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Degradation Characters of La-Mg-Ni-Based Metal Hydride Alloys:Corrosion and Pulverization Behaviors

Acta Metallurgica Sinica(English Letters) 2018年第7期31卷 723-734页

作者： Yi-Ming Li Yang-Huan Zhang hui-ping ren Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and Technology

Degradation behaviors of three typical La-Mg-Ni alloys, La2MgNi9, La1.5Mg0.5Ni7 and La4MgNi19, were studied. La1.5- Mg0.5Ni7 with （La,Mg）2Ni7 as main phase presents better discharge capacity and cycling stability. The three alloys suffer severe pulverization and corrosion after electrochemical cycles, which are considered to be the significant factor attributing to the capacity deterioration. However, the overall corrosion extent of the three cycled alloys aggravates successively, which is inconsistent with the result that LaEMgNi9 presented poor cycling stability and also the assumption that alloy with high Mg content is easy to be corroded. The intrinsic anti-corrosion and anti-pulverization characteristics of the three alloys are mainly focused in this work. Immersion corrosion experiments demonstrate that the Mg-rich phases are more easily to be corroded. The corrosion resistance of the three alloys presents an improved trend which is inversely proportional to abundance of the Mg-rich phases. However, the anti-pulverization abilities present an inverse trend, which is closely related to the mechanical property of various phase structures. LaNi5 with the highest hardness is easy to crack, but the soft （La,Mg）Ni2 is more resistant to crack formation and spreading. Thus, the weaker corrosion of La2MgNi9 after electro- chemical cycling is attributed to the better intrinsic anti-pulverization capability though the anti-corrosion is poor. As La4MgNi19 possesses excellent corrosion resistance, enhancement of the anti-pulverization ability is urgent for improvement in the cycling stability.

关键词： La-Mg-Ni-based alloys Degradation behaviors Corrosion Pulverization

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Microstructure and properties of Inconel 625+WC composite coatings prepared by laser cladding

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Rare Metals 2021年第8期40卷 2281-2291页

作者： Zhi-Hua Tian Yong-Tao Zhao Ya-Jun Jiang hui-ping ren School of Material and Metallurgy Inner Mongolia University of Science and TechnologyBaotou014010China

Inconel 625+WC composite coatings were prepared on the surface of 2Cr13 steel by laser *** microstructure,microhardness and corrosion resistance of the composite coatings with different WC contents were investigated in *** results show that the phase compositions of the composite coatings are mainly y-(Ni,Fe)and various *** content of WC has a significant effect on the microstructure of the cladding *** the WC content is 10 wt%and 15 wt%,the cladding layer has developed columnar ***,the 20 wt%WC coating is mainly composed of cellular dendrites and columnar *** the increase in WC content,the average hardness of the composite coating gradually *** average hardness of 20 wt%WC coating is the highest(HV_(1)536.98),which is a factor of2.64 greater than that of the 2 Cr13 steel *** results show that all the composite coatings have better corrosion resistance than 2 Cr13 steel in 0.5 mol·L^(-1) HCl *** composite coating with 10 wt%WC has the best corrosion resistance,its corrosion potential(E_(corr))is 0.78806 V higher than that of 2 Cr13 steel,and the corrosion current density(I_(corr))is only 0.86%that of 2 Cr13 steel.

关键词： Laser cladding WC content Inconel 625 Electrochemical corrosion Microhardness

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Effect of Ce on solute redistribution in liquid ahead of solid–liquid interface during solidification of Fe–4 wt.%Si alloy

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Journal of Iron and Steel Research International 2021年第10期28卷 1251-1258页

作者： Yun-ping Ji Ming-xing Zhang Yuan Hou Tong-xin Zhao Yi-ming Li hui-ping ren School of Material and Metallurgy Inner Mongolia University of Science and TechnologyBaotou014010Inner MongoliaChina Inner Mongolia Autonomous Region Key Laboratory of Advanced Metal Materials Baotou014010Inner MongoliaChina School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQLD4072Australia Testing Center Inner Mongolia University of Science and TechnologyBaotou014010Inner MongoliaChina Analytical Applications Center SHIMADZU(China)Co. Ltd.Shanghai200233China

