Article
Crystallography
Liyuan Sheng, Xingru Zhang, Hui Zhao, Beining Du, Yufeng Zheng, Tingfei Xi
Summary: In this study, a Mg-4Zn-1.2Y-0.8Nd alloy was subjected to heat treatment and hot extrusion with different passes to investigate the microstructure evolution and mechanical properties. The results demonstrated that the heat treatment and hot extrusion processes were effective in refining the secondary phases and matrix, leading to improved ductility and strength of the alloy. Specifically, the two-pass hot extrusion significantly enhanced the ductility and strength simultaneously by producing a ultrafine alpha-Mg matrix with uniform grain size and a redistributed secondary phase.
Article
Chemistry, Physical
Milad Maleki, Susanne Berndorf, Sara Mohammadzehi, Hamed Mirzadeh, Massoud Emamy, Madlen Ullmann, Ulrich Prahl
Summary: The high strength Mg-4Zn-0.5Ca-0.5RE magnesium alloy was subjected to different hot deformation processes to refine its grain structure and enhance its mechanical properties. The extrusion process resulted in a dynamically recrystallized microstructure which improved the mechanical properties compared to the as-cast counterpart, while the forging process led to a partially recrystallized microstructure, indicating the need for high strains. The combination of extrusion and forging was found to be effective in achieving more intense grain refinement and improved strength without sacrificing ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Crystallography
Honglin Zhang, Zhigang Xu, Laszlo J. Kecskes, Sergey Yarmolenko, Jagannathan Sankar
Summary: The study investigated the effect of extrusion temperatures on Mg-1.3Zn-0.5Ca alloys, finding that higher temperatures led to larger and more dynamic recrystallized grains. The alloys extruded at different temperatures showed varying mechanical properties, with improved elongation at 400 degrees C but higher ultimate tensile strength and yield strength at 300 degrees C.
Article
Metallurgy & Metallurgical Engineering
Darothi Bairagi, Partha Duley, Manas Paliwal, Sumantra Mandal
Summary: The mechanical and in-vitro corrosion behavior of Mg-4Zn-0.5Ca-0.8Mn alloy under optimum homogenized conditions were investigated. The optimization of homogenization parameters was achieved through thermodynamic calculations and kinetic modeling. The results showed that 6-24 h of homogenization at 633 K effectively redistributed the elements in the alloy, resulting in improved strength and corrosion resistance.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Tongtong Cao, Yong Zhu, Yuyang Gao, Yan Yang, Gang Zhou, Xiaofei Cui, Chen Wen, Bin Jiang, Xiaodong Peng, Fusheng Pan
Summary: The microstructure of the Mg-Li-Zn-Mn alloy was refined and precipitates were uniformly distributed through hot extrusion. The as-extruded alloy exhibited improved mechanical properties, including higher yield strength, ultimate tensile strength, and elongation. Both the as-extruded and as-cast alloys showed superior damping capacities.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yuanxiao Dai, MengHan Xiao, Yaobo Hu, Yan Yang, Bin Jiang, Tianxu Zheng, Li Dong, Baoqing Yang, Changyong Zheng
Summary: By designing extrusion parameters, the Mg-0.12Ca-0.08Ba alloy underwent grain refinement and texture control, resulting in the best performance of the extruded samples with different crystallographic orientations.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Chunming Wang, Luming Zeng, Wenlong Zhang, Fuqian Tang, Wucheng Ding, Sufen Xiao, Tongxiang Liang
Summary: The addition of minor cerium refines the microstructure, enhances the strength and ductility of the alloy, and improves its corrosion resistance.
