Article
Materials Science, Multidisciplinary
Ikumu Watanabe, Ta-Te Chen, Sachiko Taniguchi, Houichi Kitano
Summary: This paper investigates the microstructural heterogeneity and deformation mechanism of duplex multilayer steel structures fabricated by wire and arc additive manufacturing (WAAM). The study reveals that the austenite phase transformed into the martensite phase during tensile testing, leading to the generation of a two-stage stress-strain curve.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Shujun Chen, Min Xu, Tao Yuan, Xiaoqing Jiang, Hongda Zhang, Xing Zheng
Summary: The mechanism of crack formation in Al-Zn-Mg-Cu alloy parts manufactured by wire-arc additive manufacturing was studied. The study found that increasing the number of deposition layers expanded the partial melting zone and led to heat accumulation, increasing crack sensitivity. Cracks initially appeared near the bottom and propagated upwards with further deposition.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Min Xu, Hongda Zhang, Tao Yuan, Zhaoyang Yan, Shujun Chen
Summary: In this study, the mechanism of crack formation in WAAM Al-Cu alloy parts was investigated. It was found that liquation cracks at high-angle grain boundaries and temperature exceeding the eutectic temperature were the primary causes of cracks in the parts. This finding is significant for improving the manufacturing process of WAAM Al-Cu alloys.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Manufacturing
Gerald L. Knapp, Maxim Gussev, Amit Shyam, Thomas Feldhausen, Alex Plotkowski
Summary: This study investigated the tensile deformation response of an Al 4043 alloy deposited on an Al 6061-T6 substrate using a laser hot-wire AM process. It was found that localized deformation occurred at the melt pool boundary regions and accumulated strains mainly happened in those regions, as confirmed by EBSD post-test analysis.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Yinghui Zhou, Xin Lin, Nan Kang, Yao Tang, Weidong Huang, Zhennan Wang
Summary: The study obtained a heterogeneous band structure of a 2219 Al alloy using wire + arc additive manufacturing. The water-cooled deposit exhibited higher volume fraction of columnar grains and better mechanical properties, compared to the air-cooled deposit. The different deformation patterns and dislocation coordination of the columnar and equiaxed grains explained the differences in mechanical properties.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Xiaoyu Cai, Yunhao Xia, Bolun Dong, Tiansheng Zhou, Sanbao Lin
Summary: This study aims to analyze the microstructure evolution of Al-Zn-Mg-Cu alloy under different process parameters and reveal the relationship between solidification behavior, pore defects, and grain morphology. The results show that different process parameters have different effects on defect formation and grain growth in the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Thomas Klein, Leonhard Reiter, Martin Schnall
Summary: This study investigates the wire-arc additive manufacturing, microstructure, and mechanical properties of AlZn5.5MgCu alloy. The results show crack-free specimens with mechanical properties similar to wrought AlZn5.5MgCu. The authors suggest that the intrinsic heat-treatment affects the processability of this alloy.
Article
Materials Science, Multidisciplinary
Bang Liu, Xinya Chen, Guoyang Zhang, Xin Zhang, Jian Han
Summary: In this study, a Ti-Ni-Cu-Al-V component was produced using wire + arc additive manufacturing method, and its microstructure and mechanical properties were analyzed. The results showed that the component had high hardness and compressive strength, but brittle fracture occurred.
Article
Engineering, Manufacturing
Yunfei Meng, Jian Li, Ming Gao, Xiaoyan Zeng
Summary: The study investigated the fabrication of Ni-Al intermetallic compounds using wire arc additive manufacturing (WAAM) technology, showing that the microstructure and mechanical properties of the deposited samples were influenced by the nickel content. Increasing nickel content led to changes in the microstructure and mechanical properties of the deposited samples.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Engineering, Manufacturing
Thomas Klein, Martin Schnall, Bianca Gomes, Piotr Warczok, Dominik Fleischhacker, Paulo J. Morais
Summary: Wire-arc additive manufacturing (WAAM) is a viable technology for producing metallic components of medium complexity at a high deposition rate. A novel alloy system based on the Al-Zn-Mg-Cu system has been successfully developed for WAAM, exhibiting optimal mechanical properties and a pronounced age-hardening response. The alloy, with an isotropic proof stress of up to around 340 MPa and a fracture strain of up to around 11%, has been demonstrated to be suitable for advanced applications, as shown through the fabrication of a motorcycle piston.
