Article
Materials Science, Multidisciplinary
Sebastian Samberger, Irmgard Weissensteiner, Lukas Stemper, Christina Kainz, Peter J. Uggowitzer, Stefan Pogatscher
Summary: This study presents age-hardenable, fine-grained AlMgZnCu crossover alloys intended for superplastic and quick plastic forming processes. These alloys utilize T-phase (Mg32(Al,Zn)49) to refine the grain structure and increase age-hardening. The study demonstrates the importance of particle stimulated nucleation (PSN) using T-phase particles, which leads to a fine grain size as low as 4 μm. The resulting alloys have excellent high-temperature forming properties and high stability.
Article
Materials Science, Multidisciplinary
Feng Wang, Yu-Lung Chiu, Dmitry Eskin, Wenjia Du, Paul R. Shearing
Summary: The study found that the addition of vanadium can cause grain refinement of cast commercial purity aluminium, mainly due to the high nucleation potency and sufficient growth restriction effect of Al10V particles. In addition, the relatively large size of Al10V particles helps to promote the nucleation of aluminium grains.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Manufacturing
Qiyang Tan, Yu Yin, Arvind Prasad, Gan Li, Qiang Zhu, David Henry StJohn, Ming-Xing Zhang
Summary: Grain refinement is essential for improving mechanical properties in additively manufactured alloys, and the role of solute in promoting heterogeneous nucleation needs to be considered.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Takahiro Masuda, Kazushige Fujimitsu, Kosei Sumikawa, Takahiro Kajita, Yongpeng Tang, Shoichi Hirosawa, Yoichi Takizawa, Manabu Yumoto, Yoshiharu Otagiri, Zenji Horita
Summary: This study investigates the strain distribution in the high-pressure sliding processing for rods of pure Al and an AZ61 alloy, revealing the preferential introduction of strain in an oblique direction and suggesting solutions for improving the homogeneous strain distribution.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Weijiang Liu, Jian Li, Xin Chen, Minghua Ji, Xiangpeng Xiao, Hang Wang, Bin Yang
Summary: The study showed that increasing V content in Cu-3.2Ti-0.2Fe-xV alloys led to a higher volume fraction of Laves_C14, which effectively refined grain size during casting and inhibited grain growth during solution treatment. The activation energies of the alloys varied with V content, while discontinuous precipitation was influenced by grain boundary diffusion.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Xu Yang, Bingxing Wang, Wei Jiang, Shu-nan Chen, Jun Wang
Summary: Cold rolling with 84% reduction, followed by two-stage annealing, was effective in refining and homogenizing the grains of Inconel 718, leading to improved superplasticity. The introduction of crystal defects and storage energy during plastic deformation contributed to a dense and fine distribution of delta phase, enhancing the driving force for static recrystallization.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Qiyang Tan, Zhiqi Fan, Xiaoqin Tang, Yu Yin, Gan Li, Danni Huang, Jingqi Zhang, Yingang Liu, Feng Wang, Tao Wu, Xianliang Yang, Han Huang, Qiang Zhu, Ming-Xing Zhang
Summary: The study proposed a novel strategy combining substrate modification and inoculation treatment to successfully fabricate crack-free and dense high-strength 7075 alloy using SLM. This strategy can be implemented for SLM of other engineering alloys, providing a foundation for broadening industrial applications of SLM.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Ahmed O. Mosleh, Olga A. Yakovtseva, Anna A. Kishchik, Anton D. Kotov, Essam B. Moustafa, Anastasia V. Mikhaylovskaya
Summary: Friction stir processing (FSP) is a promising technique for refining grains and improving mechanical properties. This study compared an FSP-ed Al-Mg-Sc-Zr alloy with fine nanoscale Al-3(Sc,Zr) precipitates and an alloy modified with both Al-3(Sc,Zr) and coarse Al9FeNi-phase particles. The results showed that both secondary-phase particles and FSP parameters influenced the microstructure, mechanical properties, and superplasticity of the alloys. The modified alloy exhibited an improvement in ultimate tensile strength and elongation-to-fracture compared to the reference alloy, thanks to the effective grain refinement provided by the fine Al-3(Sc,Zr) and coarse Al9FeNi particles.
