Article
Metallurgy & Metallurgical Engineering
R. Bakhshi, M. H. Farshidi, S. A. Sajjadi
Summary: The study shows that a superior strengthening effect is achieved through the imposition of severe plastic deformation supplemented by post-deformation natural ageing. The yield strength of the alloy increases to over 400 MPa, which is about one-third higher than the value obtained after the usual T6 treatment. This superior strength is mainly attributed to grain refinement, increased dislocation density, and an increased volume fraction of precipitates during natural ageing.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Multidisciplinary
S. Lay
Summary: Geometrical calculations were used to evaluate the resistance of WC grain boundaries in WC-Co cemented carbides to transfer plastic deformation. It was found that E = 2 and E = 4 grain boundaries are more resistant to dislocation propagation compared to other grain boundaries, which could be controlled to tune the material properties.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
Oleg Sitdikov, Elena Avtokratova, Oksana Latypova, Michael Markushev
Summary: This study compared the structure and mechanical behavior of an Al-5Mg-0.18Mn-0.25c-0.08Zr-0.01Fe-0.01Si alloy under different deformation processes, showing that MIF resulted in ultrafine-grained structure and significantly enhanced strength and ductility after WR and CR. ECAP achieved more profound grain refinement but equal properties with MIF after WR, while CR following ECAP exhibited higher strengthening and slightly better superplastic behavior compared to MIF.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Nanoscience & Nanotechnology
J. -E. Brandenburg, J. Seo, K. Eto, D. A. Molodov, S. Tsurekawa
Summary: The study used nanoindentation to investigate the local mechanical properties near 1010 tilt grain boundaries in magnesium bicrystals with different misorientation angles. It was found that critical shear-stress for the second pop-in differed substantially for grain boundaries with different structures, indicating important mechanical property variations in these boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
O. Sitdikov, E. Avtokratova, M. Markushev
Summary: The study revealed that the grain refinement of Al-Mg-based alloy during multidirectional isothermal forging occurs through continuous dynamic recrystallization controlled by nanosized precipitates, resulting in the formation of (ultra) fine grain structure.
METALS AND MATERIALS INTERNATIONAL
(2021)
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.
Article
Nanoscience & Nanotechnology
Yamato Sasaki, Koji Morita, Takahisa Yamamoto, Kohei Soga, Hiroshi Masuda, Hidehiro Yoshida
Summary: This study systematically investigated the impact of electric direct current on the flow behavior of densified tetragonal ZrO2 polycrystal. An optimal current density was identified for achieving maximum tensile ductility, which was attributed to the acceleration of diffusional mass transport in TZP through Joule heating and applied current effect.
SCRIPTA MATERIALIA
(2021)
Article
Metallurgy & Metallurgical Engineering
V. V. Popov, E. Osinnikov, R. M. Falakhutdinov
Summary: Grain boundaries in ultrafine-grained niobium deformed by high-pressure torsion were studied using Mossbauer emission spectroscopy. It was found that the grain boundaries were in a nonequilibrium state with excess free volume after severe plastic deformation. Annealing altered the state of the grain boundaries, bringing them closer to that of coarse-grained materials.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Article
Materials Science, Multidisciplinary
M. Eftekhari, G. Faraji, M. Bahrami, M. Baniassadi
Summary: HTCEC is introduced as a novel severe plastic deformation technique for producing long and large ultrafine grained tubes with high strength and good ductility. Two passes of HTCEC processing resulted in significant improvements in yield strength, ultimate strength, and microhardness while slightly reducing elongation to failure. Additionally, a more homogeneous microhardness distribution was observed in the two-pass processed tubes.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Xi Shu, Xinyu Liang, Jinglin Liu, Qi Wen, Long Wan
Summary: The severe plastic deformation (SPD)-induced rapid diffusion joining method is used to increase the Al/Fe diffusion rate at short time and low temperature, achieving reliable metallurgical bonding. The local stress and strain caused by SPD results in refined crystal grains and high concentrations of dislocations, facilitating the rapid diffusion of Fe atoms to the Al interface region. The diffusion rate of the interface layer is 103 times faster than the thermal activation diffusion state. The short-term and low-temperature characteristics of this method can be extended to other solid-state welding methods.
Article
Chemistry, Physical
Anna Bodyakova, Maksim Tkachev, Georgy Raab, Rustam Kaibyshev, Andrey N. Belyakov
Summary: The effect of severe plastic deformation through ECAE-Conform and cold rolling on the microstructures of Cu-0.1Cr-0.1Zr alloy was investigated. The results showed that an increase in ECAE-Conform strain improved grain refinement and subsequent cold rolling further led to grain size reduction and strengthening. The fraction of ultrafine grains with a size of 160 nm increased with an increase in the number of ECAE-Conform passes, resulting in a higher yield strength of above 550 MPa.
