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Journal of Rare Earths 2019年第12期37卷 1305-1311页

作者： Yiming Li Zhuocheng Liu Guofang Zhang Yanghuan Zhang huiping ren Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and Technology

La-Mg-Ni alloys were prepared by melt-spinning with different cooling rates and followed by *** of the cooling rate leads to refinement of the grains size and increasing of the abundance of *** is favorable to formation of the A2 B7-type phase and promotes the discharge capacity,cycling stability and high rate discharge ability of the as-spun *** constitution of the annealed alloys is found to be closely related to the microstructure of the as-spun alloys.A single phase A2 B7-type microstructure is obtained in the annealed alloy which is attributed to the lower abundance of the LaNis of the original alloy spun with lower cooling *** of the single phase A2 B7-type microstructure is also ascribed to the isolated and homogeneous distribution of the morphology of the as-spun *** single phase alloy presents higher discharge capacity and better cycling stability compared with other annealed alloys.

关键词： La-Mg-Ni electrode alloys Melt-spinning Annealing Single phase microstructure Electrochemical properties Rare earths

Electrochemical hydrogen storage characteristics of La_(0.75-x) M_xMg_(0.25)Ni_(3.2)Co_(0.2)Al_(0.1)(M=Zr,Pr;x=0,0.1) alloys prepared by melt spinning

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Rare Metals 2012年第5期31卷 -页

作者： ZHANG Yanghuan YANG Tai CAI Ying HOU Zhonghui ren huiping ZHAO Dongliang Key Laboratory of Integrated Exploitation of Baiyun Obo Mutti-Metal Resources Inner Mongolia University of Science and Technology Baotou 014010 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China

In order to ameliorate the electrochemical hydrogen storage performances of La-Mg–Ni system A_2B_7-type electrode alloys, the partial substitution of M (M = Zr, Pr) for La was performed. The melt spinning technology was used to fabricate the La_(0.75-x)M_xMg_0.25Ni_3.2Co_0.2Al_0.1 (M = Zr, Pr; x = 0, 0.1) electrode alloys. The influences of the melt spinning and substituting La with M (M = Zr, Pr) on the structures and the electrochemical hydrogen storage characteristics of the alloys were investigated. The analysis of XRD, SEM, and TEM reveals that the as-cast and spun alloys have a multiphase structure composed of two main phases (La, Mg)_2Ni_7 and LaNi_5 as well as a residual phase LaNi_2 . The as-spun (M = Pr) alloy displays an entire nanocrystalline structure, while an amorphous-like structure is detected in the as-spun (M = Zr) alloy, implying that the substitution of Zr for La facilitates the amorphous formation. The electrochemical measurements exhibit that the substitution of Pr for La clearly increases the discharge capacity of the alloys; however, the Zr substitution brings on an adverse impact. Meanwhile, the M (M = Zr, Pr) substitution significantly enhances its cycle stability. The melt spinning exerts an evident effect on the electrochemical performances of the alloys, whose discharge capacity and high rate discharge ability (HRD) first mount up and then fall with the growing spinning rate, whereas their cycle stabilities monotonously augment as the spinning rate increases.

关键词： A_2B_7-type electrode alloy element substitution melt spinning electrochemical performance

Catalytic effect comparison of TiO_(2) and La_(2)O_(3) on hydrogen storage thermodynamics and kinetics of the as-milled La-Sm-Mg-Ni-based alloy

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Journal of Magnesium and Alloys 2021年第6期9卷 2063-2077页

作者： Yanghuan Zhang Xin Wei Wei Zhang Zeming Yuan Jinliang Gao huiping ren Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyNo.7 Aerding RoadKun DistrictBaotou 014010China Department of Functional Material Research Central Iron and Steel Research InstituteNo.76 Xueyuannan RoadHaidian DistrictBeijing 100081China Weishan Cisri-Rare Earth Materials Co. Ltd.Jining 277600China