ADDITIVE MANUFACTURING
(2021)
Article
Chemistry, Physical
Min Xu, Shujun Chen, Tao Yuan, Xiaoqing Jiang, Hongda Zhang
Summary: This study investigates the microstructure evolution and mechanical behavior of Al-Zn-Mg-Cu alloys during wire-arc additive manufacturing (WAAM) thermal cycles. The results show that the part contains microcracks, pores, and interdendritic crystalline phase, which decrease the tensile properties. The grain morphology has an effect on the tensile properties, and the hardness shows different variations after thermal cycles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Jie Tang, Jinhai Wang, Jie Teng, Guan Wang, Dingfa Fu, Hui Zhang, Fulin Jiang
Summary: Increasing Zn content in Al-Zn-Mg-Cu alloys accelerates work hardening rate but has a mixed effect on peak stress and hot deformation activation energy. Dynamic softening increases gradually with higher Zn content due to accelerated dynamic precipitation, while it decreases with low Zn content as dynamic recovery and recrystallization are hindered by Zn addition.
Article
Engineering, Manufacturing
Zhennan Wang, Xin Lin, Lilin Wang, Yang Cao, Yinghui Zhou, Weidong Huang
Summary: Understanding the formation and evolution mechanism of microstructure in WAAM processed Al-Cu alloy is crucial for achieving higher and isotropic mechanical properties. The study revealed the heterogeneous characteristics between ITZ and INZ, as well as the influence of prior precipitation of Al3Zr particles on equiaxed grain formation. Furthermore, the presence and evolution of theta ''-Al2Cu phases in Cu-rich regions and their transformation under in-situ thermal effect during WAAM deposition were also discussed.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Leilei Wang, Dan Chen, Zhuanni Gao, Feiyue Lyu, Xiaohong Zhan
Summary: Wire arc additive manufacturing (WAAM) allows for flexible and efficient production of large-scale aircraft components. However, the effects of thermal processes during manufacturing and high-speed flight on the microstructure, mechanical properties, and lifetime of WAAM components have not been well studied. This paper investigates the evolution of microstructure, temperature field, stress distribution, and mechanical properties of 2319 aluminum alloy during the WAAM process and simulated high-speed flight. The results show that the as-built microstructure evolves slightly after thermal service, with a more uniform grain distribution and less evident layer boundaries. The WAAM component retains its mechanical properties after thermal service, and the maximum stress value and stress distribution can be significantly affected by the wire feeding rate and scanning speed. The tensile strength of the WAAM sample increases after the first thermal service and decreases after the tenth thermal service, due to microporous aggregation fracture.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Engineering, Manufacturing
Rui Fu, Wenjun Lu, Yueling Guo, Hongshuai Lei, Yinan Cui, Jiarong Wang, Di Gao, Jiachen Wang, Changmeng Liu
Summary: Through hot-wire arc additive manufacturing (HWAAM) technology, the microstructure and mechanical properties of Al-Zn-Mg-Cu alloy were improved. The alloy samples had equiaxed grains and low porosity, crack-free parts were obtained after heat treatment, and acceptable mechanical properties were achieved.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Mechanical
Shuo Li, Mohamed El Mansori, Qingzheng Wang, Nan Kang, Mourad El Hadrouz
Summary: The addition of quasicrystals can reduce the wear of aluminum alloy, and the hardness of reinforcement phases contributes to the formation of a mechanical mixing layer, thereby reducing friction and improving wear resistance.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Materials Science, Multidisciplinary
Shun Lv, Jinshan Li, Shufeng Li, Nan Kang, Biao Chen
Summary: The reinforcing effect of short carbon fibers (CFs) in Ti-6Al-4V (TC4) matrix composites was investigated through mechanical testing and microstructure analysis. It was found that CFs/TC4 composites exhibit ductile fracture at elevated temperatures, and the reinforcing effect of CFs becomes more prominent with increasing temperature.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Zehao Qin, Nan Kang, Fengying Zhang, Zihong Wang, Qian Wang, Jing Chen, Xin Lin, Weidong Huang
Summary: This study investigates the high cycle fatigue properties of an Al-Mg-Sc-Zr alloy manufactured via SLM with optimized parameters, finding periodic, inhomogeneous microstructure causing reduced fatigue life. X-ray CT results show random distribution of mainly porosity defects initiating fatigue crack. Annealed samples exhibit good fatigue strength close to high-strength 7075Al. A fatigue crack propagation mode related to defect microstructure characteristics is established for predicting fatigue properties.