Article
Materials Science, Multidisciplinary
Yizhong Guo, Jiao Teng, Guo Yang, Ang Li, Yao Deng, Chengpeng Yang, Lihua Wang, Xin Yan, Ze Zhang, Xiaoyan Li, En Ma, Xiaodong Han
Summary: Detailed monitoring of atomic-scale processes is crucial for understanding grain rotation in nanocrystalline metals. In this study, in situ atomic-resolution evidence reveals that the type of grain boundary plays a role in the atomic processes involved in grain rotation in nanocrystalline Pt. General GBs exhibit a combination of dislocation activities and atomic rearrangements, while tilt GBs mostly rely on dislocation activities. GB dislocation climb, glide, and reaction are often associated with Lomer-like dislocation formation and destruction.
Article
Nanoscience & Nanotechnology
Ali Alyani, Mohsen Kazeminezhad
Summary: This study investigated the severe plastic deformation of commercially pure aluminum through Multi-Directional Forging at low and room temperatures. The results showed that aluminum processed at low temperatures had higher hardness values and flow stress, but weaker thermal stability after annealing. Additionally, self-annealing led to a significant decrease in hardness values for low-temperature processed samples.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
W. Xu, Y. C. Xin, B. Zhang, X. Y. Li
Summary: This study successfully addresses the issues of intergranular corrosion and stress corrosion cracking in high Mg-containing Al alloys by fabricating nanostructured Al-5Mg alloy with a high proportion of low angle grain boundaries through dynamic plastic deformation and appropriate annealing. The alloy shows excellent intergranular corrosion resistance and stress corrosion cracking resistance, as well as improved strength and ductility.
Article
Construction & Building Technology
Irina Volokitina, Bayan Sapargaliyeva, Aktolkyn Agabekova, Samal Syrlybekkyzy, Andrey Volokitin, Lazzat Nurshakhanova, Farida Nurbaeva, Alexandr Kolesnikov, Gulzhan Sabyrbayeva, Aizhan Izbassar, Olga Kolesnikova, Yury Liseitsev, Svetlana Vavrenyuk
Summary: This study investigates the evolution of microstructure and mechanical properties of bimetallic aluminum-copper rods during Equal channel angular pressing-drawing (ECAP-drawing). The results show the formation of an ultrafine-grained copper-aluminum composite with a gradient structure through ECAP-drawing. The microhardness of the copper shell increased from 57 to 165, and the hardness of the aluminum rod increased from 25 to 75 HV. Tensile test analysis reveals a 2-fold increase in strength properties while a nearly 2-fold decrease in plastic properties, which still remain suitable for further applications.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Chemistry, Physical
Elena V. Bobruk, Maxim Yu. Murashkin, Ilnar A. Ramazanov, Vil U. Kazykhanov, Ruslan Z. Valiev
Summary: This study aims to achieve superplasticity of ultrafine-grained (UFG) Al 2024 alloy at temperatures lower than traditional commercial Al alloys. Complex tensile tests were conducted at various temperatures and strain rates, and the UFG alloy exhibited superplastic behavior at 240 and 270 degrees C. The UFG alloy also demonstrated higher strength compared to the standard strengthening heat treatment T6.
Article
Materials Science, Multidisciplinary
Andrew K. Hoffman, Yongfeng Zhang, Maalavan Arivu, Li He, Kumar Sridharan, Yaqiao Wu, Rinat K. Islamgaliev, Ruslan Z. Valiev, Haiming Wen
Summary: In nuclear reactor environments, nanocrystalline 304 stainless steel exhibits unique radiation-induced segregation behavior with the enrichment of Cr at grain boundaries. Lattice-based atomic kinetic Monte Carlo simulations reveal the influences of grain size, injected interstitials, and self-ion injection on grain boundary segregation.
Article
Materials Science, Multidisciplinary
Zizheng Song, Ranming Niu, Xiangyuan Cui, Elena V. Bobruk, Maxim Yu. Murashkin, Nariman A. Enikeev, Ji Gu, Min Song, Vijay Bhatia, Simon P. Ringer, Ruslan Z. Valiev, Xiaozhou Liao
Summary: Superplastic deformation of polycrystalline materials is usually achieved by diffusion-assisted grain boundary sliding at high temperatures. Recent research has shown that room-temperature superplasticity can be achieved in ultrafine-grained Al-Zn based alloys, but the underlying mechanism is still unclear. This study utilized in-situ tensile straining, electron microscopy characterization, and atomistic density functional theory simulation to reveal that the superplasticity at room temperature is achieved by grain boundary sliding and grain rotation, facilitated by the continuous diffusion of Zn. The diffusion of Zn atoms from grains to grain boundaries forms a Zn nanolayer, acting as a solid lubricant to lower the energy barrier of grain boundary sliding.
Article
Mechanics
G. V. Klevtsov, L. R. Botvina, N. A. Klevtsova, R. Z. Valiev, I. N. Pigaleva
Summary: Fatigue failure is the most common type of failure in various engineering systems, and its study is crucial for predicting system's service life. The investigation of fatigue failure in new ultrafine-grained nanostructured metal materials is particularly interesting. This study demonstrates the possibility of determining the maximum cycle stress and cycle asymmetry coefficient from the depth of plastic zones beneath the surface of fatigue fractures.