In this investigation,mechanical grinding was applied to fabricating the Mg-based alloys La_(7)Sm_(3)Mg_(80)Ni_(10)+5 wt.%M(M=None,TiO_(2),La_(2)O_(3))(named La_(7)Sm_(3)Mg_(80)Ni_(10)-5 M(M=None,TiO_(2),La_(2)O_(3))).The result reveals that the structures of as-milled alloys consist of amorphous and *** particle sizes of the added M(M=TiO_(2),La_(2)O_(3))alloys obviously diminish in comparison with the M=None specimen,suggesting that the catalysts TiO_(2)and La_(2)O_(3)can enhance the grinding ***’s more,the additives TiO_(2)and La_(2)O_(3)observably improve the activation performance and reaction kinetics of the *** time required by releasing 3 wt.%hydrogen at553,573 and 593 K is 988,553 and 419 s for the M=None sample,and 578,352 and 286 s for the M=TiO_(2)composite,and 594,366,301 s for the La_(2)O_(3)containing alloy,*** absolute value of hydrogenation enthalpy change|△H|of the M(M=None,TiO_(2),La_(2)O_(3))alloys is 77.13,74.28 and 75.28 kJ/***,the addition of catalysts reduces the hydrogen desorption activation energy(E_(a)^(de)).

关键词： Mg-based alloy Ball milling Catalysts Hydrogen storage kinetics

Effects of substituting Ni with M (M=Cu, Al and Mn) on microstructures and electrochemical characteristics of La-Mg-Ni system (PuNi_3-type) electrode alloys

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Rare Metals 2006年第z1期25卷 25-32页

作者： ZHANG Yanghuan ZHAO Dongliang DONG Xiaoping ren huiping GUO Shihai WANG Xinlin Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China School of Material Inner Mongolia University of Science and Technology Baotou 014010 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China School of Material University of Science and Technology Beijing Beijing 100083 China School of Material Inner Mongolia University of Science and Technology Baotou 014010 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China

In order to improve the electrochemical cycle stability of La-Mg-Ni system (PuNi3-type) hydrogen storage alloy, Ni in the alloys was partially substituted by M (M=Cu, Al, Mn). A new La-Mg-Ni system electrode alloys La0.7Mg0.3Ni2.55-xCo0.45Mx (M=Cu, Al, Mn; x=0, 0.1) were prepared by casting and rapid quenching. The effects of element substitution and rapid quenching on the microstructures and electrochemical performances of the alloys were investigated. The results by XRD, SEM and TEM show that the alloys have a multiphase structure, including the (La, Mg)Ni3 phase, the LaNi5 phase and the LaNi2 phase. The rapid quenching and element substitution have an imperceptible influence on the phase compositions of the alloys, but both change the phase abundance of the alloys. The rapid quenching significantly improves the composition homogeneity of the alloys and markedly decreases the grain size of the alloys. The Cu substitution promotes the formation of an amorphous phase in the as-quenched alloy, and a reversal result by the Al substitution. The electrochemical measurement indicates that the element substitution decreases the discharge capacity of the alloys, whereas it obviously improves the cycle stability of the alloys. The positive influence of element substitution on the cycle life of the alloys is in sequence Al>Cu>Mn, and negative influence on the discharge capacity is in sequence Al>Mn>Cu. The rapid quenching significantly enhances the cycle stability of the alloys, but it leads to a different extent decrease of the discharge capacity of the alloys.

关键词： element substitution rapid quenching La-Mg-Ni system electrode alloy microstructures electrochemical performances

Highly Improved Gaseous Hydrogen Storage Characteristics of the Nanocrystalline and Amorphous Nd-Cu-added Mg_2Ni-type Alloys by Melt Spinning

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Journal of Materials Science & Technology 2014年第10期30卷 1020-1026页

作者： Yanghuan Zhang Tingting Zhai Baowei Li huiping ren Wengang Bu Dongliang 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

The nanocrystalline and amorphous Mg-Nd-Ni-Cu quaternary alloys with a composition of （Mg24Ni10Cu2）loo-xNdx （x = 0-20） were prepared by melt spinning. The X-ray diffraction and transmission electron microscopy inspections reveal that, by varying the spinning rate and the Nd content, different microstructures could be obtained by melt spinning. Particularly, the as-spun Nd-free alloy holds an entire nanocrystalline structure but the as-spun Nd-added alloy has a nanocrystalline and amorphous structure, which implies that the addition of Nd facilitates the glass forming in the Mg2Ni-type alloy. Also, the degree of the amorphization in the as-spun Nd-added alloys clearly increases with increasing the spinning rate and the Nd content. The H-storage capacity and the hydrogenation kinetics of amorphous, partially and completely nanocrystalline alloys were investigated and it was found that they are dependent on the microstructure and the phase composition of the alloys. Specially, enhancing the spinning rate from 0 （the as-cast was defined as the spinning rate of 0 m/s） to 40 m/s makes the hydrogen absorption saturation ratio （R5a）（a ratio of the hydrogen absorption quantity in 5 min to the saturated hydrogen absorption capacity） increase from 35.2% to 90.3% and the hydrogen desorption ratio （R10d）（a ratio of the hydrogen desorption quantity in 10 min to the saturated hydrogen absorption capacity） rise from 12.7% to 44.9% for the （x = 5） alloy. And the growing of the Nd content from 0 to 20 gives rise to the R5a and R10d values rising from 85.7% to 94.5% and from 36.7% to 54.8% for the as-spun （30 m/s） alloys, respectively.