Review
Engineering, Civil
Reza Motallebi, Zeinab Savaedi, Hamed Mirzadeh
Summary: High-entropy alloys (HEAs) are a new class of engineering materials with unique mechanical and functional properties. Superplastic forming of HEAs might be a viable route for actual applications of these alloys. This monograph summarized the superplastic behaviors of HEAs and medium-entropy alloys (MEAs), along with reviewing the basics of high-entropy alloys and fine-grained superplasticity.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Guniputi Bala Narasimha, S. M. Murigendrappa
Summary: This study investigates the effect of cerium and aluminium on Cu-Al-Be shape memory alloys. Increasing cerium reduces grain size, increases transformation temperatures, and decreases shape recovery ratio, with the alloy containing 0.1wt% cerium exhibiting the highest tensile strength and ductility.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Xiaofen Tan, Matthew Weyland, Yu Chen, Timothy Williams, Philip N. H. Nakashima, Laure Bourgeois
Summary: This study investigates voids coated with a monolayer of tin in aluminum alloys, finding that tubular voids can grow to hundreds of nanometers in length under certain heat treatment conditions with high coherence with the Al matrix. The aspect ratios of tubular voids show a strong correlation with the coherence between the tin particle and the arrangement of the tin atoms in the void coating, suggesting potential for future research and applications.
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
Materials Science, Multidisciplinary
Katarzyna Stan-Glowinska, Amelia Zieba, Lukasz Rogal
Summary: This study investigates the microstructures and mechanical properties of two conventionally cast Al-Mg-Zn base alloys during aging process. The results show that the Ga-bearing alloy exhibits higher hardness and tensile strength, which can be attributed to its higher precipitate number density. In addition, the structure of formed precipitates differs between the two alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Review
Materials Science, Multidisciplinary
Zeinab Savaedi, Reza Motallebi, Hamed Mirzadeh, Rouhollah Mehdinavaz Aghdam, Reza Mahmudi
Summary: This overview article reviews the superplastic behavior of medical magnesium alloys. It discusses the basics of superplasticity and superplastic forming via grain boundary sliding (GBS). The properties of biomedical Mg alloys are tabulated. The critical discussion focuses on the superplasticity of biocompatible Mg-Al, Mg-Zn, Mg-Li, and Mg-RE alloys, emphasizing the influence of grain size, hot deformation temperature, and strain rate on tensile ductility.
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Alok Singh, Takanobu Hiroto, Hiroyuki Watanabe, Naoko Ikeo, Toshiji Mukai, Koichi Tsuchiya
Summary: Addition of Al to equiatomic high entropy alloy promotes formation of BCC phase and sigma phase. Straining by caliber rolling induces morphological changes related to planar faults, where sigma phase nucleates first on the matrix faults followed by formation of B2 phase driven by elemental concentration changes. This study provides insights into the formation mechanisms of different phases in the alloy.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
O. V. Rofman, A. S. Prosviryakov, A. D. Kotov, A. I. Bazlov, P. O. Milovich, Gopalu Karunakaran, A. V. Mikhaylovskaya
Summary: In this research, high-energy ball milling was used to disperse various volume fractions of sub-micron-sized SiCp particles in AA2024 aluminum powder alloy, focusing on powder morphology and milling conditions. Changes in lattice parameters of the matrix alloy were observed after mechanical alloying. Compression testing at elevated temperatures showed sufficient ductility for thermomechanical processing.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
A. Mikhaylovskaya, O. A. Yakovtseva, A. Irzhak
Summary: The superplastic forming technique is used for producing complex shaped lightweight constructions by achieving extremely high plastic deformation mainly through grain boundary sliding. Studies have shown that fine-grained commercial Al-Mg based alloys exhibit unusually weak grain boundary sliding and increased contributions of accommodation mechanisms during the initial stage of superplastic deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
M. Esmaeili Ghayoumabadi, A. G. Mochugovskiy, N. Yu Tabachkova, A. Mikhaylovskaya
Summary: This study aimed to improve the superplastic formability of Alloy AA6013 by refining its grain structure and controlling grain growth at elevated temperatures. Minor additions of Y, Sc, and Zr were considered. The results showed that the additions led to a noticeable refinement of the grain structure and the formation of dispersed particles. These effects inhibited recrystallization and dynamic grain growth, resulting in grain refinement and achieving superplasticity in the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