PHYSICAL MESOMECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Gennadiy V. Klevtsov, Ruslan Z. Valiev, Natal'ya A. Klevtsova, Maksim N. Tyurkov, Irina N. Pigaleva, Denis A. Aksenov
Summary: This paper analyzes the fracture kinetics and mechanisms of different ultrafine-grained materials with different crystal lattices in the low-cycle fatigue region. The tests conducted show that the formation of ultrafine-grained structure has an unclear effect on the total number of cycles to failure of the samples. The fatigue crack initiation cycles account for about 20% of the total life of the samples, regardless of the material state and crystal lattice type. The fatigue crack propagation rates of the majority of investigated ultrafine-grained materials are close to or lower than that of the initial coarse-grained materials.
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.
Article
Materials Science, Multidisciplinary
Roman R. Valiev, Alexey V. Panin, Emil I. Usmanov, Yana N. Savina, Ruslan Z. Valiev
Summary: This study demonstrates for the first time the influence of high-pressure torsion (HPT) on microstructural refinement and mechanical strength of Ti-6Al-4V titanium alloy produced by wire-feed electron-beam additive manufacturing. HPT processing results in an ultrafine-grained (UFG) structure and significantly increases the microhardness of the alloy. Microscopic studies reveal that the UFG structure consists predominantly of alpha and beta phases.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Beom Joon Kim, Marina Abramova, Hyoung Seop Kim, Nariman Enikeev, Jung Gi Kim
Summary: In this study, the mechanical properties of high-Mn steel subjected to equal-channel angular pressing (ECAP) were investigated at cryogenic temperatures. The results showed that ECAP led to grain refinement and the formation of nanotwins, resulting in a heterogeneous hierarchical structure. This microstructure greatly enhanced the strength of the steel in a cryogenic environment. The effects of heterogeneity induced by heavy straining of the initially coarse-grained material were also discussed.
Review
Materials Science, Multidisciplinary
Maxim Yu. Murashkin, Nariman A. Enikeev, Xavier Sauvage
Summary: This paper provides an overview of the fundamentals and potential applications of ultrafine-grained Al-based conductors developed with severe plastic deformation (SPD) techniques. By intentionally forming nanoscale features within the ultrafine grains, such as nanoprecipitates and segregation of solutes along crystallographic defects, the mechanical and functional performance of the conductors can be optimized to enhance the combination of strength and electrical conductivity, meeting the demand for advanced lightweight conductors in modern industries.
MATERIALS TRANSACTIONS
(2023)
Article
Chemistry, Physical
Anwar Qasim Ahmed, Daniel Olasz, Elena V. Bobruk, Ruslan Z. Valiev, Nguyen Q. Chinh
Summary: A supersaturated Al-Zn-Mg-Zr alloy with ultrafine-grained structure was obtained through the ECAP technique, resulting in significantly improved hardness and changes in subsequent thermal processes.
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.
Article
Materials Science, Multidisciplinary
Tatiana S. Orlova, Aydar M. Mavlyutov, Dinislam I. Sadykov, Nariman A. Enikeev, Maxim Yu. Murashkin, John D. Clayton
Summary: The influence of additional deformation heat treatments on a ultrafine-grained Al-Mg-Zr alloy was studied. It was found that the treatments greatly enhanced plasticity while maintaining high electrical conductivity and strength. The increase in density of grain boundary dislocations was the main factor contributing to the improved properties.
Article
Materials Science, Biomaterials
Alexander A. Matchin, Evgeniy V. Nosov, Alexander A. Stadnikov, Gennadiy V. Klevtsov, Luiza R. Rezyapova, Natalia A. Sayapina, Elena V. Blinova, Ruslan Z. Valiev
Summary: This study focuses on the osseointegration behavior of medical implants made from nanostructured grade 4 titanium in maxillofacial surgery. The results show that nanotitanium implants have a significantly faster fixation rate due to osseointegration compared to standard factory-made implants, indicating better osseointegration for nanotitanium implants.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Elena Bobruk, Vladimir V. Astanin, Ilnar A. Ramazanov, Nail G. Zaripov, Vil U. Kazykhanov, Nariman A. Enikeev
Summary: Homogeneous nanostructured and ultrafine-grained states were achieved in an Al-Mg-Mn-Zn-Zr alloy through high pressure torsion and continuous equal channel angular pressing. The refined grain structure in both states exhibited low temperature and high strain rate superplastic behavior. The nanostructured alloy was used for MMC fabrication under superplastic conditions, resulting in defect-free compaction of an Al-B fiber-reinforced composite.
MATERIALS TODAY COMMUNICATIONS
(2023)
Review
Engineering, Multidisciplinary
Mikhail V. Kiselevskiy, Natalia Yu. Anisimova, Alexei V. Kapustin, Alexander A. Ryzhkin, Daria N. Kuznetsova, Veronika V. Polyakova, Nariman A. Enikeev
Summary: This paper provides an overview of recent research findings in model-driven development of additively manufactured porous materials for the development of bioactive implants in orthopedic applications. By adjusting pore geometry, it is possible to control the mechanical properties and drug loading capacity of the engineered structures to be compatible with bone tissues. The paper also critically analyzes the recent advances in the field and highlights the actual problems and their potential solutions.
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)
