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Effects of Ni Content and Ball Milling Time on the Hydrogen Storage Thermodynamics and Kinetics Performances of La–Mg–Ni Ternary Alloys

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Acta Metallurgica Sinica(English Letters) 2019年第8期32卷 961-971页

作者： Zhen-Yang Li Sheng-Li Li ze-ming yuan Yang-Huan Zhang School of Materials Science and Engineering Shandong UniversityJinan 250061China Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China

The eifects of Ni content and ball milling time on the hydrogen storage thermodynamics and kinetics performances of asmilled La5Mg95-xNix(x=5,10,15)ternary alloys have been *** evolution of microstructure and phase of experimental alloys in the absorption/desorption process has been characterized by XRD,SEM and *** hydrogen storage kinetics and thermodynamics performances and PCI curves have been tested using the Sievert *** is found that the rising of Ni content remarkably improves the hydrogen storage kinetic performance,but reduces hydrogen storage *** with the increase in milling time,hydrogen desorption activation(Ea)value decreases firstly and then increases;the minimum value is 47.6 kJ/mol,and the corresponding milling time is 10 h for La5Mg85Ni10 *** for the thermodynamics properties,the hydrogenation enthalpy(△H)and hydrogenation entropy(△S)both decrease firstly and then increase with the rising of Ni content and milling *** composite La5Mg85Ni10 alloy milled for 10 h exhibits the best thermodynamics and kinetics performances,the lowest Ea of 47.6 kJ/mol,absorption of 5.4 wt.%within 5 min and desorption of 5.2 wt.%within 3 min at 360℃and the lowest△H and△S of 72.1 kJ/mol and 123.2 J/mol/K.

关键词： Hydrogen storage Mg-based alloys Thermodynamics and kinetics Ni content Milling time

A Survey on Human Performance Capture and Animation

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Journal of Computer Science & Technology 2017年第3期32卷 536-554页

作者： Shihong Xia Lin Gao Yu-Kun Lai ming-ze yuan Jinxiang Chai Advanced Computing Research Laboratory Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China School of Computer Science and Informatics Cardiff University Cardiff CF243AA U.K. University of Chinese Academy of Sciences Beijing 100049 China Department of Computer Science and Engineering Texas A&M University College Station Texas 77843-3112 U.S.A.

With the rapid development of computing technology, three-dimensional （3D） human body models and their dynamic motions are widely used in the digital entertainment industry. Human performance mainly involves human body shapes and motions. Key research problems in human performance animation include how to capture and analyze static geometric appearance and dynamic movement of human bodies, and how to simulate human body motions with physical effects. In this survey, according to the main research directions of human body performance capture and animation, we summarize recent advances in key research topics, namely human body surface reconstruction, motion capture and synthesis, as well as physics-based motion simulation, and further discuss future research problems and directions. We hope this will be helpful for readers to have a comprehensive understanding of human performance capture and animation.

关键词： human surface reconstruction body motion capture motion synthesis physics-based motion simulation

Hydrogen storage properties of La1-xPrxMgNi3.6Co0.4（x=0-0.4） alloys with annealing treatment

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Rare Metals 2019年第9期38卷 871-876页

作者： Ting-Ting Zhai Sheng Xu Tai Yang ze-ming yuan Yang-Huan Zhang Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China College of Science Northeastern UniversityShenyang 110819China

The as-cast RE-Mg-Ni-b ased AB2-type La1-xPrxMgNi3.6Co0.4(x=0-0.4)alloys were prepared by vacuum induction melting followed by annealing *** phase composition and structure were characterized by X-ray diffraction(XRD)and scanning electron microscope(SEM).The results show that LaMgNi4 and LaNi5 coexist in as-cast alloys,but only LaMgNi4 is detected in the annealed *** morphology of annealed alloys is more homogeneous than that of as-cast *** gaseous hydrogen storage and electrochemical properties were investigated by pressure-composition isotherm(P-C-T)and electrochemical *** P-C-T curves of annealed alloys show flatter and wider pressure plateaus corresponding to absorption/desorption pressure plateaus of LaMgNi4 *** the maximum hydrogen storage content of annealed alloys is lower than that of as-cast *** consideration of the electrochemical properties,the annealed La0.8Pr0.2MgNi3.6Co0.4alloy exhibits a maximum discharge capacity of354.2 mAh·g-1.

