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Highly ameliorated gaseous and electrochemical hydrogen storage dynamics of nanocrystalline and amorphous LaMg_(12)-type alloys prepared by mechanical milling

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Journal of Iron and Steel Research International 2017年第1期24卷 50-58页

作者： Dian-chen Feng Hao Sun Zhong-hui Hou Dong-liang Zhao Xi-tao Wang Yang-huan Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing School of Materials and Metallurgy Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute

Nanocrystalline and amorphous LaMg12-type alloy-Ni composites with a nominal composition of LaMg11Ni＋x wt.% Ni（x=100,200）were synthesized via ball *** influences of ball milling duration and Ni adding amount xon the gaseous and electrochemical hydrogen storage dynamics of the alloys were systematically *** hydrogen storage performances were studied by a differential scanning calorimeter and a Sievert *** dehydrogenation activation energy of the alloy hydrides was evaluated by Kissinger *** electrochemical hydrogen storage dynamics of the alloys was investigated by an automatic galvanostatic *** H atom diffusion and apparent activation enthalpy of the alloys were *** results demonstrate that a variation in Ni content remarkably enhances the gaseous and electrochemical hydrogen storage dynamics performance of the *** gaseous hydriding rate and high-rate discharge（HRD）ability of the alloys exhibit maximum values with varying milling ***,the dehydriding kinetics of the alloys is always accelerated by prolonging milling ***,rising milling time from 5to 60 h makes the hydrogen desorption ratio（a ratio of the dehydrogenation amount in 20 min to the saturated hydrogenation amount）increase from 57%to 66%for x=100alloy and from 57%to 70%for x=***,the improvement of gaseous hydrogen storage kinetics is attributed to the descending of dehydrogenation activation energy caused by the prolonging of milling duration and growing of Ni content.

关键词： mechanical milling Hydrogen storage Electrochemical performance Kinetics Activation energy

Hydrogen storage thermodynamics and dynamics of La-Mg-Ni-based LaMg12-type alloys synthesized by mechanical milling

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Rare Metals 2019年第12期38卷 1144-1152页

作者： Yang-Huan Zhang Peng-Fei Gong Long-Wen Li Hao Sun Dian-Chen Feng Shi-Hai Guo Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China

Nanocrystalline/amorphous LaMg(12)-type alloyNi composites with a nominal composition of LaMg(11)Ni+x wt% Ni(x=100,200) were synthesized by mechanical *** of Ni content and milling time on the gaseous hydrogen storage thermodynamics and dynamics of alloys were systematically *** hydrogen desorption properties were studied by Sievert apparatus and a differential scanning calorimeter(DSC).Thermodynamic parameters(△H and ΔS) for the hydrogen absorption and desorption of alloys were calculated by Van't Hoff *** desorption activation energy of alloy hydride was estimated by Arrhenius and Kissinger *** increase in Ni content has a slight effect on the thermodynamic properties of alloys,but it significantly enhances the hydrogen absorption and desorption kinetics performance of ***,variation of milling time clearly affects the hydrogen storage properties of *** absorption capacity(C(100)~a) and hydrogen absorption saturation ratio(R(10)~a)(a ratio of the hydrogen absorption capacity at 10 min to the saturated hydrogen absorption capacity) have maximum values with milling time *** hydrogen desorption ratio(R(20)~d)(a ratio of the hydrogen desorption capacity at 20 min to the saturated hydrogen absorption capacity) always increases with milling time ***,prolonging milling time from 5 to 60 h makes R(20)~d increase from 10.89% to 16.36% for the x=100 alloy and from 13.93% to 21.68% for the x=200 alloy,respectively.

关键词： LaMg(12)alloy mechanical milling Thermodynamics and dynamics Activation energy Hydrogen storage

Structural Evolution During mechanical milling of Bimodal-Sized Al_2O_3 Particles Reinforced Aluminum Matrix Composite

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Acta Metallurgica Sinica(English Letters) 2018年第4期31卷 423-430页

作者： Ke Zhao Dan Tang Jin-Ling Liu Yi-Guang Wang Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical University State Key Laboratory of Traction Power School of Mechanics and Engineering Southwest Jiaotong University Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province Southwest Jiaotong University

Hybrid aluminum matrix composite powders reinforced with bimodal-sized Al2O3 particles were synthesized by mechanical *** different approaches were investigated for the addition of submicron-and nano-sized Al2O3 particles to the aluminum powders,It was observed that the simultaneous addition of bimodal-sized Al2O3 particles to the aluminum powders resulted in an equiaxed morphology of the composite powders and the average particle size stabilized after 5 h of milling,indicating that the presence of bimodal-sized particles has greater effect on accelerating milling process as compared to nano-sized particles;the grain size of the aluminum matrix in composite powders was reduced to under 40 nm,approximate to the value obtained in the separate addition case,while a lower rate of refining was observed due to hindrance of submicron-sized particles on the interactions between nano-sized particles and the aluminum matrix.

