检索结果-南通市图书馆

Purifying Fe-based amorphous alloys to enhance glass-forming ability by designing a novel refining slag

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第12期143卷 189-197页

作者： Shuai Mo Jing Zeng Hua Zhang Yinan Wu Tao Liu hongwei ni The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China The Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Wuhan Research Institute of Metallurgical Construction Ltd.MCCWuhan 430081China

Designing low melting point and low basicity refining slag suitable for Fe-based amorphous alloys and understanding the inclusions’formation,removal,influencing mechanisms are quite vital in the fields of metallurgy and materials.In this study,a novel 13%SiO_(2)-32%CaO-30%Al_(2)O_(3)-25%B_(2)O_(3)(wt.%)refining slag was designed after careful calculations of the liquid phase region,slag-metal equilibrium,surface tension,viscosity,deoxidation capability and sulfur distribution ratio.After refining with our designed slag,the content of impurities and the number density of inclusions in a representative Fe_(83)Si_(2)B_(15)(at.%)amor-phous alloy were significantly reduced.Moreover,the glass-forming ability(GFA)of the alloy was also enhanced,enabling the preparation of amorphous ribbons with a lower cooling rate.Based on the impu-rities in Fe-based amorphous alloys as well as the calculated oxide and sulfide free energy diagrams,CaO,SiO_(2),Al_(2)O_(3) oxides and CaS,TiS,MnS sulfides will form in the master alloy.The high melting point in-clusions in the melt are generally removed via a floatation-separation-absorption process and the Mn,Ti,S impurities are removed via slag-metal interface reactions during refining.As for the detrimental effect of inclusions on glass formation,the small lattice disregistry between Ti,Mn-containing inclusions and primaryα-Fe gains reveal that these inclusions are effective in promoting the heterogeneous nucleation,and therefore greatly deteriorate the GFA.These findings are important and provide an ideal solution to purifying the Fe-based amorphous alloys by refining and enhancing the GFA for industrial production.

关键词： Fe-based amorphous alloy Refining slag design Inclusion Lattice disregistry Heterogeneous nucleation

Clean production of Fe-based amorphous soft magnetic alloys via smelting reduction of high-phosphorus iron ore and apatite

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2023年第12期30卷 2356-2363页

作者： Hua Zhang Tuoxiao Wang Guoyang Zhang Wenjie Wu Long Zhao Tao Liu Shuai Mo hongwei ni The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China College of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005China

Separated preparation of prealloys and amorphous alloys results in severe solidification-remelting and beneficial element removal-readdition contradictions,which markedly increase energy consumption and emissions.This study offered a novel strategy for the direct production of FePC amorphous soft magnetic alloys via smelting reduction of high-phosphorus iron ore(HPIO)and apatite.First,the thermodynamic conditions and equilibrium states of the carbothermal reduction reactions in HPIO were calculated,and the element content in reduced alloys was theoretically determined.The phase and structural evolutions,as well as element migration and enrichment behaviors during the smelting reduction of HPIO and Ca_(3)(PO_(4))_(2),were then experimentally verified.The addition of Ca_(3)(PO_(4))_(2)in HPIO contributes to the enrichment of the P element in reduced alloys and the subsequent development of Fe_(3)P and Fe_(2)P phases.The content of P and C elements in the range of 1.52 wt% -14.63 wt% and 0.62 wt% -2.47 wt%,respectively,can be well tailored by adding 0-50 g Ca_(3)(PO_(4))_(2)and controlling the C/O mole ratio of 0.8-1.1,which is highly consistent with the calculated results.These FePC alloys were then successfully formed into amorphous ribbons and rods.The energy consumption of the proposed strategy was estimated to be 2.00×10^(8) kJ/t,which is reduced by 30% when compared with the conventional production process.These results are critical for the comprehensive utilization of mineral resources and pave the way for the clean production of Fe-based amorphous soft magnetic alloys.