MATERIALS CHARACTERIZATION
(2021)
Article
Metallurgy & Metallurgical Engineering
Yan-hui Liu, Ming-long Ma, Xing-gang LI, Yong-jun LI, Guo-liang Shi, Jia-wei Yuan, Kui Zhang
Summary: The evolution of microstructure and mechanical properties of Mg-6Zn-3Sn alloy during homogenization was studied using various techniques. The overburning and diffusion kinetics of the alloy were analyzed, and an optimized homogenization scheme was determined. The results showed that decomposition of Mg2Zn3 phase and precipitation of Mg2Sn phase occurred after single-stage homogenization. Overburning was observed when the homogenization temperature increased to 350°C. The suitable homogenization scheme for the alloy was found to be (335°C, 24 h) + (400°C, 6 h) double-stage homogenization. The hardness of the alloy decreased continuously during double-stage homogenization, while the mechanical properties initially increased and then decreased, which was attributed to solid solution of Zn and Sn atoms and precipitation of Mg2Sn phase.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Materials Science, Multidisciplinary
Ming Yuan, Chao He, Yan Song, Bin Lei, Xiaoying Qian, Zhihua Dong, Jun Zhao, Huabao Yang, Yanfu Chai, Bin Jiang, Fusheng Pan
Summary: The addition of zinc in as-extruded Mg-2Al-0.5Ca alloys was found to refine the grain size and weaken texture, leading to improved tensile strength and ductility. The alloy containing 0.6 wt.% Zn exhibited enhanced mechanical properties due to its fine and homogeneous grain microstructure, and weakened extrude direction-tilted texture. The in-plane anisotropic tensile properties of the Mg-2Al-0.5Ca-0.6Zn alloy showed little variation, with different strengths and elongation values.
Article
Engineering, Civil
Zahra Nasiri, Hamed Mirzadeh, Mahmoud Sarkari Khorrami, Massoud Emamy
Summary: The synergistic effects of partial replacement of Al with Ca, homogenization heat treatment, and hot extrusion on the microstructure and mechanical properties of Mg-(7-x)Al-xCa magnesium alloys were studied. Homogenization resulted in eutectic constituents spheroidization and tensile ductility improvement, while hot extrusion led to fragmentation and dispersion of particles, formation of fine microstructures, and profound enhancements of tensile properties. The extruded AX43 alloy showed significantly better product of strength and ductility compared to the as-cast counterpart.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Metallurgy & Metallurgical Engineering
Jingren Li, Aiyue Zhang, Hucheng Pan, Yuping Ren, Zhuoran Zeng, Qiuyan Huang, Changlin Yang, Lifeng Ma, Gaowu Qin
Summary: The study found that the extrusion speed of Mg-Ca binary alloys affects their microstructures and mechanical properties. Increasing extrusion speed leads to a decrease in yield strength, an increase in elongation, and changes in grain structure.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Crystallography
Ying-Long Zhou, Jie Liu, Dong-Mei Luo
Summary: This study investigated the microstructure, mechanical and thermal properties of Mg-0.5Ca-xZr alloys in order to evaluate their potential values in heat dissipation applications. The results showed that the increase of Zr content and the extrusion process improved the mechanical strength of the alloys but worsened their thermal performance. The alloys also exhibited an increase in thermal conductivity and mechanical strength with aging time due to the precipitation of Zr and compound Mg2Ca. The Mg-0.5Ca-0.5Zr alloy aged at 473 K for 48 h showed higher thermal conductivity and similar mechanical strength to commonly-used Mg alloys, suggesting its potential as a heat dissipation material.
Article
Materials Science, Multidisciplinary
Hongju Deng, Yan Yang, Minmin Li, Xiaoming Xiong, Guobing Wei, Weidong Xie, Bin Jiang, Xiaodong Peng, Fusheng Pan
Summary: In this study, Mg-6Li-4Zn-xMn alloys were prepared and extruded, with the addition of Mn showing significant improvements in mechanical properties. The alloy containing 1.2% Mn exhibited the best mechanical properties, with enhanced strength and resistance to grain growth during extrusion.
