Article
Metallurgy & Metallurgical Engineering
Dazhao Li, Zhijie Yan, Rui Wang, Yan Kang, Liyuan Shen
Summary: The paragraph discusses the characteristics and applications of low-alloyed, multiphase, high-strength steels, emphasizing the need to study the phase transformations in order to enhance material properties effectively.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Zhaozhen Cai, Jiazhi An, Biao Cheng, Miaoyong Zhu
Summary: Austenitic grain size is an important factor affecting the hot ductility of steel slabs during continuous casting. The increase in austenite grain size decreases the volume fraction of film-like proeutectoid ferrite and the average diameter of Nb(C, N) precipitates, leading to strain concentration and a decrease in hot ductility.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Qingjuan Wang, Zeen He, Zhongze Du, Qinren Wang, Xue Dang, Zejiang Qi, Congcong Yang
Summary: Hot compression experiments were conducted on 42CrMo steel to investigate the microstructure evolution and flow behavior under different deformation conditions. The results show that the flow curves exhibit significant peaks at low strain rates and high temperatures, with peak stress increasing at lower deformation temperatures and higher strain rates. The critical points of dynamic recrystallization (DRX) were derived from the work-hardening curves, and the relationship between peak and critical strains was determined. The softening mechanism was found to be a combination of dynamic recovery (DRV) and DRX at low temperatures, while mainly DRX at high temperatures, with coarsening of the deformed DRX grains at low strain rates.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Xiangyu Xu, Zepeng Yan, Zhenzhen Niu, Xueliang Shang, Xuemin Wang, Chengjia Shang
Summary: The hot working behavior of Al-alloyed delta-ferritic/martensitic dual-phase steel was investigated in this study using experiments and simulations to explore steady-state stress, apparent deformation activation energy, microstructure, and dynamic restoration mechanisms. The study found that the primary dynamic restoration mechanism of delta-ferrite changed with increasing deformation temperature and strain rate, highlighting the importance of parameter design in industrial processing.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Yuming Qi, Heming Xu, Tengwu He, Miao Wang, Miaolin Feng
Summary: Molecular dynamics simulations of a typical polycrystalline CoCrFeMnNi high-entropy alloy reveal that FCC -> HCP phase transformation is the dominant plastic deformation behavior in the early stages, while twinning induced plasticity plays a critical role at large strains.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Chao Wu, Yang Zhao, Xiaofeng Xu, Yachong Zhou, Xudong Yan, Zhicheng Wu, Lai We, Xiaoming Qiu
Summary: Electropulsing treatment can eliminate the hot-rolled and annealed texture in 35CrMo steel and produce a new <100> texture. The texture evolution law induced by electropulse was established by preparing gradient current density in steel. Electron backscattered diffraction and micro-region X-ray diffraction were used to study texture evolution. The observed phenomenon is attributed to the suppression and preferential grain growth caused by different scattering degrees of electron flow with various grain orientations.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Xiangyu Xu, Xuemin Wang, Jianzhe Li, Zepeng Yan, Dan Liu, Qiannan Liu, Chengjia Shang, Jianxun Fu, Ping Shen
Summary: The hot-working behavior of a low-density Fe-4Al-1Ni ferritic steel at the deformation temperature in the range of 700-950 degrees C and the strain rate in the range of 0.01-10 s(-1) was studied, including the deformation mechanism, apparent deformation activation energy, and recrystallization behavior. The experimental results showed that increasing temperature and strain rate contribute to the occurrence of discontinuous dynamic recrystallization.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yang Liu, Yan-hui Sun, Hao-tian Wu
Summary: Chromium has a significant influence on the gamma/alpha phase transformation and high-temperature mechanical properties of Nb-microalloyed steel. The addition of 0.12wt% chromium can improve hot ductility, reduce the thickness of grain boundary ferrite, increase the number fractions of high-angle grain boundaries, and subsequently enhance the ductility of Nb-microalloyed steel.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
Sun Yi, Zheng Qinyuan, Hu Baojia, Wang Ping, Zheng Chengwu, Li Dianzhong
Summary: This study aims to investigate the microstructural behavior of deformation-induced ferrite transformation (DIFT) in Medium Mn steels (MMSs) in order to understand the formation and post-deformation conservation of ultrafine ferrite. The results showed that DIFT occurs in the alpha+gamma region of thermomechanically processed MMSs, resulting in characteristic multiphase microstructures that consist of isolated martensite and fine-grained equiaxed ferrite with islands of retained austenite dispersed between ferrite grains. Enhanced ferrite nucleation at alpha/gamma interfaces during DIFT increases nucleation density and facilitates impingement among neighboring grains. The partitioning of Mn between ultrafine ferrite and austenite is accelerated during DIFT, leaving numerous Mn-enriched islands of austenite untransformed at grain boundaries or triple junctions, which play critical roles in retaining austenite at room temperature and conserving the ultrafine microstructure of DIFT during post-deformation processing.
