Article
Engineering, Industrial
Xu Yang, Shu-nan Chen, Bingxing Wang, Xiaolin Li, Bin Wang, Yong Tian
Summary: Cold-rolled Inconel 718 exhibited excellent superplasticity at high temperature and high strain rate, due to the rapid atomic diffusion caused by dislocations and the grain refinement induced by cold rolling. The dislocations and recrystallization process have a significant impact on the material's tensile properties.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Hariharan Sriram, Semanti Mukhopadhyay, Kamalnath Kadirvel, Rongpei Shi, Michael J. Mills, Yunzhi Wang
Summary: We investigated the mechanisms of heterogeneous nucleation of γ'' precipitates on pre-existing γ' precipitates in Inconel 718-based alloys using phase field simulations and statistical analysis. The size of γ' precipitates, interfacial energies between γ, γ' and γ'' phases, and the solute depletion zone around growing γ' precipitates were found to determine the choice between the formation of compact and sandwich-like coprecipitates.
Article
Nanoscience & Nanotechnology
Jie Ding, S. Xue, Z. Shang, Jin Li, Y. Zhang, R. Su, T. Niu, H. Wang, X. Zhang
Summary: IN718 superalloy's mechanical properties are largely determined by precipitates, with the precipitation of high-density hexagonal eta phase observed in nanograined IN718 alloy after heat treatment. Compressive stress from severe plastic deformation may inhibit the formation of certain phases while accelerating the precipitation of others, affecting the overall mechanical behavior of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Rong Ran, Yang Wang, Yuan-xiang Zhang, Feng Fang, Yu-kun Xia, Wei-na Zhang, Guo Yuan, Guo-dong Wang
Summary: A novel processing route involving twin-roll casting and two-stage cold rolling was proposed to manufacture Inconel 718 alloy. The element segregation and growth of Laves phase were effectively suppressed due to the sub-rapid solidification rate of the as-cast strip. The dissolution of Laves phases during subsequent homogenization was accelerated because of their refined size. The non-uniform microstructure caused by coarse grains from homogenization treatment can be eliminated by two-stage cold rolling method. The final products exhibited excellent combination of strength and elongation after double aging treatment.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Civil
Tao Zhang, Huigui Li, Hai Gong, Yunxin Wu, Abdulrahaman Shuaibu Ahmad, Xin Chen, Xiaoyong Zhang
Summary: This study investigates the influence of cold and warm rolling on the hardness, microstructure, and tensile properties of WAAM-deposited Inconel 718. The results show that the rolling process leads to grain refinement and changes in grain orientation, which improve the material's performance. Warm-rolled samples exhibit superior tensile properties and isotropic behavior compared to wrought material.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Kaiqiang Wu, Sin Wei Chee, Wen Sun, Adrian Wei-Yee Tan, Sung Chyn Tan, Erjia Liu, Wei Zhou
Summary: Inconel 713C, commonly known for its poor weldability, was successfully deposited on Inconel 718 substrate using a high-pressure cold spray system in this study. The cold-sprayed coating exhibited low porosity and refined grain structures, with significantly higher microhardness compared to the substrate. Wear tests revealed that the cold-sprayed Inconel 713C coating had three times higher wear resistance than Inconel 718 substrate, showcasing its potential as a protective layer against wear mechanisms such as oxidation, tribo-film formation, and adhesive wear.
Article
Materials Science, Multidisciplinary
R. Y. Zhang, H. L. Qin, Z. N. Bi, Y. T. Tang, J. Araujo de Oliveira, T. L. Lee, C. Panwisawas, S. Y. Zhang, J. Zhang, J. Li, H. B. Dong
Summary: In this study, the gamma '' variant distribution in Inconel 718 samples was tailored through ageing heat treatment, and the variant-sensitive deformation behavior was studied through in situ tensile tests using neutron diffraction. The results showed that the yield strength varied with different gamma '' variant distributions, which can be attributed to the interactions between dislocations and different gamma '' variants.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jue Zeng, Yuqi Huang, Xu Yang, Bingxing Wang, Bin Wang
Summary: Cold-rolled Inconel 718 alloy with dispersed d phase distribution exhibited excellent superplasticity at 950 degrees C and strain rates ranging from 6 x 10(-4) to 4 x 10(-3) s(-1). A fracture elongation of 561% was achieved at a strain rate of 1 x 10(-3) s(-1). Superplastic deformation accelerated recrystallization, improving grain uniformity. The d phase dispersion promoted recrystallized grain nucleation and pinned grain boundaries to restrict grain size. Diffusion-coordinated grain boundary slip was identified as the main deformation mechanism during superplastic stretching.