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Zhong-Zheng Jin, Xiao Ma, Min Zha, Kai Guan, Hui-Yuan Wang, Jian-Gang Ma, Yi-Chun Liu
Summary: A near-isotropic Mg-4.5Al-1.5Sn-0.5Ca-0.2Mn alloy with a low mechanical anisotropy and balanced combination of yield strength and ductility was developed, showing potential for various engineering applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yazhao Shen, Defu Li, Shengli Guo, Jiangtao Guo
Summary: This paper investigates the microstructure evolution and mechanical properties of Mg-10Li-3Al-3Zn-0.22Si alloy during heat treatment and analyzes the strengthening mechanism and fracture behavior. Results show that heat treatment can enhance the strength of the alloy, and the alloy exhibits excellent mechanical properties after being heat-treated at 573K and air cooled.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Yi-dan Fan, Kun-kun Deng, Cui-ju Wang, Kai-bo Nie, Quan-xin Shi
Summary: Pure titanium particles reinforced Mg-6Zn-0.2Ca magnesium matrix composites were successfully fabricated and their mechanical properties were studied. The results showed that the titanium particles promoted dynamic recrystallization of the matrix alloy, refining the size of MgZn2 phases and resulting in high yield strength and ultimate tensile strength in the composite. However, the work hardening rate of the composite decreased during plastic deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
J. H. Zhang, K. B. Nie, K. K. Deng, X. Z. Han, Z. D. Wang
Summary: The effect of adding trace elements of Nd to Mg-3Zn-0.5Zr alloy was studied. It was found that Nd content significantly influenced the composition and distribution of the second phase in the alloy. The introduction of Nd resulted in a decrease in grain size and grain boundary strengthening, as well as an increase in texture intensity. High strength alloys with low alloying content and traditional extrusion processes were obtained.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Ren Jie Dai, Kun Kun Deng, Cui Ju Wang, Kai Bo Nie, Guo Wei Zhang, Wei Liang
Summary: AE alloy and AS alloy were obtained by extrusion and solution treatment of Zn-rich aluminum alloy. AE alloy has fine grains and high precipitate content, while AS alloy has increased grain size and dissolved precipitates. Both alloys show improved mechanical properties, but AE alloy has higher work hardening capacity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Wei Li, Kaibo Nie, Zhilong Liu, Kunkun Deng, Yanan Li, Xili Tong
Summary: The addition of SiC nanowires affected the microstructure and mechanical properties of Mg-2Zn-0.1Y matrix composites under different hot extrusion parameters. Stengthening mechanism was analyzed and the results showed significant changes in grain size and volume fraction with variations in extrusion temperature and speed.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Xin Lv, Kun-Kun Deng, Cui-Ju Wang, Kai-Bo Nie, Quan-Xin Shi, Wei Liang
Summary: The addition of trace submicron SiC particles can promote the formation of lamellar (α+β) structure and improve the corrosion resistance of the alloy. However, the precipitation of granular β-Mg17Al12 phase with increased SiCp content leads to a gradual decrease in corrosion resistance.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Zedong Wang, Kaibo Nie, Kunkun Deng, Jungang Han
Summary: A low-alloyed Mg-2Zn-0.8Sr-0.2Ca matrix composite reinforced by TiC nano-particles was successfully prepared by semi-solid stirring under the assistance of ultrasonic, and then the as-cast composite was hot extruded. The finest grain size of similar to 0.30 mu m is obtained in the sample extruded at 200 degrees C and 0.1 mm/s. The ultra-high mechanical properties (ultimate tensile strength of 480.2 MPa, yield strength of 462 MPa) are obtained after extrusion at 200 degrees C with a rate of 0.1 mm/s. Among all strengthening mechanisms for the present composite, the grain refinement contributes the most to the increase in strength. A mixture of cleavage facets and dimples were observed in the fracture surfaces of three as-extruded nanocomposites, which explain a mix of brittle-ductile fracture way of the samples.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hongwei Li, Kaibo Nie, Zhilong Liu, An Yang, Kunkun Deng
Summary: TiCp/Mg-Al-Ca-Mn nanocomposites were produced through extrusion, which resulted in refined grains and changes in the second phase. The composites exhibited specific texture composition and their properties were influenced by the degree of dynamic recrystallization and precipitates. The nanocomposites showed excellent mechanical properties, which were enhanced by various strengthening mechanisms.