ACTA METALLURGICA SINICA
(2022)
Article
Nanoscience & Nanotechnology
Jianquan Wan, Haihui Ruan, Zhiyi Ding, Ling Bing Kong
Summary: A new ultra-high strength maraging stainless steel with a unique combination of intermetallic precipitates has been developed, enabling its ultimate tensile strength to reach 3.15 GPa with balanced ductility and uniform elongation. Maximizing the austenite content before cold-rolling and ageing treatments is crucial to achieve such high strength without sacrificing uniform elongation. Precipitation hardening is significantly enhanced by the net-like sigma phase during tensile deformation, peaking at an ageing temperature of 525 degrees C for 3.5 hours.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Ali Ameri, Hongxu Wang, Zongjun Li, Zakaria Quadir, William D. A. Rickard, Manny Gonzalez, Paul J. Hazell, Juan P. Escobedo-Diaz
Summary: Microstructural changes and ferrite phase transformation under shock loading between 8.5 GPa and 17.5 GPa in a hot-rolled Lean Duplex Stainless Steel were investigated, revealing a reversible phase transformation in ferrite at a peak stress of around 17 GPa, leading to a considerable increase in yield stress.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Liping Zhong, Bo Wang, Chundong Hu, Jieyu Zhang, Yu Yao
Summary: The study aimed to improve the microstructure uniformity of an ultra-high strength martensitic steel through experimental and simulation research. By establishing suitable process parameters and models, the research provided insights into obtaining forging stock with a uniform and refinement microstructure, which is essential for formulating appropriate forging processes.
Article
Chemistry, Physical
Guo-Zheng Quan, Yan-Ze Yu, Yu Zhang, Yu-Qing Zhang, Wei Xiong
Summary: The effect of quenching time and die temperature on the phase transformation characteristics and mechanical property of ultra-high-strength steel during hot stamping was studied. The temperature, quenching time, and three microstructures were mapped, and their mapping relationships were explained by microstructural observations. Based on the test results of mechanical properties, mapping surfaces were constructed for hardness, tensile strength, and elongation at break, which varied with die temperature and quenching time. The constructed mapping surfaces are helpful for adjusting the local mechanical property of the steels by designing the parameters.
