Popov, Elena N. Popova, Gencaga Purcek, Oliver Renk, Adam Revesz, Xavier Sauvage, Vaclav Sklenicka, Werner Skrotzki, Boris B. Straumal, Satyam Suwas, Laszlo S. Toth, Nobuhiro Tsuji, Ruslan Z. Valiev, Gerhard Wilde, Michael J. Zehetbauer, Xinkun Zhu
Summary: This article comprehensively reviews recent advances in the development of ultrafine-grained and nanostructured materials through severe plastic deformation and provides a brief history of this field. Severe plastic deformation methods have been effective in producing materials with advanced mechanical and functional properties, and the field of NanoSPD has experienced significant progress in the past two decades.
MATERIALS RESEARCH LETTERS
(2022)
Article
Chemistry, Physical
Saeid Akrami, Yasushi Murakami, Monotori Watanabe, Tatsumi Ishihara, Makoto Arita, Masayoshi Fuji, Kaveh Edalati
Summary: High-entropy oxides (HEOs) with inherent defective and strained structure exhibit promising photocatalytic activity for CO2 conversion without the need for additional co-catalysts. The unique structural characteristics of HEOs contribute to their high potential as a new family of photocatalysts for CO2 conversion, surpassing conventional photocatalysts in terms of activity and performance.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Gaspar Andrade, Guilherme Zepon, Kaveh Edalati, Abbas Mohammadi, Zhongliang Ma, Hai-Wen Li, Ricardo Floriano
Summary: The crystal structure and hydrogen storage properties of a new equiatomic TiZrNbCrFeNi high-entropy alloy (HEA) were investigated. The alloy exhibited an AB-type configuration, selected through thermodynamic calculations and showed the ability to absorb 1.5 wt% of hydrogen at room temperature without activation. Cyclical testing revealed changes in the fractions of two C14 Laves phases, with one phase having higher reactivity towards hydrogen. The alloy exhibited a single C14 Laves phase after dehydrogenation at 473 K, and microstructural analysis showed excellent homogeneity and element distribution.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Chemistry, Physical
Saeid Akrami, Tatsumi Ishihara, Masayoshi Fuji, Kaveh Edalati
Summary: Excessive CO2 emission from fossil fuel usage has led to global warming and environmental crises. The photocatalytic conversion of CO2 to CO or useful components is a new strategy to address this issue. The main challenge is finding photocatalysts with high efficiency for CO2 photoreduction. Severe plastic deformation (SPD) has been used to develop active catalysts for CO2 conversion. These strategies can enhance photocatalytic efficiency by improving CO2 adsorption, increasing light absorbance, aligning the band structure, and providing active sites for photocatalytic reactions. This article reviews recent progress in using SPD to develop functional ceramics for photocatalytic CO2 conversion.
Review
Chemistry, Physical
Kaveh Edalati
Summary: Superfunctional materials refer to materials with specific properties that surpass those of engineering materials. Severe plastic deformation (SPD) has been widely studied as an effective means to enhance the functional and mechanical properties of metallic and non-metallic materials. Recently, the concept of ultra-SPD, which introduces shear strains exceeding 1000 to reduce the thickness of sheared phases to atomic distances, has been utilized to synthesize novel superfunctional materials. This article discusses the application of ultra-SPD in controlling atomic diffusion, phase transformation, and the synthesis of materials with superfunctional properties.
Article
Materials Science, Multidisciplinary
Abbas Mohammadi, Payam Edalati, Makoto Arita, Jae Wung Bae, Hyoung Seop Kim, Kaveh Edalati
Summary: In this study, three strategies are combined to achieve excellent strength-plasticity combinations in the presence of hydrogen embrittlement phenomena. First, an FCC high-entropy alloy with slow hydrogen lattice diffusion is selected. Second, aluminum is added to hinder surface-to-bulk hydrogen diffusion. Third, low-mobility lattice defects like nanotwins and Lomer-Cottrell locks are introduced by severe plastic deformation to suppress hydrogen-enhanced localized plasticity and stress concentration. The Al0.1CrFeCoNi alloy severely deformed by high-pressure torsion exhibits an ultrahigh yield strength of 1.96 GPa and a high elongation to failure of 10%.
Review
Materials Science, Multidisciplinary
Kaveh Edalati, Etsuo Akiba, Walter J. Botta, Yuri Estrin, Ricardo Floriano, Daniel Fruchart, Thierry Grosdidier, Zenji Horita, Jacques Huot, Hai-Wen Li, Huai-Jun Lin, Adam Revesz, Michael J. Zehetbauer
Summary: Magnesium and its alloys are extensively studied for solid-state hydrogen storage, but there are challenges in the kinetics and thermodynamics of hydrogenation and dehydrogenation. Severe plastic deformation methods have been utilized to improve the activation, air resistance, and kinetics of Mg-based hydrogen storage materials by introducing ultrafine/nanoscale grains and crystal lattice defects. These deformed materials, particularly with alloying additives or second-phase nanoparticles, exhibit fast hydrogen absorption/desorption kinetics and good cycling stability. The study also highlights the application of severe plastic deformation methods in hydrogen binding-energy engineering and the synthesis of new magnesium alloys for reversible low/room-temperature hydrogen storage.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Crystallography
Shivam Dangwal, Kaveh Edalati, Ruslan Z. Z. Valiev, Terence G. G. Langdon
Summary: Strengthening and softening mechanisms in ultrafine-grained materials have been debated for many years. This study examines the Hall-Petch relationship in ultrafine-grained magnesium, aluminum, copper, and iron. The results show that while the materials follow the Hall-Petch relationship initially, an up-break occurs for grain sizes below 500-1000 nm. This is due to enhanced dislocation contribution. However, a down-break occurs for grain sizes smaller than 70-150 nm due to diminished dislocation contribution and increased thermally-activated phenomena. The study also finds that strategies other than grain refinement, such as microstructural stabilization by segregation or precipitation, are necessary to achieve extra strengthening.
Review
Materials Science, Multidisciplinary
Parisa Edalati, Masayoshi Fuji, Kaveh Edalati
Summary: This article reviews the recent advances in the application of severe plastic deformation to developing superfunctional high-entropy materials, highlighting their superior properties for various mechanical and functional applications.
Article
Materials Science, Multidisciplinary
Alina Y. Morkina, Rita I. Babicheva, Elena A. Korznikova, Nariman A. Enikeev, Kaveh Edalati, Sergey V. Dmitriev
Summary: Molecular dynamics simulations were used to study the mechanical dissolution of Zr in Al. The orientation of the grain boundary was found to affect the mixing efficiency of alloy components, with a normal orientation promoting better dissolution of Zr.
Review
Engineering, Chemical
Saeid Akrami, Parisa Edalati, Masayoshi Fuji, Kaveh Edalati
Summary: Nowadays, the environmental crisis caused by fossil fuels and CO2 emissions is a widespread concern. Photocatalysis is a promising clean technology for producing hydrogen fuel, converting harmful components, and degrading pollutants. However, the low efficiency of photocatalysis remains a significant drawback. Recent studies have shown that high-pressure torsion (HPT) can effectively improve the activity of conventional photocatalysts and synthesize highly efficient ones by increasing light absorbance, narrowing the bandgap, aligning the band structure, and decreasing electron-hole recombination through introducing lattice strain, vacancies, high-pressure phases, heterojunctions, and high-entropy ceramics. This review discusses the recent findings on improving photocatalyst efficiency through HPT processing and the parameters that contribute to these improvements.
KONA POWDER AND PARTICLE JOURNAL
(2023)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