关键词： Bimodal-sized Aluminum matrix composite mechanical milling Grain refinement

Gaseous hydrogen storage thermodynamics and kinetics of RE-Mg-Ni-based alloys prepared by mechanical milling

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Journal of Central South University 2017年第4期24卷 773-781页

作者： ZHANG Yang-huan YUAN Ze-ming YANG Tai BU Wen-gang HOU Zhong-hui ZHAO Dong-liang 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/amorphous La Mg11Ni+x Ni(x=100%, 200%, mass fraction) composite hydrogen storage alloys were synthesized by ball milling technology. The effects of Ni content and milling time on the gaseous hydrogen storage thermodynamics and dynamics of the alloys were systematically investigated. The hydrogen desorption properties were studied by Sievert's apparatus and a differential scanning calorimeter(DSC) connected with a H2 detector. The thermodynamic parameters(ΔH and ΔS) for the hydrogen absorption and desorption of the alloys were calculated by Van't Hoff equation. The hydrogen desorption activation energy of the alloy hydride was estimated using Arrhenius and Kissinger methods. The results indicate that a variation in the Ni content has a slight effect on the thermodynamic properties of the alloys, but it significantly improves their absorption and desorption kinetics performances. Furthermore, varying milling time clearly affects the hydrogen storage properties of the alloys. All the as-milled alloys show so fast hydrogen absorption rate that the absorbed amount in 10 min reaches to at least more than 95% of the saturated hydrogen absorption capacity. Moreover, the improvement of the gaseous hydrogen storage kinetics of the alloys is found to be ascribed to a decrease in the hydrogen desorption activation energy caused by increasing Ni content and prolong milling time.

关键词： hydrogen storage mechanical milling activation energy kinetics

mechanical and wear properties of Al-Al_3Mg_2 nanocomposites prepared by mechanical milling and hot pressing

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International Journal of Minerals,Metallurgy and Materials 2013年第3期20卷 290-297页

作者： A. Zolriasatein R.A. Khosroshahi M. Emamy N. Nemati Faculty of Materials Engineering Sahand University of Technology Center of Excellence for High Performance Materials School of Metallurgy and Materials University of Tehran

β-A13Mg2 intermetallic was used as a reinforcing agent to improve the mechanical properties of an aluminum matrix. Different amounts of A13Mg2 nanoparticles （ranging from 0wt% to 20wt%） were milled with aluminum powders in a planetary ball mill for 10 h. Consolidation was conducted by uniaxial pressing at 400β under a pressure of 600 MPa for 2 h. Microstructural characterization confirms the uniform distribution of A13Mg2 nanoparticles within the matrix. The effects of nano-sized A13Mg2 content on the wear and mechanical properties of the composites were also investigated. The results show that as the A13Mg2 content increases to higher levels, the hardness, compressive strength, and wear resistance of the nanocomposites increase significantly, whereas the relative density and ductility decrease. Scanning electron microscopy （SEM） analysis of worn surfaces reveals that a transition in wear mechanisms occurs from delamination to abrasive wear by the addition of A13Mg2 nanoparticles to the matrix.

关键词： nanocomposites intermetallics mechanical milling hot pressing wear compressive strength hardness

Effect of process parameter on the flowability of nanocrystalline CoNiCrAlY powder synthesized by mechanical milling

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Particuology 2024年第9期92卷 210-223页

作者： Annadaa Shankara Dash Indranil Manna Deepa Devapal Sharad Chandra Sharma Jyotsna Dutta Majumdar School of Nanoscience and Technology IIT KharagpurWest BengalIndia BIT Mesra RanchiJharkhandIndia Department of Metallurgical and Materials Engineering IIT KharagpurWest BengalIndia Vikram Sarabhai Space Centre ThiruvanthapuramKeralaIndia