Article
Materials Science, Multidisciplinary
Changchang Liu, Ji Gu, Min Song
Summary: This study investigates the hot rolling treatment and water quenching process on a TC18 titanium alloy, revealing the formation of a new phase induced by stress and assisted by another phase. The existence of a new phase and diffuse streaks during hot working were also observed. The research confirms the presence of dynamic recrystallization (DRX), with recrystallization grains nucleating preferentially at high-energy areas such as grain boundaries and shear bands. The elongation decreases and tensile strength increases with increasing deformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Veronica Collado Cipres, Jose Garcia, Jose Maria Cabrera, Luis Llanes
Summary: The hot deformation behavior of sintered cobalt was investigated under high temperature and compression testing conditions, revealing considerable dynamic recrystallization and a model to describe the flow stress behavior. The results indicated that the deformation mechanism of cobalt was mainly controlled by dislocation glide and climb, with slightly different characteristics exhibited at different temperatures.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Automation & Control Systems
Zhuoyuan Li, Jian Zhang, Yang Liu, Qingmao Zhang, Xizhang Chen, Shufeng Sun, Namrata Gangil, Arshad Noor Siddiquee
Summary: Laser surface quenching treatment can significantly improve the microstructure of steel and eliminate defects, and the laser energy density plays a key role in the dissolution of carbides, with higher energy density producing better results.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Thermodynamics
Pengyi Huang, Zongwang Chen, Jian Zhang, Mingge Wu, Yang Liu, Fengyun Zhang, Yifeng Chen, Xizhang Chen
Summary: This study prepared stainless steel bipolar plates with different flow field structures using the SLM technique and analyzed the effects of different flow field structures on the performance of PEMFC through polarization test and numerical simulation. The results showed that the square mesh flow field bipolar plate had better performance, including higher power density and more uniform gas and water distribution.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Multidisciplinary
Lei Huang, Xizhang Chen, Sergey Konovalov, Mi Wang, Chuanchu Su, Lei Han, Yanhu Wang
Summary: A mathematical model based on the response surface methodology (RSM) is developed to analyze the effects of key processing parameters on solidification cracks in aluminum alloys produced by cold metal transfer (CMT) welding. The model is shown to be reliable and capable of predicting the occurrence of cracks. Wire feeding speed and wire withdrawal are identified as the critical factors leading to solidification cracks. The optimization of processing parameters results in a visual parameter map that indicates the crack-free area for easier operation.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Qiang Li, Xiao Chen, Xizhang Chen, Arshad Noor Siddiquee, Vladislav B. Deev, Sergey Konovalov, Ming Wen
Summary: The microstructure and texture evolution during thermo-mechanical processing and their relationship with the mechanical properties were investigated in the non-equiatomic CoCrFeNiAl0.4 high-entropy alloy. It was found that annealing twins play a significant role in the texture evolution, and the work hardening rate is relatively stable under 30%-45% plastic deformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Chao Zhou, Youzhi Zhang, Jelena Stasic, Yu Liang, Xizhang Chen, Milan Trtica
Summary: High-entropy alloys (HEAs) have gained significant attention since their introduction in 2004. Machine learning (ML) is proposed as a tool to accelerate the research on new HEAs. Unlike the traditional melt-casting method, additive manufacturing (AM) has the potential for rapid prototyping and manufacturing of complex-shaped parts. The ML method proposed in this study takes into account the AM process parameters to predict the hardness of HEAs. Experimental results show that incorporating process parameters into ML improves the prediction accuracy by 4%, with an overall accuracy of 89% and an average prediction error of 3.83% for new HEAs.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Heyang Xin, Xizhang Chen, Yanhu Wang, Chuanchu Su, Dongqun Xin, Jiayi Xia, Yu Liang
Summary: In this study, the evolution of microstructure and mechanical properties of CoFeNiMnV high-entropy alloys (HEAs) fabricated by powder plasma arc additive manufacturing (PPA-AM) was investigated using a combination of cold rolling and annealing treatment. Cold rolling significantly refined the grain size and improved the hardness and strength of the alloy. Annealing treatment at different temperatures resulted in reduced dislocation density, dissolution of sigma phase, and coarsening of recrystallized grains and annealing twins. CoFeNiMnV HEAs annealed at 700 degrees C for 60 min after cold rolling exhibited an excellent high strength-toughness combination.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Nuclear Science & Technology
Milan Trtica, Jelena Stasic, Xizhang Chen, Jiri Limpouch, Petr Gavrilov, Andrijana Zekic
Summary: The behavior of ODS steel under high energy fluxes is significant as it is a promising material for fusion reactors. The addition of hafnium improves the microstructure and mechanical properties at high temperatures. This study investigated the effects of high-intensity -1015 W/cm2 radiation on Hf-containing ODS steel using ultrashort pulsed laser. Morphological and chemical analysis was conducted in different environments, revealing new data on damage parameters, threshold fluences, and chemical changes. The measured damage depths were -7.5 μm (air), -14 μm (helium), and -48 μm (vacuum), which were slightly lower compared to ODS steel without hafnium addition.
