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
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
Nanoscience & Nanotechnology
Pierre Maurel, Laurent Weiss, Philippe Bocher, Thierry Grosdidier
Summary: SMAT treatment at cryogenic temperature can improve the fatigue resistance of 5553 beta-metastable Ti alloy by generating compressive residual stresses, reducing roughness, deepening martensite formation, and increasing the size of kink bands. Conversely, SMAT treatment at room temperature does not provide any improvement in fatigue performance, possibly due to the appearance of subsurface crystallographic defects caused by the larger grain size.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
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%.
Article
Chemistry, Physical
Payam Edalati, Abbas Mohammadi, Mostafa Ketabchi, Kaveh Edalati
Summary: Dual-phase HEAs have attracted significant attention due to their promising mechanical properties, and experimental investigation on the AlFeCoNiCu alloy reveals diverse microstructural evolution behaviors of the two phases during plastic deformation, leading to a high microhardness of 495 Hv under high-pressure torsion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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
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
Jacqueline Hidalgo-Jimenez, Jorge M. Cubero-Sesin, Kaveh Edalati, Sakine Khajavi, Jacques Huot
Summary: In this study, the activation problem of Laves phase high-entropy alloys in hydrogenation process was successfully solved using high-pressure torsion. The results showed that the HPT-processed samples were able to rapidly absorb hydrogen at room temperature, indicating that HPT processing is an effective strategy for developing active hydrogen storage materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
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)
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
Materials Science, Multidisciplinary
Krzysztof Bryla, Jelena Horky
Summary: Ultra-fine grained and nanostructured magnesium alloys produced by severe plastic deformation methods are promising for orthopaedic implants due to their enhanced mechanical properties, corrosion resistance, and biocompatibility. This paper provides an overview of the impact of two important methods, equal-channel angular pressing (ECAP) and high-pressure torsion (HPT), on microstructure refinement and mechanical property improvement of magnesium alloys for medical implants. The results demonstrate the beneficial effect of severe plastic deformation methods in obtaining ultra-fine and nanostructured magnesium alloys with improved mechanical and functional properties required for bioabsorbable implants.
MATERIALS TRANSACTIONS
(2023)
Article
Nanoscience & Nanotechnology
Qing Tan, Zhiran Yan, Runguang Li, Yang Ren, Yandong Wang, Baptiste Gault, Stoichko Antonov
Summary: This study investigates the deformation behavior of hydrogen-charged commercially pure titanium using in-situ high energy X-ray diffraction. The results reveal that the peak broadening in the diffusion patterns is caused by high internal and interphase stresses generated within and around the hydrides due to volume expansion caused by phase transformation. The hydrides exhibit high strength but brittle secondary phase behavior and sustain larger strains than the matrix. This study provides valuable insights into hydride deformation behavior and hydrogen embrittlement in titanium and zirconium.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Xiangnan Pan, Guian Qian, Youshi Hong
Summary: Nanograin materials spontaneously form during ductile fracture, potentially providing a new approach for designing high ductile materials. The dominating mechanism behind this phenomenon is local severe-plastic-deformation.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Andrea Mizelli-Ojdanic, Jelena Horky, Bernhard Mingler, Mattia Fanetti, Sandra Gardonio, Matjaz Valant, Bartosz Sulkowski, Erhard Schafler, Dmytro Orlov, Michael J. Zehetbauer
Summary: This study analyzed several biodegradable Mg alloys through high-pressure torsion and elevated temperature heat treatments, revealing significant strength increases from various factors including dynamic recovery for improved ductility. The study also showed that the initial values of Young's modulus and corrosion resistance were largely unaffected by the processing routes, indicating a viable method for optimizing Mg alloys for enhanced mechanical properties while maintaining corrosion properties.
Article
Chemistry, Inorganic & Nuclear
Jian Wang, Timothy Steenhaut, Hai-Wen Li, Yaroslav Filinchuk
Summary: A simple, efficient, and environmentally friendly solvothermal method was developed to prepare high-purity Na2B12H12 and K2B12H12, paving the way for large-scale synthesis of M(x)B(12)H(12) derivatives.
INORGANIC CHEMISTRY
(2023)
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
Chemistry, Inorganic & Nuclear
Zhi-Kang Qin, Li-Qing He, Xiao-Li Ding, Ting-Zhi Si, Ping Cui, Hai-Wen Li, Yong-Tao Li
Summary: Building liquid channels in magnesium hydride by introducing lithium borohydride ion conductors improves its low-temperature hydrogen sorption. For example, 5 wt% LiBH4-doped MgH2 can release about 7.1 wt.% H-2 within 40 min at 300 degrees C, while pure MgH2 only desorbs less than 0.7 wt.% H-2. Additionally, the LiBH4-doped MgH2 exhibits faster desorption kinetics with more than 10 times enhancement compared to pure MgH2, and maintains a stable cyclic performance even after six absorption and desorption cycles. This approach provides insights for promoting hydrogen absorption and desorption of other metal hydrides.
Review
Chemistry, Physical
Junrui Zhang, Haiwen Li, Xuezhang Xiao, Liuzhang Ouyang
Summary: Metal borohydrides have high theoretical hydrogen production/storage densities and offer efficient real-time hydrogen supply for electronics. However, their practical applications are limited. Strategies to overcome these limitations, such as optimizing the boron/hydrogen source and reducing agent, are summarized in this review. Ouyang developed a practical and low-cost method for regenerating MBH4 by ball milling, which has the potential to decrease the synthesis cost and increase the reversibility of metal borohydrides.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Materials Science, Multidisciplinary
Xiao Li, Yigang Yan, Torben R. Jensen, Yaroslav Filinchuk, Iurii Dovgaliuk, Dmitry Chernyshov, Liqing He, Yongtao Li, Hai-Wen Li
Summary: Mg(BH4)2 is a high capacity hydrogen storage material with new functions of gas physisorption and ionic conductivity. This review summarizes the recent progress on its energy related functions, including reversible hydrogen storage, gas adsorption, and electrolyte application.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
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
Shunqin Zeng, Xiaoli Ding, Liqing He, Hai-Wen Li, Qingan Zhang, Yongtao Li
Summary: Dual lithium-containing hydride/oxide shells are formed by in situ mechano-induced assembly of Li3PO4 and LiBH4. The ionic conductivity of the Li3PO4-based composite is significantly improved by nearly 4 orders of magnitude, reaching 0.04 mS cm(-2) at 75°C, with an electrochemical window of -0.2-5 V (vs. Li/Li+).
MATERIALS ADVANCES
(2023)
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
Fuhu Yin, Yu Chang, Tingzhi Si, Jing Chen, Hai-Wen Li, Yongtao Li, Qingan Zhang
Summary: In this study, new Zr-based high-entropy alloys with Laves phases were designed, and their structure and hydrogen storage properties were adjusted by introducing Mg element. The results show that the addition of Mg element improves the hydrogen storage capacity and kinetics of these alloys, making them potential candidates for hydrogen storage materials.
Article
Chemistry, Inorganic & Nuclear
Bingjie Ma, Wenbin Jiang, Liuzhang Ouyang, Haiwen Li
Summary: This study suggests using glycine as an electrolyte additive in 3.5 wt% NaCl solution to enhance the discharge performance of commercial AZ31 magnesium alloys at high current densities.
INORGANIC CHEMISTRY FRONTIERS
(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)