INTERNATIONAL JOURNAL OF FRACTURE
(2022)
Article
Metallurgy & Metallurgical Engineering
Haoxiang Wang, Xin Lin, Nan Kang, Zehao Qin, Shuoqing Shi, Jiacong Li, Weidong Huang
Summary: Hybrid manufacturing combines additive manufacturing techniques with traditional processing methods to create complex structures on regular components. This study used selective laser melting to produce a bimetal material on a deformed Al6061 alloy substrate, and investigated the interface characteristics and mechanical properties of the hybrid manufactured samples.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Engineering, Manufacturing
Yinghui Zhou, Xin Lin, Nan Kang, Yao Tang, Weidong Huang, Zhennan Wang
Summary: The study obtained a heterogeneous band structure of a 2219 Al alloy using wire + arc additive manufacturing. The water-cooled deposit exhibited higher volume fraction of columnar grains and better mechanical properties, compared to the air-cooled deposit. The different deformation patterns and dislocation coordination of the columnar and equiaxed grains explained the differences in mechanical properties.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Zehao Qin, Nan Kang, Mohamed El Mansori, Zihong Wang, Haoxiang Wang, Xin Lin, Jing Chen, Weidong Huang
Summary: This study investigates the defects, microstructure, and fatigue properties of Sc and Zr-modified Al-Mg alloy fabricated by laser powder bed fusion (LPBF) in different building directions. The research finds that transversely deposited (TD) samples exhibit higher fatigue strength due to the defects and microstructure. The lack of fusion leads to higher stress concentration in the parallelly deposited (PD) samples, while the indistinctive crack deflection and possible cyclic softening of columnar grains result in decreased fatigue resistance.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Industrial
Jinglin Lu, Xin Lin, Nan Kang, Yang Cao, Qingzheng Wang, Jiacong Li, Lingyu Zhang, Weidong Huang
Summary: The microstructure and mechanical properties of Al-Mn-Sc alloys fabricated by selective laser melting were studied. It was found that the precipitation sequence and Sc/Mn ratio were critical for controlling the grain and precipitate characteristics. The pre-precipitated Mn-bearing particles inhibited the formation of Al3Sc, resulting in a columnar grain structure, while the preferentially precipitated Al3Sc induced a bimodal grain structure and led to cracking in regions with mismatched deformation capacity.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yanfang Wang, Xin Lin, Nan Kang, Zihong Wang, Yuxi Liu, Weidong Huang
Summary: A direct aging regime was proposed to maintain the grain-boundary strengthening and precipitation strengthening in modified conventional wrought aluminum alloys, resulting in a higher yield strength compared to the normal T6 heat treatment. The direct aging treatment preserved the ultrafine grains and precipitated spherical L1(2)-Al3Zr particles, while the solution treatment and aging led to grain coarsening and the presence of coarsening L1(2)-Al3Zr particles, nano-sized S' phases, and GPB zones. Both the direct aging and solution treatment and aging samples exhibited higher strength than other SLMed Al-Cu-Mg series alloys, comparable to the wrought AA2024-T6 alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Yanfang Wang, Xin Lin, Nan Kang, Zihong Wang, Qingzheng Wang, Yuxi Liu, Weidong Huang
Summary: In this study, Zr-modified 2024Al alloy deposits were prepared using L-PBF technology, with the addition of 1.3wt% Zr, which reduced the solidification cracking susceptibility and improved the grain structure of the alloy. After T6 heat treatment, the yield strength and ultimate tensile strength of the alloy were further increased, reaching comparable or even higher levels than conventional wrought alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Q. Z. Wang, X. Lin, N. Kang, X. L. Wen, Y. Cao, J. L. Lu, D. J. Peng, J. Bai, Y. X. Zhou, M. El Mansori, W. D. Huang