关键词： Mg2Ni-type alloy Nd addition Melt spinning Structures Hydrogen storage

Electrochemical Hydrogen Storage Performances of the Si Added La-Mg-Ni-based A_2B_7-type Electrode Alloys for Ni/MH Battery Application

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Journal of Wuhan University of Technology(Materials Science) 2015年第1期30卷 166-174页

作者：张羊换 YANG Tai CHEN Licui XU Chao ren huiping ZHAO Dongliang 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

The casting and annealing technologies were applied to fabricate the La0.8Mg0.2Ni3.3Co0.2Six （x = 0-0.2） electrode alloys. The effects of Si content and annealing temperature on the structure and electrochemical performances of the alloys were investigated systematically. The analyses of XRD and SEM show that all the alloys possess a multiphase structure, involving two main phases （La, Mg）2Ni7 and LaNi5 as well as a residual phase LaNi3. The addition of Si brings on an evident increase in the LaNi5 phase and a decrease in the （La, Mg）2Ni7 phase, without altering the main phase component of the alloy, which also makes the lattice constants and cell volumes of the alloy enlarged. Likewise, the annealing treatment engenders the same action on the lattice constants and cell volumes as adding Si. Simultaneously, it gives rise to the variation of the phase abundance and the coarsening of the alloy grains. The electrochemical measurements indicate that the addition of Si ameliorates the cycle stability of the as-cast and annealed alloys significantly, but impairs their discharge capacities clearly. Similarly, the annealing treatment makes a positive contribution to the cycle stability of the alloy evidently, and the discharge capacity of the alloy shows a maximum value with annealing temperature rising. Furthermore, the high rate discharge ability （HR） first augments and then declines with the rising of Si content and annealing temperature.

关键词： A2B7-type electrode alloy Si addition annealing temperature structure electrochemical performances

Origin mechanism of pitting corrosion induced by cerium inclusions

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Journal of Rare Earths 2023年第9期41卷 1448-1458,I0007页

作者： Xiangjun Liu Changqiao Yang huiping ren Yiming Li Zili Jin Fang Zhang Jichun Yang School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resource Inner Mongolia University of Science and TechnologyBaotou 014010China

In this paper,the origin mechanism of pitting corrosion induced by Ce_(2)O_(3),Ce_(2)O_(2)S,and CeAlO_(3) inclusions in a microalloyed steel was investigated by field emission scanning electron microscopy with energy dispersive spectroscopy and electron backscattered diffraction,conductivity atomic force microscopy,immersion test,and first-principles *** results show that the Ce_(2)O_(3),Ce_(2)O_(2)S,and CeAlO_(3) inclusions are non-conductive,which are impossible to form corrosion couples with the steel *** are no obvious lattice distortion zones in the steel matrix around the Ce_(2)O_(3),Ce_(2)O_(2)S,and CeAlO_(3) inclusions,so it is difficult to form micro-galvanic corrosion near the Ce *** order of work functions of the Ce inclusions and the steel matrix from small to large is Ce_(2)O_(2)Srentially to the steel matrix in the solution by the salt effect,which lead to pitting corrosion of Ce-containing microalloyed steel.