MATERIALS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Junmyoung Jang, Jonghyun Yim, Seung Hwan Lee
Summary: This study investigates the formation kinetics of phases at microstructural locations in Inconel 718 (IN718) products deposited by wire arc additive manufacturing (WAAM) through various heat treatments. The heat-treated WAAM products exhibit different secondary phases compared to conventional products due to the accumulated heat during layer-by-layer deposition. The phase differences are observed in the dendritic region, interdendritic region, and grain boundaries. Time-temperature-transformation diagrams are constructed for each microstructural location, confirming faster precipitation of secondary phases in the interdendritic region and grain boundaries. The applicability of single-aging for desired mechanical properties in WAAM products is evaluated through hardness and tensile tests.
MATERIALS CHARACTERIZATION
(2022)
Article
Metallurgy & Metallurgical Engineering
Neng-yong Ye, Guang-liang Zhang, Tian-yue Huang, Ming Cheng, Shi-hong Zhang, Lei Wang
Summary: In this study, the effect of cold deformation on the precipitation of d phase in cold-rolled Inconel 718 alloy during aging was investigated. It was found that the precipitation rate and volume fraction of d phase increase with increasing cold rolling reduction. The nucleation of d phase occurs on different sites under different rolling reductions, and the growth of d phase follows a process of alternate orientation growth. The findings provide insights into the morphology evolution of d phase and its influence on the mechanical properties of Inconel 718 alloy.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
Article
Chemistry, Physical
Zheng Zhang, Debbie Hwee Leng Seng, Ming Lin, Siew Lang Teo, Tzee Luai Meng, Coryl Jing Jun Lee, Zhi-Qian Zhang, Te Ba, Junyan Guo, Kannan Sundaravadivelu, Poh Koon Aw, Jisheng Pan
Summary: This study focuses on the characteristics of Inconel 718 coatings deposited using different spray techniques, and shows that cold spray technology performs well in structural restoration applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Wen Sun, Xin Chu, Jibo Huang, Haiming Lan, Adrian Wei-Yee Tan, Renzhong Huang, Erjia Liu
Summary: In this study, Inconel 718 coatings were deposited using the high-pressure cold spray technique, and post-process solution and double aging treatments were performed. The microstructures of the as-deposited and heat-treated IN718 were examined, and their mechanical properties were evaluated. The results showed that the original micro-dendritic structures in the powder were severely elongated during the cold spray process. After solution heat treatment, the segregations of Nb, Mo, and Ti were dissolved, transforming into MC carbide and a needle-like delta phase. The needle-like delta phase acted as a pinning effect to retard grain growth. Additionally, strengthening phases were formed through aging treatments. The mechanical properties of the cold-sprayed Inconel 718 were improved with proper solution and aging heat treatments.
Article
Materials Science, Coatings & Films
Xiao Tao, John Kavanagh, Xiaoying Li, Hanshan Dong, Allan Matthews, Adrian Leyland
Summary: This study investigated the microstructural evolution, surface hardening, and general corrosion properties of a precipitation-strengthened Inconel 718 Ni-superalloy after triode-plasma nitriding at low and high treatment temperatures. The results showed different nitriding responses and nitride formation mechanisms at different temperatures.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Automation & Control Systems
Akash Sali, Vivek Patel, James Hyder, David Hyder, Mike Corliss, Wayne Hung
Summary: This paper explores the feasibility of welding Inconel 718 (IN718) and compares the quality of electron beam welded samples produced by hot rolling and laser powder bed fusing (L-PBF). The results show that both the yield and tensile strength of the welded L-PBF materials exceeded those of rolled materials and met the minimum requirement from ASTM specification. However, the ductility of the welded L-PBF material did not.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
S. Banait, X. Jin, M. Campos, M. T. Perez-Prado
Summary: This work investigates the effect of microstructure on the mechanical behavior of metallic lattice structures by manufacturing Inconel 718 bcc lattices with different microstructures and comparing their compressive behavior. The study reveals that precipitation leads to a stiffer and stronger structure with a higher capacity to absorb energy.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Jian Ren, Liming Yu, Chenxi Liu, Zongqing Ma, Huijun Li, Zumin Wang, Yongchang Liu, Hui Wang
Summary: This study investigated the effects of Al addition on the oxidation mechanisms of 16Cr ODS steel. The results showed that 16Cr-3Al ODS steel, with Al addition, exhibited superior oxidation resistance compared to 16Cr ODS steel. Thermodynamic calculations were used to explore the oxidation mechanisms of both ODS steels, and it was found that the improved oxidation resistance of 16Cr-3Al ODS steel was attributed to the lower diffusion rate of O in Al2O3.