关键词： high-phosphorus iron ore smelting reduction structural evolution Fe-based amorphous alloy clean production

Improving hydrogen storage thermodynamics and kinetics of Ce-Mg-ni-based alloy by mechanical milling with TiF_(3)

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第4期12卷 1593-1607页

作者： hongwei Shang Wei Zhang Xin Wei Yaqin Li Zeming Yuan Jun Li Yanghuan Zhang School of Mechanical and Electrical Engineering Chuzhou UniversityChuzhou 239000China Department of Functional Material Research Central Iron and Steel Research InstituteNo.76 Xueyuannan RoadHaidian DistrictBeijing 100081China Key Laboratory of Integrated Exploitation of Bayan-Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China China Rare Earth New Material(Weishan)Co. Ltd.Jining 277600China

Mg-based hydrides are too stable and the kinetics of hydrogen absorption and desorption is not satisfactory.An efficient way to improve these shortcomings is to employ reactive ball milling to synthesize the nanocomposite materials of Mg and additives.In this experiment,TiF_(3)was selected as an additive,and the mechanical milling method was employed to prepare the experimental alloys.The alloys used in this experiment were the as-cast Ce_(5)Mg_(85)ni_(10),as-milled Ce_(5)Mg_(85)ni_(10)and Ce_(5)Mg_(85)ni_(10)+3 wt.%TiF3.The phase transformation,structural evolution,isothermal and non-isothermal hydrogenation and dehydrogenation performances of the alloys were inspected by XRD,SEM,TEM,Sievert apparatus,DSC and TGA.It revealed that nanocrystalline appeared in the as-milled samples.Compared with the as-cast alloy,ball milling made the particle dimension and grain size decrease dramatically and the defect density increase significantly.The addition of TiF_(3)made the surface of ball milling alloy particles markedly coarser and more irregular.Ball milling and adding TiF_(3)distinctly improved the activation and kinetics of the alloys.Moreover,ball milling along with TiF_(3)can decrease the onset dehydrogenation temperature of Mg-based hydrides and slightly ameliorate their thermodynamics.

关键词： Mg-based hydrides TiF_(3) Ball milling Thermodynamics Kinetics

Bias distribution and regulation in photoelectrochemical overall water-splitting cells

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第4期11卷 141-150页

作者： Kun Dang Siqin Liu Lei Wu Daojian Tang Jing Xue Jiaming Wang hongwei Ji Chuncheng Chen Yuchao Zhang Jincai Zhao Key Laboratory of Photochemistry CAS ResearchEducation Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

The water oxidation half-reaction at anodes is always considered the rate-limiting step of overall water splitting（OWS）,but the actual bias distribution between photoanodes and cathodes of photoelectro chemical（PEC） OWS cells has not been investigated systematically.In this work,we find that,for PEC cells consisting of photoanodes（nickel-modified n-Si [ni/n-Si] and α-Fe2O3） with low photovoltage(Vph 1V,the bias required for cathode activation can be significantly reduced,exhibiting a kinetics-controlled characteristic.Further investigations show that the bias distribution can be regulated by tuning the electrolyte pH and using alternative half-reaction couplings.Accordingly,a volcano plot is presented for the rational design of the overall reactions and unbiased PEC cells.Motivated by this,an unbiased PEC cell consisting of a simple ni/n-Si photoanode and Pt cathode is assembled,delivering a photo current density of 5.3±0.2 mA cm-2.

关键词： photoelectrochemistry overall reaction cell bias distribution photoanode water splitting

Elastic Modulus,Hardness,and Fracture Toughness of Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12) Solid Electrolyte

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2021年第9期38卷 108-116页

作者： Shan Hu Pengyu Xu Luize Scalco de Vasconcelos Lia Stanciu hongwei ni Kejie Zhao State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China School of Mechanical Engineering Purdue UniversityWest LafayetteIndiana 47907USA School of Materials Engineering Purdue UniversityWest LafayetteIndiana 47907USA

Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO) is a promising inorganic solid electrolyte due to its high Li+conductivity and electrochemical stability for all-solid-state batteries.Mechanical characterization of LLZTO is limited by the synthesis of the condensed phase.Here we systematically measure the elastic modules,hardness,and fracture toughness of LLZTO poly crystalline pellets of different densities using the customized environmental nanoindentation.The LLZTO samples are sintered using the hot-pressing method with different amounts of Li2CO3 additives,resulting in the relative density of the pellets varying from 83% to 98% and the largest grain size of 13.21 ± 5.22 μm.The mechanical properties show a monotonic increase as the sintered sample densifies,elastic modulus and hardness reach 158.47± 10.10 GPa and 11.27± 1.38 GPa,respectively,for LLZTO of 98% density.Similarly,fracture toughness increases from 0.44 to 1.51 MPa·m^(1/2),showing a transition from the intergranular to transgranular fracture behavior as the pellet density increases.The ionic conductivity reaches 4.54 × 10^(-4 )S/cm in the condensed LLZTO which enables a stable Li plating/stripping in a symmetric solid-state cell for over 100 cycles.This study puts forward a quantitative study of the mechanical behavior of LLZTO of different microstructures that is relevant to the mechanical stability and electrochemical performance of all-solid-state batteries.

关键词： toughness Elastic Solid

Exploring the role of iron in Fe_(5)ni_(4)S_(8)toward oxygen evolution through modulation of electronic orbital occupancy

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第5期92卷 52-62页

作者： Zhengyan Du Zeshuo Meng Haoteng Sun Yifan Li Chao Jiang Yaxin Li Xiaoying Hu Yi Cui Shansheng Yu hongwei Tian Key Laboratory of Automobile Materials of MOE School of Materials Science and EngineeringJilin UniversityChangchun 130012JilinChina College of Science and Laboratory of Materials Design and Quantum Simulation Changchun UniversityChangchun 130022JilinChina i-lab Vacuum Interconnected Nanotech Workstation(Nano-X)Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina Department of Chemistry Brown UniversityRI 02912United States

ni-Fe-based catalysts are considered to be among the most active catalysts for the oxygen evolution reaction(OER)under alkaline conditions,with Fe playing a crucial role.However,Fe leaching occurs during the reaction due to thermodynamic instability,which has resulted in conflicting reports within the literature regarding its role.To clarify this point,we propose a strategy consisting of modulating the electronic orbital occupancy to suppress the extensive loss of Fe atoms during the OER process.Theoretical calculations,in-situ X-ray photoelectron spectroscopy,molecular dynamics simulations,and a series of characterization showed that the stable presence of Fe not only accelerates the electron transfer process but also optimizes the reaction barriers of the oxygen evolution intermediates,promoting the phase transition of Fe_(5)ni_(4)S_(8)to highly active catalytic species.The modulated Fe_(5)ni_(4)S_(8)-based pre-catalysts exhibit improved OER activity and long-term durability.This study provides a novel perspective for understanding the role of Fe in the OER process.

关键词： Oxygenevolution Fe_(5)ni_(4)S_(8) Electronic orbital occupancy modulation Reconstruction dynamics

Heterostructured crystallization mechanism and its effect on enlarging the processing window of Fe-based nanocrystalline alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第9期68卷 53-60页

作者： Tao Liu Aina He Fengyu Kong Anding Wang Yaqiang Dong Hua Zhang Xinmin Wang hongwei ni Yong Yang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081China GAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong Kong Special Administrative RegionChina

The harsh melt-spinning and annealing processes of high saturation magnetization nanocrystalline softmagnetic alloys are the biggest obstacles for their industrialization. Here, we proposed a novel strategy to enlarge the processing window by annealing the partially crystallized precursor ribbons via a heterostructured crystallization process. The heterostructured evolution of Fe_(84.75)Si_(2)B_(9)P_(3)_(C0.5)Cu_(0.75)(at.%)alloy ribbons with different spinning rate were studied in detail, to demonstrate the gradient nucleation and grain refinement mechanisms. The nanocrystalline alloys made with industrially acceptable spinning rate of 25-30 m/s and normal annealing process exhibit excellent magnetic properties and fine nanostructure. The small quenched-in crystals/clusters in the free surface of the low spinning rate ribbons will not grow to coarse grains, because of the competitive grain growth and shielding effect of metalloid elements rich interlayer with a high stability. Avoiding the precipitation of quenched-in coarse grains in precursor ribbons is thus a new criterion for the composition and process design, which is more convenient than the former one with respect to the homogenous crystallization mechanism, and enable us to produce high performance nanocrystalline soft-magnetic alloys. This strategy is also suitable for improving the compositional adjustability, impurity tolerance, and enlarging the window of melt temperature,which is an important reference for the future development of composition and process.