A. D. Kotov, A. G. Mochugovskiy, A. O. Mosleh, A. A. Kishchik, O. V. Rofman, A. V. Mikhaylovskaya
Summary: Minor additions of rare-earth elements have been found to enhance the mechanical properties of aluminum-based alloys by improving precipitation strengthening and increasing resistance to recrystallization. This study investigated the microstructure, mechanical properties, and superplasticity of Al-Mg-Z-Er alloys with varying Mg content. The results showed that an increase in Mg content led to solid solution strengthening and facilitated dynamic recrystallization at high temperatures. The presence of fine L12 precipitates and (Al,Mg)3Er particles resulted in a fine-grained structure and excellent superplastic deformation behavior.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
A. G. Mochugovskiy, A. B. Mukhamejanova, A. D. Kotov, O. A. Yakovtseva, N. Yu Tabachkova, A. Mikhaylovskaya
Summary: The study reveals that pre-straining significantly accelerates the precipitation kinetics of Al-Mn-Mg alloy, increases the number density of quasicrystalline-structured precipitates, and induces a hardening effect after annealing.
Article
Nanoscience & Nanotechnology
Anton D. Kotov, Maria N. Postnikova, Ahmed O. Mosleh, Anastasia Mikhaylovskaya
Summary: This study investigated the effect of Fe content on the microstructure, superplasticity, and post-forming mechanical properties of Ti-Al-Mo-V alloy. The results showed that increasing Fe content promoted recrystallization and fragmentation, leading to accelerated diffusivity. The alloys exhibited high strain rate sensitivity and maximum elongation to failure at a constant strain rate and low temperature. Alloying with Fe increased the post-forming room-temperature tensile strength and decreased ductility. Alloying with 0.5% Fe provided a good combination of superplastic and room-temperature mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Andrey G. Mochugovskiy, Alexey S. Prosviryakov, Nataliya Yu Tabachkova, Anastasia Mikhaylovskaya
Summary: The current study focuses on the influence of Ce on the superplastic behavior, microstructure, and mechanical properties of the Al-Mg-Si-Cu-Zr-Sc alloy. Through thermomechanical treatment and annealing methods, nanoscale dispersoids were formed to improve the alloy's superplastic properties.
Article
Materials Science, Multidisciplinary
Anton D. Kotov, Maria N. Postnikova, Ahmed O. Mosleh, Vladimir V. Cheverikin, Anastasia Mikhaylovskaya
Summary: The paper investigates the effect of 0.5-1.8 wt.% Ni alloying on the superplasticity, microstructural evolution, and dynamic grain growth of two-phase Ti-Al-Mo-V alloys. The results show that an increase in Ni content significantly improves superplasticity, but excessive Ni content leads to a decrease in superplastic properties. The Ti-4Al-3Mo-1V-0.1B alloy with 0.9 wt.% Ni exhibits a good combination of superplastic behavior and room-temperature mechanical properties.
Article
Chemistry, Physical
Olga A. Yakovtseva, Andrey I. Bazlov, Alexey S. Prosviryakov, Nadezhda B. Emelina, Natalia Yu. Tabachkova, Anastasia V. Mikhaylovskaya
Summary: The microstructure, phase composition, and hardness evolutions of high-energy ball milled Al-15.3%Mn-6.2%Cu alloy and alloy matrix composites with 2% and 5% Al2O3 fine particles were investigated. The milling process dissolved the non-equilibrium phase CuAl2 and equilibrium phase Al20Cu2Mn3, resulting in a decrease in the lattice parameter and microhardness of aluminum. Further milling time and annealing of pre-milled samples led to the decomposition of the solid solution and precipitation of the Mn-enriched phase. The addition of Al2O3 particles refined the particles, increased the microhardness, and promoted the dissolution of phases and precipitation of the Mn-enriched phase, improving the precipitation hardening effect.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Ahmed O. Mosleh, Olga A. Yakovtseva, Anna A. Kishchik, Anton D. Kotov, Essam B. Moustafa, Anastasia V. Mikhaylovskaya
Summary: Friction stir processing (FSP) is a promising technique for refining grains and improving mechanical properties. This study compared an FSP-ed Al-Mg-Sc-Zr alloy with fine nanoscale Al-3(Sc,Zr) precipitates and an alloy modified with both Al-3(Sc,Zr) and coarse Al9FeNi-phase particles. The results showed that both secondary-phase particles and FSP parameters influenced the microstructure, mechanical properties, and superplasticity of the alloys. The modified alloy exhibited an improvement in ultimate tensile strength and elongation-to-fracture compared to the reference alloy, thanks to the effective grain refinement provided by the fine Al-3(Sc,Zr) and coarse Al9FeNi particles.