Article
Engineering, Mechanical
Ba Hieu Nguyen, Ali Al-Juboori, Hongtao Zhu, Azdiar A. Gazder, Huijun Li, Kiet Tieu
Summary: White etching layers (WELs) on rail surfaces significantly impact rail life by promoting crack growth and leading to fracture. Mechanically-induced WELs, with higher hardness and more severe cracks compared to thermomechanically-induced WELs, are more detrimental to rail life.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Automation & Control Systems
Chunyang Xia, Zengxi Pan, Yuxing Li, Ji Chen, Huijun Li
Summary: This study proposes applying deep learning in visual monitoring to diagnose various anomalies during the wire-arc additive manufacturing process. Different representative CNN architectures were investigated and compared for their classification performance. The results demonstrate the effectiveness of CNN models in classifying different types of melt pool images.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Industrial
Jingwen Zhang, Liming Yu, Yongchang Liu, Chenxi Liu, Zongqing Ma, Huijun Li, Zumin Wang, Dijun Long
Summary: The study successfully bonded tungsten with ODS steel using a novel composite interlayer Zr/Cu and transient liquid phase diffusion technology. By optimizing processing parameters, a high-strength joint was fabricated.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yong Guan, Yongchang Liu, Zongqing Ma, Huijun Li, Hongyao Yu
Summary: This study investigates the anomalous temperature dependence of strength and the effect of initial microstructure on the deformation mechanism of CoNi-based superalloys. The results show that the anomalous yield occurs above 600 degrees C, and the initial microstructure has a significant impact on the deformation mechanism. The relationship between the initial microstructure and the deformation mechanism is discussed, and the contribution of secondary gamma ' precipitates to the strength at the peak temperature is quantitatively assessed.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Jian Ren, Liming Yu, Chenxi Liu, Zongqing Ma, Huijun Li, Zumin Wang, Yongchang Liu, Hui Wang
Summary: The study systematically investigated the creep properties, microstructural evolution, and fracture mechanism of 16Cr-3Al ODS steel under different uniaxial tensile stresses at 600 degrees C. The relationship between the minimum creep rate and mean creep rate was linear, with a determined threshold stress. The evolution of the Cr-rich phase played a significant role in the fracture mechanism of 16Cr-3Al ODS steel after creep deformation.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Engineering, Manufacturing
G. K. Sujan, Huijun Li, Zengxi Pan, Daniel Liang, Nazmul Alam
Summary: The study found that post solution-annealed (SA) samples of IN718 superalloys fabricated using WAAM process maintained highly-textured solid-solution of gamma-matrix, but formed undissolved residual laves phases in Nb-enriched regions. High-temperature oxidation studies showed that oxidation mechanisms were temperature dependent, with the growth of oxide scale primarily dominated by the outward diffusion of Cr+3 cations.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Bintao Wu, Zhijun Qiu, Bosheng Dong, David Wexler, Zengxi Pan, Kristin Carpenter, Diego Raimundi Corradi, Huijun Li
Summary: In this study, the microstructure and mechanical properties of wire arc additively manufactured Ti6Al4V alloy with/ without magnetic arc oscillation were investigated. The results showed that the addition of magnetic arc oscillation resulted in refinement of the microstructure, modification of texture orientation, and improvement of mechanical properties of the deposition.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Mechanical
Abdul Haseeb Afridi, Hongtao Zhu, Eduardo Tovar Camacho, Guanyu Deng, Huijun Li
Summary: Rolling contact fatigue (RCF) crack is a dominant form of damage on rail surfaces caused by repeated contact with wheels. If left untreated, RCF defects such as squats and head checks can lead to rail fractures. Accurately predicting the damage under different operational conditions is crucial. A two-stage simulation strategy was proposed, investigating the mechanisms of RCF-induced cracks on rails through dynamic FEM for wheel-rail interaction and coupled static FEM/BEM for crack growth. The study found two critical wheel positions for crack propagation during wheel approach and departure from pre-existing cracks.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Mechanical