关键词： Microalloyed steel Rare earth inclusion Conductivity atomic force microscopy First-principles calculation Pitting corrosion

Hydrogen Storage Kinetics of Nanocrystalline and Amorphous LaMg_(12)-Type Alloy–Ni Composites Synthesized by Mechanical Milling

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Journal of Materials Science & Technology 2016年第3期32卷 218-225页

作者： Yanghuan Zhang Baowei Li huiping ren Tai Yang Shihai Guo Yan Qi Dongliang 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

The nanocrystalline and amorphous LaMg11Ni ＋ x wt% Ni （x = 100, 200） composites were synthesized by the mechanical milling, and their gaseous and electrochemical hydrogen storage kinetics performance were systematically investigated, The results indicate that the as-milled composites exhibit excellent hydrogen storage kinetic performances, and increasing Ni content significantly facilitates the improvement of the hydrogen storage kinetics properties of the composites. The gaseous and electrochemical hydrogen storage kinetics of the composites reaches a maximum value with the variation of milling time. Increasing Ni content and milling time both make the hydrogen desorption activation energy lower, which are responsible for the enhancement in the hydrogen storage kinetics properties of the composites. The diffusion coefficient of hydrogen atom and activation enthalpy of charge transfer on the surface of the as-milled composites were also calculated, which are considered to be the dominated factors for the electrochemical high rate discharge ability.

关键词： LaMg12 alloy Mechanical milling Activation energy Hydrogen storage kinetics

Experimental Investigation on Microstructure and Segregation of Ultrahigh Strength Al-Zn-Mg-Cu-Zr-Sc-Ni Alloy during Homogenization

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稀有金属材料与工程 2009年第A03期38卷 83-87页

作者： Li Zhenliang Xie Jianxin Chen Wei Zhai Jing ren huiping Wang Yufeng University of Science and Technology Beijing Beijing 100083 China Ningbo Branch of China Academy of Ordnance Science Ningbo 315103 China Inner Mongolia University of Science and Technology Baotou 014010 China

Ultrahigh strength Al-12Zn-2.4Mg-1.1Cu-0.20Zr-0.30Sc-0.30Ni alloy billets were fabricated by spray deposition method(the Osprey process). The effect of homogenization treatment on the microstructures and tensile properties were investigated by OM, SEM and EDS. The results show that adding small amount of Sc and Zr can greatly refine the grain size of the billet, with the average grain size of 10 μm. Grain-boundary becomes coarser firstly and then thinner under different homogenizing condition and grain coarsening were observed. The solute elements content of Zn inside grains has a peak at 490 ℃ /2 h, and Cu element, which was solved into matrix, can enhance the matrix hardness obviously during homogenization. The suitable homogenizing treatment is 460～490 °C/2 h for the hot extrusion of the studied alloy; after the optimized solid solution and T6 aging, the highest ultimate tensile strength (UTS) is 858 MPa with a ductility of 4.8%.

关键词：喷射沉积方法晶粒合金热挤压

Effects of RE(La,Ce)on fcc-bcc martensitic transformation of iron via Bain transformation path

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Journal of Rare Earths 2022年第11期40卷 1812-1818,I0006页

作者： Haiyan Wang Xueyun Gao Lei Xing Tingting Zhai Meng Lv huiping ren Huihui Wei Jianguo Zhi School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resource Inner Mongolia University of Science and TechnologyBaotou 014010China Inner Mongolia Baotou Steel Union Co. Ltd. Inner Mongolia Enterprise Key Laboratory of Rare Earth Steel Products Research and Development Baotou 014010China

The fundamental understanding of the effects of rare earth(RE)on the phase transformation of Fe-based alloys is essential in the development of advanced RE-containing high strength *** this work,we investigated the effects of La and Ce on the martensitic phase transformation of Fe in terms of the driving force and minimum energy path(MEP)using the first-principles *** calculations of formation energy show that the RE substitution increases the stabilization of fcc-Fe and decreases that of bcc-Fe,thus decreasing the driving force of phase ***,the analysis based on the generalized solid-state nudged elastic band(G-SSNEB)method indicates that in the RE-containing systems,an additional energy barrier appears when the phase transformation proceeds along the Bain transition path to c/a ratio of 1.14 in the FM state,which is associated with a sudden decrease in magnetization due to the hybridization between the orbits of the RE atoms and those of the nearest neighbor Fe *** results of potential-energy surfaces(PES)confirm that magnetic ordering and lattice volume change simultaneously with the Bain transition,and in comparison to pure Fe,the variation between the onset and the end structural volumes of the phase transformation is slight for the REcontaining Fe systems.

关键词： First-principles calculations Rare earth Fe Generalized solid-state nudged elastic band Martensitic transformation