Article
Nanoscience & Nanotechnology
Anton D. Kotov, Maria N. Postnikova, Ahmed O. Mosleh, Anastasia V. Mikhaylovskaya
Summary: The superplastic deformation behavior, strain-induced microstructure evolution, and post-deformation mechanical properties of Ti-4Al-1V-1Fe-1Ni-0.1B-xMo alloys (x = 1, 2.5, or 5 wt%) were investigated. It was found that 5% Mo content significantly improved the β-phase fraction, m-value, δ-value at low temperature (625°C), as well as the post-forming tensile mechanical properties at room temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
V. V. Palacheva, M. Yu. Zadorozhnyy, A. V. Mikhaylovskaya, P. A. Petrov, I. S. Golovin
Summary: Structural-induced anelasticity in AA5051 alloy was analyzed under two different treatment schemes: simple compression and compression combined with torsion. Anelasticity caused by structural transitions was studied using temperature, time, and amplitude-dependent tests. The sample subjected to compression combined with torsion exhibited a higher thermodynamical stimulus for recrystallization and higher dislocation density, resulting in a faster decrease in dislocation density during instant heating and isothermal annealing. The Avrami kinetics parameters for isothermal recrystallization and activation parameters for grain boundary relaxation after recrystallization were calculated.
Article
Metallurgy & Metallurgical Engineering
A. A. Kishchik, S. A. Aksenov, M. S. Kishchik, D. O. Demin, A. Yu. Churyumov, A. V. Mikhaylovskaya
Summary: The effects of isothermal multidirectional forging (IMF) on the grain structure, second-phase particles of solidification origin, and dispersoids in the Al-4.9Mg-0.9Ni-0.9Fe-0.2Zr-0.1Sc alloy were investigated. The results showed that the strain distribution during forging has a significant influence on the alloy properties. A new method for constructing stress-strain curves was proposed to accurately characterize the mechanical behavior of the material. Additionally, increasing the number of phase cycles resulted in a reduction in the size of solidification-origin phase particles and a finer grain structure.
PHYSICS OF METALS AND METALLOGRAPHY
(2023)
Article
Metallurgy & Metallurgical Engineering
A. Mikhaylovskaya, A. A. Kishchik, N. Yu Tabachkova, A. S. Prosviryakov, A. G. Mochugovskiy
Summary: This study investigates the parameters of the precipitated dispersoids in the Al-4.9Mg-1.2Mn alloy during low-temperature and high-temperature homogenization annealing, and examines the effect of homogenization treatment on grain structure and mechanical properties.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Article
Metallurgy & Metallurgical Engineering
A. G. Mochugovskiy, R. Yu Barkov, A. Mikhaylovskaya, I. S. Loginova, O. A. Yakovtseva, A. Pozdniakov
Summary: The structure and properties of Al-4.5Mg-0.15Zr compositions additionally alloyed with Er, Y, and Yb were investigated. It was found that during low-temperature annealing, precipitates with a size of 3-5 nm and L1(2) structure were formed. The recrystallization of cold-rolled sheets of the alloys began at around 300 degrees C, resulting in a substantial decrease in hardness and almost complete recrystallization of the structure. Heating up to 550 degrees C resulted in a stable recrystallized structure with a grain size of 11-13 μm for the alloys with Er and Yb, while the alloy with Y formed a coarse-grained structure with an average grain size of 40 +/- 7 μm.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
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)