Ba Hieu Nguyen, Ali Al-Juboori, Hongtao Zhu, Qiang Zhu, Huijun Li, Kiet Tieu
Summary: This study systematically investigates the formation mechanism and evolution of white etching layers (WELs) on standard carbon (SC) rail and head hardened (HH) rail. The results show that repeated rolling contact influences the formation and distribution of WELs, and HH rail is more susceptible to WELs than SC rail.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
S. S. Chen, P. D. Song, J. Yin, K. Qi, H. D. Li, L. Hou, W. H. Li
Summary: This study reports on a plasma electrolytic oxidation (PEO)-treated Mg-Zn-Ca-Si amorphous alloy composite with enhanced plasticity and corrosion resistance. The coated material exhibits excellent mechanical properties in compression and a significant decrease in corrosion current density after treatment.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
J. M. Yu, T. Hashimoto, H. T. Li, N. Wanderka, Z. Zhang, C. Cai, X. L. Zhong, J. Qin, Q. P. Dong, H. Nagaumi, X. N. Wang
Summary: In this study, the microstructure of AA6082 alloy under different manufacturing processes was investigated using three-dimensional visualization. The results showed that the formation of supersaturated solute front at the α-Al solid-liquid interface is the key condition for the formation of Fe-bearing intermetallics and Mg2Si phase. Grain refinement processing leads to severe interconnectivity of Fe-bearing α-intermetallics, while intensive melt shearing process can more evenly distribute and refine the intermetallics, thereby improving the properties of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Y. Sun, R. Jiang, L. F. He, Z. C. Li, R. D. K. Misra, H. P. Li
Summary: This study proposes a method of preparing 7075/Zr44Ti11Cu10Ni10Be25/7075 composites through stacked hot extrusion process, and systematically investigates the effects of extrusion conditions on the connected interfaces and thickness uniformity of the composites. The results show that the extrusion speed and temperature have significant effects on the crystallization and phase separation of the amorphous alloy. The most uniform and continuous interlayers can be obtained under optimal extrusion conditions, and the hardness of the interlayers is inversely related to the extrusion temperature and speed.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Manufacturing
Zhe Liu, Wei Guan, Huijun Li, Dongpo Wang, Lei Cui
Summary: This paper investigated the characteristics of traverse force (Fx), lateral force (Fy), and axial force (Fz) in bobbin tool friction stir welding (BTFSW) and their relationship with welding defects. The study found that the average value of Fy determined whether defects occurred in the weld. Analysis of material flow behavior revealed that an increase in Fy was due to severe material deposition on the retreating side (RS). Based on these findings, a decision tree model was built to predict welding defects, achieving an accuracy of 95.3%.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Chemistry, Physical
Yangfan Wang, Zhiyang Wang, Arman Hobhaydar, Zhijun Qiu, Bosheng Dong, Qinfen Gu, Zengxi Pan, David Wexler, Hanliang Zhu, Xizhang Chen, Mingxing Zhang, Huijun Li
Summary: Novel low activation medium entropy alloys (MEAs) of FeCr2V and FeCr2VW0.1 were developed as potential nuclear structural materials. The materials were fabricated using arc melting and their microstructure and mechanical properties were investigated. The results show that the developed MEAs exhibited a dual-phase microstructure consisting of body-centered-cubic (BCC) phases. The addition of W significantly enhanced the solid solution strengthening (SSS) and precipitation strengthening (PS) in the studied alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(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)