关键词： LaMgNi4 P-C-T Annealing treatment Hydrogen storage properties

Influence of annealing on microstructure and hydrogen storage properties of V48Fe12Ti15Cr25 alloy

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Journal of Iron and Steel Research International 2020年第2期27卷 217-227页

作者： Long Luo Xuan Bian Wen-yuan Wu ze-ming yuan Yong-zhi Li Ting-ting Zhai Feng Hu School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Analytical and Testing Center Inner Mongolia University of Science and Technology.Baotou 014010Inner MongoliaChina

V48Fe12Ti15Cr25 alloy was prepared using vacuum arc melting and was subsequently annealed for 10 h at 1273 *** effects of annealing on the hydrogen storage properties and microstructure of the V48Fe12Ti15Cr25 alloys were *** results indicated that the alloy consisted of main body-centered cubic,Ti-rich,and TiFe *** annealing,the kinetic properties of the alloy were improved but its hydrogen storage capacity was slightly *** kinetic mechanisms of the hydrogen absorption and desorption of the alloys were *** dehydrogenation enthalpy of the alloy was decreased by 2.57 kJ/mol after *** scanning calorimetry indicated that the hydride decomposition temperature of the annealed alloy was *** hydrogen desorption activation energies of the as-cast and annealed alloys were calculated to be 79.41 and 71.25 kJ/mol,*** results illustrated that annealing was a beneficial method of improving the kinetic and thermodynamic properties of the hydrogen absorption/desorption of the alloy.

关键词： V-based solid solution alloy Annealing Microstructure Hydrogen storage Kinetic mechanism

Properties of Mechanically Milled Nanocrystalline and Amorphous Mg–Y–Ni Electrode Alloys for Ni–MH Batteries

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Acta Metallurgica Sinica(English Letters) 2015年第7期28卷 826-836页

作者： Yang-Huan Zhang ze-ming yuan Tai Yang Zhong-Hui Hou Dong-Liang Zhao Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute

Nanocrystalline and amorphous Mg2Ni-type Mg20-xYxNi10（x = 0,1,2,3 and 4） electrode alloys were fabricated using mechanical *** effects of the Y content and milling time on the microstructures and electrochemical performances of the alloys were investigated in detail.X-ray diffraction and transmission electron microscopy analyses revealed that the substitution of Y for Mg yields an obvious change in the phase composition and micro morphology of the *** the Y content x ≤ 1,the substitution of Y for Mg does not change the major phase Mg2 Ni,but with a further increase in the Y content,the major phase of the alloys transforms into the YMg Ni4 YMg3 phase.A nanocrystalline and amorphous structure can be obtained by mechanical milling,and the amorphisation degree of the alloy visibly increases with increased milling *** measurements indicate that the discharge capacity of the alloys first increases and then decreases with increasing Y content and milling *** substitution of Y for Mg dramatically ameliorates the cycle stability of the as-milled alloys,and the mechanical milling more or less impairs the cycle stability of the ***,the high rate discharge ability,electrochemical impedance spectrum,Tafel polarisation curves and potential step measurements indicate that the electrochemical kinetic properties of the as-milled alloys first increase and then decrease with increasing Y content and milling time.

关键词： Mg2Ni-type alloy Y substitution for Mg Milling time Electrochemical performance

Structure and electrochemical characteristics of Mg–Ti–Ni-based electrode alloys synthesized by mechanical milling

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Journal of Iron and Steel Research International 2021年第10期28卷 1329-1340页

作者： Zhong-hui Hou Xin Wei Wei Zhang ze-ming yuan Hui Yong Qi-lu Ge Department of Functional Material Research Central Iron and Steel Research InstituteBeijing100081China Inner Mongolia University of Science and Technology Baotou014010Inner MongoliaChina

The vacuum induction melting was adopted to fabricating Mg_(50−x)Ti_(x)Ni_(45)Al_(3)Co_(2)(x=0,1,2,3,4 at.%)composites protected by the high-purity helium ***,the surface modification treatment of the as-cast alloys was carried out by mechanically coating *** amorphous and nanocrystalline Mg_(50−x)Ti_(x)Ni_(45)Al_(3)Co_(2)(x=0–4)+50 wt.%Ni hydrogen storing alloys as the negative materials in batteries were prepared through ball milling,and the influences of milling time and Ti dosage on the structure and electrochemical hydrogen storing behaviors of the corresponding samples were studied in *** electrochemical testing reveals that the as-milled alloys have excellent performances and can finish the electrochemical hydrogenation and dehydrogenation at indoor *** the first cycle without activation,the ball milling alloy obtains the maximum value of discharge *** capacity and cyclic steadiness of the composites conspicuously grow as Ti content and milling duration ***,the capacity retaining rate at 100th cycle and the discharge capacity of 30 h milling samples augment from 53%to 78%and from 435.2 to 567.2 mAh/g with changing Ti content from 0 to *** same performances of the alloy(x=4)are enhanced from 61%to 78%and from 379.9 to 567.2 mAh/g,respectively,with extending milling ***,high rate discharge ability,potential-step measurements,potentiodynamic polarization curves and electrochemical impedance spectrum manifest that the electrochemical kinetics properties can achieve significant amelioration as Ti content varies and milling duration is extended.