The high efficiency of Ce addition in grain refinement ofδ-ferrite in a cast Fe–4 wt.%Si alloy was *** order to further understand the solute effect of Ce on the grain refinement of δ-ferrite,the conventional directional solidification technique,which enabled to freeze the solid–liquid interface to room temperature,was used to investigate the interfacial morphology and solute redistribution in the liquid at the front of the interface,together with thermodynamic calculation of the equilibrium partition coefficients of Ce and Si in Fe–4 wt.%Si–Ce system using the Equilib module and the FsStel database in FactSage software *** examination using a laser scanning confocal microscope showed a transition of the solid–liquid interface from planar to cellular in the Fe–4 wt.%Si alloy after adding 0.0260 wt.%Ce during the directional solidification ***,electron probe microanalysis revealed an enhanced segregation of Si solute in the liquid at the front of the solid–liquid interface due to the Ce *** solute segregation is considered as the cause of planar to cellular interface transition,which resulted from the creation of constitutional supercooling *** calculation indicated that Ce also segregated at the solid–liquid interface and the Ce addition had negligible effect on the equilibrium partition coefficient of *** is reasonable to consider that the contribution of Ce to the grain refinement ofδ-ferrite in the cast Fe–4 wt.%Si alloy as a solute was marginal.

关键词： Ce Fe-4 wt.%Si alloy Solute redistribution Directional solidification Electron probe microanalysis Thermodynamic calculation

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Structure and electrochemical performances of Mg20-xYxNi10（x=0-4） alloys prepared by mechanical milling

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Rare Metals 2019年第10期38卷 954-964页

作者： Yang-Huan Zhang Xi-ping Song Pei-Long Zhang Yong-Guo Zhu hui-ping ren Bao-Wei Li Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Beijing Whole Win Materials Sci.&Tech.Co. Ltd.Beijing 100083Chin

Mg2Ni-type Mg20-xYxNi10(x=0,1,2,3 and4) electrode alloys were fabricated by vacuum induction ***,the as-cast alloys were mechanically milled on a planetary-type ball *** effects of milling time and Y content on the microstructures and electrochemical performances of the alloys were investigated in *** results show that nanocrystalline and amorphous structure can be successfully obtained through mechanical *** substitution of Y for Mg facilitates the glass forming of the Mg2Ni-type alloy and significantly enhances the electrochemical characteristics of the alloy ***,the discharge capacity of Y-free alloy monotonously grows with the milling time prolonging,while that of the Y-substituted alloys has the maximum values in the same *** milling time of obtaining the greatest discharge capacity markedly decreases with Y content *** electrochemical kinetics of the alloys,including high rate discharge ability(HRD),diffusion coefficient(D),limiting current density(IL) and charge transfer rate,monotonously increase with milling time extending.

关键词： Mg2Ni-type alloy Y substitution for Mg Milling duration Electrochemical performances

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Changes of crystal structure and hydrogen storage performances for multiphase La0.7Mg0.3Ni3 alloy upon gas–solid cycling

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Rare Metals 2017年第2期36卷 101-107页

作者： Yi-Ming Li Han-Wei Zhang Yang-Huan Zhang Zhuo-Cheng Liu hui-ping ren School of Materials Science and Engineering Shanghai UniversityShanghai 200072China Analytical and Testing Center Inner Mongolia University of Science and TechnologyBaotou 014010China Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China

In order to examine the effects of structure stability on the degradation behaviors of multiphase La0.7Mg0.3Ni3 alloy,changes of the crystal structure and hydrogen storage properties after gas-solid cycling were investigated in *** structural analysis identifies that（La,Mg）Ni3（PuNi3-type） phase transforms to amorphous,i.e.,hydrogen-induced amorphization（HIA） occurs whereas LaNi5（CaCu5-type）,（La,Mg）2Ni7（Ce2Ni7-type）,and（La,Mg）5Ni19（Pr5Co19-type） phases still keep crystalline upon hydriding/dehydriding *** amorphization remarkably affects both the gas-solid and electrochemical storage *** plateau of PCT curves becomes narrow and steep with ***,the maximum electrochemical capacity decreases notably after gas-solid hydrogenation *** electrochemical capacity reduction could be ascribed to both drop of the maximum storage capacity and the slope of plateau induced by partial *** direct electrochemical cycling,it is suggested that the capacity decay is mainly attributed to HIA in the initial stage.