Article
Materials Science, Multidisciplinary
Shilei Wang, Kaibo Nie, An Yang, Kunkun Deng
Summary: The influence of different Ca/Al mass ratios on the microstructure, phase evolution, and mechanical properties of Mg-Al-Ca-Mn alloys was investigated. It was found that increasing the Ca/Al ratio led to the transformation of the secondary phases and refinement of the grain size. The secondary phases not only refined the grains but also hindered dislocation migration, resulting in the strengthening of the alloy.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Nanoscience & Nanotechnology
Mei-li Hou, Kun-kun Deng, Cui-ju Wang, Kai-bo Nie, Quan-xin Shi
Summary: The effects of the VR/VD ratio on the work hardening and softening behaviors of Mg-6Zn-1Gd-0.12Y alloy were studied. It was found that increasing the VR/VD ratio reduced the work hardening rate in stage III, while increasing it in stage IV. A low VR/VD ratio improved the work hardening rate in stage III, while a high VR/VD ratio improved it in stage IV. With an increased VR/VD ratio, the softening behavior of the alloy increased in stage III and decreased and then increased in stage IV.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Electrochemistry
Xin Lv, Kunkun Deng, Cuiju Wang, Kaibo Nie, Quanxin Shi, Haoyi Niu
Summary: Through immersion, electrochemical, and Mg-air battery tests on extruded AZ91 alloy and 0.5 μm SiCp (0.5 vol.%)/AZ91 composite, it is found that the introduction of submicron SiCp can reduce the corrosion rate and improve the discharge performance of the alloy. This improvement is attributed to the refined grains, precipitates, and weakened basal texture resulting from the addition of submicron SiCp. This study provides new ideas for achieving the synergistic improvement of corrosion resistance and discharge performance of magnesium alloy.
ELECTROCHIMICA ACTA
(2023)
Article
Materials Science, Composites
Li Zhang, Kun-kun Deng, Kai-bo Nie, Cui-ju Wang, Chao Xu, Quan-xin Shi
Summary: GFs/ZX50 (graphite flakes/Mg-5Zn-0.5Ca) composites were successfully fabricated by ultrasonic-assisted semi-solid stirring followed by extrusion process. The microstructure observation shows that hot extrusion effectively regulates the orientation of GFs. The GFs/ZX50 composites exhibit excellent thermal conductive property of -145.6-174.2 W/(m center dot K) and high yield strength of -386.8-407.8 MPa. The excellent strength-thermal conductivity synergy of the composites is mainly attributed to the highly orientated GFs, the clean Mg-graphite interface, the ultrafine grains, and the MgZn2 nano-precipitates.
COMPOSITES COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Quan-xin Shi, Cui-ju Wang, Kun-kun Deng, Yi-dan Fan, Kai-bo Nie, Wei- Wei-Liang
Summary: The present work investigates the impact of bimodal microstructure on the work hardening and softening behaviors of Mg-6Zn-1Gd-0.3Ca alloy. The study also discusses the grain refinement mechanism through EBSD analysis. The results reveal that the work hardening capacity of the alloy increases with the volume fraction of fine recrystallized grains due to increased dislocation storage rate caused by grain coarsening. The stress reduction value in the early stage of deformation is the highest for the alloy with fine recrystallized grains, providing a greater driving force for softening effect. However, the stress reduction values decrease with the increase of fine recrystallized grains in the later stage of deformation. Furthermore, the analysis indicates that dynamic recrystallization plays a significant role in the formation of fine recrystallized grains in the Mg-6Zn-1Gd-0.3Ca alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xin Lv, Kunkun Deng, Cuiju Wang, Kaibo Nie, Xiaogang Wang, Quanxin Shi
Summary: The effect of submicron SiCp content on the corrosion resistance of homogenized AZ91 alloy was investigated. The results showed that the addition of 0.5 vol.% submicron SiCp significantly improved the corrosion resistance, reducing the weightless corrosion rate from 4.44 mm/y to 0.68 mm/y. However, the corrosion resistance decreased with increasing submicron SiCp concentration.
MATERIALS TODAY COMMUNICATIONS
(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)