FUSION ENGINEERING AND DESIGN
(2023)
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
Materials Science, Multidisciplinary
Zefang Chen, Kang Peng, Xizhang Chen, Qichen Wang, Yu Liang
Summary: This study investigated the effect of ER2209 multi-stranded wire on the microstructure and pitting resistance of 2205 duplex stainless steel submerged arc welded joints, compared to single wire welding. The use of multi-stranded wire resulted in more metal deposition and doubled the welding efficiency, while increasing the concentration of Ni in the weld metal and the proportion of austenite in the heat-affected zone. Multi-stranded wire welding also promoted the diffusion of main alloying elements and improved the mechanical properties and pitting resistance of the welded joint.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Bang Shi, Dongqun Xin, Xizhang Chen, Yanhu Wang, Arvind Singh
Summary: In this study, a Cu28.36 Ni22.32 Fe19.12Co15.17Cr12.26Mo2.77 HEA with dual FCC phase was successfully prepared, which exhibited excellent plasticity, toughness, and mechanical properties, with lower production cost.
Article
Engineering, Manufacturing
Chuanchu Su, Yanhu Wang, Weimin Wu, Sergey Konovalov, Lei Huang, Xizhang Chen, Shuyang Qin
Summary: In this study, a new wire + powder synchronous arc additive manufacturing technique was used to fabricate Ti-Cu alloys. The microstructure and properties of the as-fabricated alloys were investigated. The results demonstrated that the prepared Ti-Cu alloys exhibited good properties. The presence of Cu with high growth restriction factor created a larger constitutional supercooling zone in the Ti-Cu alloys, which counteracted the detrimental effect of high thermal gradient during the manufacturing process. The as-printed Ti-Cu alloy specimens exhibited equiaxed fine-grained microstructure, as observed through microstructure analysis. Moreover, Cu also improved the compactness of the passivation film and enhanced the corrosion resistance of the alloy, as determined by corrosion performance analysis.
3D PRINTING AND ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Dongqun Xin, Xiucong Yao, Jian Zhang, Xizhang Chen
Summary: The study successfully fabricated thin-walled stainless steel 304 L/Inconel625 compositionally graded materials using an innovative twin-wire plasma arc additive manufacturing (TW-PAAM) process. Sharp changes in composition between 304 L and In625 resulted in significant variations in microstructural morphology and hardness, while gradual transition and crack formation were observed in the higher In625 content region. The study provides insights into optimizing the wire arc additive manufacturing process to avoid cracks and weakening of properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Mengyue Wang, Xizhang Chen, Fengze Dai, Kang Peng, Ramachandra Arvind Singh, Sergey Konovalov
Summary: In this paper, laser shock imprinting (LSI) is proposed to improve the fatigue performance of aero-engine blades. By using a contact film with micro-grooves, the surface morphology of the blades is transformed to enhance their fatigue performance. The study shows that by adjusting the process parameters, such as peak pressure and impact number, the residual stress and micro-plastic deformation of the blade surface can be controlled, leading to an improved surface morphology.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yifei Huang, Dongqun Xin, Xizhang Chen
Summary: In this study, a Ni49Ti51 shape memory alloy was successfully prepared using the double-wire arc additive manufacturing process. The microstructure of the alloy consists mainly of NiTi (B19 '), NiTi (B2), and NiTi2 phases. The alloy demonstrates significantly increased compressive strength and fracture strain compared to the plasma arc powder melting process, and exhibits a superior shape memory effect with a recovery rate of up to 88%.
Article
Optics
Lei Wu, Fengze Dai, Shu Huang, Xizhang Chen
Summary: Laser shock imprinting (LSI) was used to improve the fatigue performance of TC4 titanium alloy. The effects of shock wave pressure and contact foil thickness on surface topography and residual stress were studied through experiments and finite element modeling. Thicker contact foils were found to effectively mitigate the surface roughness and reduce residual stress difference. LSI is a promising technique for enhancing the fatigue performance of workpieces.
OPTICS AND LASER TECHNOLOGY
(2024)
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)