关键词： MgNi-based alloy Ti substitution of Mg Surface modification Mechanical milling Electrochemical performance

Structure and electrochemical hydrogen storage characteristics of nanocrystalline and amorphous MgNi-type alloy synthesized by mechanical milling

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Journal of Iron and Steel Research International 2020年第8期27卷 952-963页

作者： Yang-huan Zhang Wei Zhang ze-ming yuan Wen-gang Bu Yan Qi Shi-hai Guo Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China

Both element substitution and surface modification were utilized to enhance the electrochemical performances of Mg–Ni-based alloys. Nanocrystalline and amorphous -Mg1?xCexNi0.9Al0.1 (x?=?0–0.08)?+?50 wt.% Ni hydrogen storage alloys were synthesized through mechanical milling. The sample alloys show excellent activation property and have good electrochemi-cal hydrogenation and dehydrogenation property at normal temperature. The discharge capacity has a peak value with Ce content varying which is 461.6 mAh/g for 10-h milled alloy, while that of -Ce0.04 alloy augments from 352.6 to 536.9 mAh/g with milling time extending from 5 to 30 h. Cycle stability is conspicuously improved with Ce content and milling duration augment. To be specific, when cycle number is fixed at 100, the capacity retention rate augments from 41% to 72% after Ce dosage rising from 0 to 0.08 for the 10-h milled alloy and from 58% to 76% after milling duration extending from 5 to 30 h for -Ce0.06 alloy. Additionally, the electrochemical kinetics of the alloys own peak values with Ce proportion varying;however, they always rise with milling duration extending.

关键词： Mg–Ni-based alloy Ce replacing Mg Surface modification Mechanical milling Electrochemical performance

Research progress of TiFe-based hydrogen storage alloys

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Journal of Iron and Steel Research International 2022年第4期29卷 537-551页

作者： Yang-huan Zhang Chen Li ze-ming yuan Yan Qi Shi-hai Guo Dong-liang Zhao Department of Functional Material Research Central Iron and Steel Research Institute GroupBeijing 100081China Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina

After being activated,TiFe alloys are widely concerned for their high hydrogen storage density due to their large reversible absorption and desorption capacity of hydrogen at room temperature,low price,abundant resources,moderate hydride decomposition pressure,and good hydrogen absorption and desorption kinetic ***,TiFe alloys can be used as anode materials for secondary batteries,catalysts for hydrogenation,and storage media for thermal,solar,and wind energy,which has wide industrial application ***,TiFe alloys have disadvantages such as difficult activation,easy toxicity,and large *** review introduces the current research status and performance characteristics of TiFe-based hydrogen storage alloys,the phase structure,hydride phase structure,kinetic and thermodynamic models of TiFe alloys,as well as the application prospects of TiFe-based hydrogen storage alloys in practical production and the ways to improve their hydrogen storage performance,and presents the views on the future research priorities and development directions of TiFe-based hydrogen storage alloys.

关键词： Hydrogen storage TiFe alloy Metal hydride Phase structure Performance characterization Modified treatment

Electrochemical hydrogen storage behaviors of as-cast and spun RE-Mg-Ni-Co-Al-based AB2-type alloys applied to Ni-MH battery

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Rare Metals 2020年第2期39卷 181-192页

作者： Yang-Huan Zhang Gang Huang ze-ming yuan Shi-Hai Guo Yan Qi Dong-Liang Zhao Key Laboratory of Integrated Exploitation of Baiyun Obo MultiMetal Resources Inner Mongolia University of Science and TechnologyBaotou014010China Department of Functional Material Research Central Iron and Steel Research InstituteBeijing100081China

Preparation of La-Mg-Ni-Co-Al-based AB2-type alloys La0.8-xCe0.2YxMgNi3.4Co0.4Al0.1(x=0,0.05,0.10,0.15,0.20)was performed using melt spinning *** influences of spun rate and Y content on structures and electrochemical hydrogen storage characteristics were *** base phase LaMgNi4 and the lesser phase LaNis were detected by X-ray diffraction(XRD)and scanning electron microscope(SEM).The variations of spinning rate and Y content cause an obvious change in phase content,but without altering phase composition,namely,with spinning rate and Y content growing,LaMgNi4 phase content augments while LaNi5 content ***,melt spinning and the replacing La by Y refine the grains *** electrochemical tests show a favorable activation capability of the two kinds of alloys,and the maximum discharge capacities are achieved during the first *** capacity firstly increases and subsequently decreases with spinning rate rising,while cycle stability is ameliorated and discharge capacity decreases with Y addition *** is found that the amelioration of cycle stability is due to the enhancement of anti-pulverization,anti-corrosion and antioxidation abilities by both replacement of La with Y and melt ***,with the increase of Y addition and/or spinning rate,the electrochemical kinetics that contain charge transfer rate,limiting current density(IL),hydrogen diffusion coefficient(D)and the high rate discharge ability(HRD)firstly augment and then reduce.

关键词： Electrochemical characteristic AB2-type alloy Y substitution Melt spinning