关键词： Nanocrystalline alloy Processing window Surface crystallization Soft-magnetic property Heterostructured crystallization

Dynamic active sites on plasma engraved ni hydroxide for enhanced electro-catalytic urea oxidation

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第8期31卷 150-158,I0005页

作者： Dan Li Yuefeng Zhang Xiaomin Zhou Chao Huang Ying Wen Liangliang Liu Qingwei Li Yue Xu Yuzheng Wu Qingdong Ruan Yinghe Ma Fangyu Xiong Dezhi Xiao Pei Liu Guomin Wang Babak Mehrjou Bin Wang Hao Li Rongsheng Chen hongwei ni Zhiyuan Zeng Paul K.Chu Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloon 999077Hong KongChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Catalysis Theory Center Department of PhysicsTechnical University of Denmark2800 Kongens LyngbyDenmark

The urea oxidization reaction(UOR)is an important anodic reaction in electro-catalytic energy conversion.However,the sluggish reaction kinetics and complex catalyst transformation in electrocatalysis require activity improvement and better mechanistic understanding of the state-of-the-art ni(OH)_(2) catalyst.Herein,by utilizing low-temperature argon(Ar)plasma processing,tooth-wheel ni(OH)_(2) nanosheets self-supported on ni foam(ni(OH)_(2)-Ar)are demonstrated to have improved UOR activity compared to conventional ni(OH)_(2).The theoretical assessment confirms that the edge has a smaller cation vacancy formation energy than the basal plane,consequently explaining the structural formation.Operando and quasi-operando methods are employed to investigate the dynamic evolution of the ni(OH)_(2) film in UOR.The crucial dehydrogenation products of ni(OH)_(5)O^(-)intermediates are identified to be stable on the etched edge and explain the enhanced UOR in the low potential region.In addition,the dynamic active sites are monitored to elucidate the reaction mechanism in different potential ranges.

关键词： Urea oxidization reaction ni hydroxide Plasma processing Dehydrogenation Active site

激光增材制造316L不锈钢力学性能的各向异性

在线全文

学校读者我要写书评

暂无评论

钢铁 2024年第6期59卷 155-165页

作者：刘伟刘成松王勇张华倪红卫武汉科技大学省部共建耐火材料与冶金国家重点实验室武汉科技大学钢铁冶金与资源利用教育部重点实验室

相比于传统制造工艺生产的316L不锈钢零件，L-PBF技术具有更大的设计自由度和制造效率，可实现复杂几何形状金属零件的一次性成型，被广泛应用在核工业、汽车工业以及医疗卫生等领域。然而，L-PBF技术极快的冷却速率会导致其内部形成明... 详细信息

相比于传统制造工艺生产的316L不锈钢零件，L-PBF技术具有更大的设计自由度和制造效率，可实现复杂几何形状金属零件的一次性成型，被广泛应用在核工业、汽车工业以及医疗卫生等领域。然而，L-PBF技术极快的冷却速率会导致其内部形成明显差异的微观组织结构，从而造成材料力学性能的各向异性。利用SEM、EBSD和TEM等表征技术，深入观察了L-PBF 316L不锈钢样品不同截面的微观组织的差异，从晶粒尺寸、晶体取向以及亚晶结构的变形机理3方面详细分析了其对材料力学性能的影响。研究表明，垂直于打印方向的晶体为明显的织构，晶粒尺寸较小，且塑性变形时网络状的胞状亚晶和变形孪晶相互作用，形成了更小尺寸的三维立体钉扎结构，可有效抑制各个方向的位错滑移，明显增加了该方向的强度。然而，平行于打印方向为较粗大的柱状晶，晶体取向趋于随机，并且亚晶结构多为条状形貌。塑性变形时，当变形孪晶生长方向平行于亚晶的长边时，则无法对条状亚晶进行分割和细化，进而不能有效抑制平行于亚晶长边界的位错滑移，强化效果较弱，导致该方向强度较低。研究有利于更好地理解L-PBF 316L中各向异性的起源，为后续热处理提供了理论指导；同时有助于拓扑优化、晶格结构建模和增材制造过程中的热物理过程模拟等工作的模型搭建，提高模型的精度。

关键词： 316L不锈钢激光粉末床熔融技术晶体特征亚晶结构各向异性