The present study concerns understanding the effect of process parameters on the characteristics and flowability of nanocrystalline CoNiCrAlY powder synthesized by mechanical *** milling has been conducted in a planetary ball mill with tungsten carbide(WC)ball,with ball to powder ratio of 10:1 at 300 rpm speed,using 1%stearic acid and toluene as process control agent(PCA)with time varying from 10 h to 36 *** synthesized nanocrystalline powder were characterized by Scanning Electron Microscopy,X-ray Diffraction technique,X-ray Photoelectron Spectroscopy,and Differential Scanning ***,flowability in terms of Hausner ratio was assessed by Tap Density *** particle size of the powder was found to decrease from 33μm to 22μm after 10 h of milling and further increases to 43μm and 38μm after 25 and 36 h of milling,respectively,in stearic acid ***,in toluene medium particle size continuously decreases from 33μm to 9.7μm with increasing milling *** particle morphology changes from spherical to platelet shape at low milling hours in both of the *** 25 h of milling,the shape of the particles is nearly spherical for stearic acid and irregular for toluene used as a *** size was found to decrease with increasing milling time from 147 nm to 7.7 nm and to 6.4 nm in stearic acid and toluene media,*** was presence ofγ,γʹ,β,hcp-Co,Al_(2)O_(3)and AlOOH phases on the powder particles milled in both the *** measured Hausner ratio of the powders was found to vary from 1.18 to 1.32 in stearic acid medium,and was found to increase with increasing milling *** the other hand,in toluene media flowability decreases(Hausner ratio increases from 1.33 to 1.44)with increasing milling time.

关键词： mechanical milling Microstructure Process control agent(PCA) CoNiCrAlY Toluene Stearic acid Flowability

Structure and electrochemical hydrogen storage behaviors of Mg-Ce-Ni-Al-based alloys prepared by mechanical milling

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Journal of Rare Earths 2020年第10期38卷 1093-1102,I0003页

作者： Yanghuan Zhang Pengpeng Wang Wei Zhang Wengang Bu Yan Qi Shihai Guo 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 influences of milling time and Ce content on the electrochemical property and micro structure of asmilled Mg1-xCexNi0.9Al0.1(x=0,0.02,0.04,0.06,0.08)+50 wt%Ni alloys were investigated *** as-milled alloys have an outstanding activation *** cycle stability conspicuously grows up with milling time and Ce proportion *** capacity retention rate at 100 th cycle of x=0.02 alloy augments from 47% to 63% when prolonging milling time from 5 to 30 h and it grows from55% to 82% for the 30 h milled alloy with Ce content growing from 0 to *** discharge capacity of x=0.02 alloy grows up invariably with milling time prolonging,while that of the 30 h milled alloys has the maximal value of 578.4 mAh/g with Ce content ***,the electrochemical kinetic properties of alloys significantly improve with milling duration extending,while they have the maximal values with Ce proportion varying.

关键词： Mg-based alloy Ce substituting Mg mechanical milling Electrochemical property Rare earths

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 Ce-Mg-Ni-based alloys synthesized by mechanical milling

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Journal of Rare Earths 2017年第3期35卷 280-289页

作者：张羊换冯佃臣孙昊卜文刚祁焱郭世海 College of Material and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China Department of Functional Material Research Central Iron and Steel Research InstituteBeijing 100081China School of Materials University of Science and Technology BeijingBeijing 100083China

The substituting Mg with Ni and milling as-cast alloy with Ni were adopted to obtain nanocrystalline/amorphous CeMgnNi＋x wt.%Ni（x=100,200） alloys and promote the electrochemical hydrogen storage performances of CeMg_（12）-type *** the structural features of the alloys provided a mechanism for ameliorating the electrochemical hydrogen storage *** electrochemical tests demonstrated that all the alloys just needed one cycle to be *** Ni proportion had an obvious role on charge-discharge *** discharge capacities of the as-milled（60 h） alloys increased sharply from 182.0 mAh/gfor x=100 alloy to 1010.2 mAh/gfor x=200 alloy at current density of 60 mAh/***,milling time largely determined the performances of electrochemical *** discharge capacity continued to grow along with prolonging milling time,while the cycle stability obviously decreased for x=100 alloy,and first declined and then augmented for the x=200 alloy with milling time *** addition,there was an optimal value with milling time varying for the high rate discharge abilities（HRD）,which was 80.3%for x=100 alloys and 86.73%for x=200,respectively.

关键词： CeMg12-type alloy mechanical milling nanocrystalline and amorphous electrochemical hydrogen storage performance rare earths