Summary: Understanding the effect of reinforcements on microstructure evolution and strengthening mechanism is crucial for developing good performance aluminum matrix composites (AMCs) prepared by laser additive manufacturing (LAM). In this study, the roles of submicron-TiB2 particles in the grain morphology evolution, mechanical properties, and corresponding strengthening mechanism of the 2024Al matrix processed by laser directed energy deposition (L-DED) and laser powder bed fusion (L-PBF) were compared. The results show that the L-DED processed TiB2p/2024Al composite has equiaxed grains, while the L-PBF processed composite only shows refinement in columnar grains. Both L-DED and L-PBF fabricated 3 wt% TiB2p/2024Al composites exhibit enhanced strength and plasticity due to grain refinement. Grain boundary strengthening, dislocation strengthening, and load transfer strengthening contribute to the increased yield strength in L-DEDed TiB2p/2024Al sample.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Bo Yao, Xufei Lu, Liang Ma, Nan Kang, Shang Sui, Hua Tan, Jing Chen
Summary: In laser blown powder directed energy deposition (DED), the self-regulation effect (SRE) is a unique phenomenon that compensates for the sloping deposition surface induced by process fluctuations or part warpage. Previous numerical studies on DED have overlooked the variable layer thickness and the credibility of simulations. In this study, an improved modeling process considering SRE is proposed, and experimental measurements are used to quantify the relationship between layer thickness and powder standoff distance (PSD) and inter-layer temperature (ILT). Two thermo-mechanical finite element (FE) models are established to examine the proposed modeling strategy, and the results demonstrate that the model with SRE significantly improves the mechanical and geometric predictions of DED parts.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Automation & Control Systems
Qingzheng Wang, Xin Lin, Mohamed El Mansori, Yang Cao, Nan Kang, Weidong Huang
Summary: This work investigated the heat-induced microstructure evolution and mechanical properties of the TiB2p/2024Al composite prepared by SLM. The as-deposited composite exhibited a gradient microstructure and mechanical properties, but this gradient could be eliminated and the mechanical properties could be improved through solid solution and aging heat treatment.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Wendi Shi, Yahui Yang, Nan Kang, Minjie Wang, Biao Chen, Yulong Li, Umeda Junko, Katsuyoshi Kondoh, Jianghua Shen
Summary: This study adopted the selective laser melting (SLM) additive manufacturing method to produce high oxygen-doped commercial purity titanium (Ti-O). The results showed that the TiO2 powders decomposed under the SLM process and the oxygen atoms were presented as solid solutes. The strength of SLM Ti-O drastically increased regardless of loading rate, while pure Ti and Ti-O alloy exhibited distinct strain rate sensitivity. The difference between these SLM samples was found to closely relate with their microstructures.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Xiaoli Wen, Bin Chen, Zhao Chen, Xin Lin, Haiou Yang, Nan Kang, Qingzheng Wang, Weili Wang, Weidong Huang
Summary: The microstructural evolution and mechanical properties of 3 wt% TiB2p reinforced 2024Al composite after T6 heat treatment were investigated. It was found that the T6 heat treatment led to the formation of ultrafine Al2CuMg precipitates and a small amount of AlCuMnFe (T) dispersoids. Quantitative analysis revealed that grain refinement and Orowan strengthening contributed to the high strength of the annealed TiB2p/2024Al composite.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zehao Qin, Nan Kang, Huajing Zong, Chunhui Zhan, Yanbo Fang, Zihong Wang, Mohamed El Mansori, Jing Chen, Xin Lin, Weidong Huang
Summary: This study applies hot isostatic pressing (HIP) to enhance the fatigue properties of L-PBFed alloys by healing porosities and promoting oxidation, highlighting the critical role of oxides in fatigue performance.
MATERIALS RESEARCH LETTERS
(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)