关键词： RE-Mg-Ni hydrogen storage alloys Gas-solid cycling Partial amorphization Capacity degradation

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Degradation behaviors of La–Mg–Ni-based metal hydride alloys:structural stability and influence on hydrogen storage performances

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Acta Metallurgica Sinica(English Letters) 2018年第9期31卷 897-909页

作者： Yi-Ming Li Bao-Yu Duan Zhuo-Cheng Liu Yang-Huan Zhang hui-ping ren Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Analytical and Testing Center Inner Mongolia University of Science and Technology

The present work focuses on the structural stability upon hydrogenation of three typical La-Mg-Ni-based alloys： La2 MgNi9, LaaMgNi14 and La4MgNi19. Structural changes during gaseous and electrochemical cycles were characterized, and the influence of the structure distortion on the hydrogen storage properties was concerned. Hydrogen-induced amor- phization （HIA） and disproportionation of the three alloys have occurred during both the gaseous and electrochemical cycles. Structural stability of the phase structures in the La-Mg-Ni system is found to follow the order： LaNi5- 〉（La,Mg）5Ni19 〉（La,Mg）2Ni7 〉（La,Mg）Ni3 〉（La,Mg）Ni2. HIA increases thermal stability of the metal hydrides and difficulty to dehydrogenation and leads to degradation of both the gaseous and electrochemical capacities. Interestingly, LaEMgNi9 with poor stability presents elevated discharge capability even at 60 ℃ which can be attributed to increase in the hydrogen desorption capability and inhibition of the self-discharge induced by severe HIA at higher temperatures. In addition, HIA in the electrochemical reactions is obviously weaker than the extent during the gaseous cycles, which is mainly due to the slower hydrogenation speed. The development of HIA in the gaseous and electrochemical process is considered to follow the direct and gradual modes, respectively.

关键词： La-Mg-Ni-based alloys Degradation behaviors Hydrogen-induced amorphization Electrochemicalproperties

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The electrochemical hydrogen storage performances of Si-added La–Mg–Ni–Co-based A_2B_7-type electrode alloys

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Rare Metals 2015年第8期34卷 569-579页

作者： Yang-Huan Zhang Li-Cui Chen Tai Yang Chao Xu hui-ping ren Dong-Liang Zhao Key Laboratory of Integrated Exploitation of Baiyun Obo MultiMetal Resources Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute

In order to improve the electrochemical cycle stability of the RE–Mg–Ni-based A2B7-type electrode alloys, a small amount of Si has been added into the *** casting and annealing technologies were adopted to fabricate the La0.8Mg0.2Ni3.3Co0.2Six(x = 0–0.2) electrode alloys. The impacts of the addition of Si and annealing treatment on the structures and electrochemical performances of the alloys were investigated systematically. The results obtained by XRD and SEM show that all the as-cast and annealed alloys are of a multiphase structure, involving two main phases(La, Mg)2Ni7and La Ni5 as well as a residual phase La Ni3. Both adding Si and the annealing treatment lead to an evident change in the phase abundance and cell parameters of(La, Mg)2Ni7and La Ni5 major phases of the alloy without altering its main phase component. Moreover, the annealing treatment has the composition of the alloy distributed more homogeneously overall and simultaneously causes the grain of the alloy to be coarsened obviously. The electrochemical measurements indicate that adding Si and the annealing treatment give a significant rise to the influence on the electrochemical performances of the alloys. In brief, the cycle stability of the as-cast and annealed alloys evidently increases with the rising of Si content, while their discharge capacities obviously decrease under the same circumstances. Furthermore, the electrochemical kineticproperties of the electrode alloys, including the high rate discharge ability, the limiting current density(IL), hydrogen diffusion coefficient(D), and the charge-transfer resistance, first augment and then decline with the rising of Si content. Similarly, it is found that the above-mentioned electrochemical properties first mount up and then go down with the rising annealing temperature.

关键词： A2B7-type electrode alloy Adding Si Annealing trea

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Effect of solute Ce,Mn,and Si on mechanical properties of silicon steel:insights from DFT calculations

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Journal of Iron and Steel Research International 2024年第3期31卷 700-709页

作者： Xiang-jun Liu Ji-chun Yang hui-ping ren Xiao-bin Jia Ming-yi Zhang Chang-qiao Yang School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resource Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina Inner Mongolia North Heavy Industries Group Co. Ltd.Baotou 014010Inner MongoliaChina Inner Mongolia Metal Material Research Institute Baotou 014010Inner MongoliaChina

The influence of solute Ce,Mn,and Si on the mechanical properties of silicon steel was investigated by first-principles ***,Mn,and Si can all be solubilized in Fe *** significantly reduces the incompressibility and rigidity of the system but also significantly improves the toughness and *** effect of Mn on mechanical properties of the system is not *** has a significant effect on the improvement in incompressibility and rigidity but a limited effect on the improvement in toughness and *** metallic bond strength of Fe-Ce,Fe-Mn,and Fe-Si doped systems is weaker than that of the pure Fe system,which can be used to explain the reduction in the incompressibility and rigidity of these doped *** relatively high electron cloud density in the doped system may be responsible for the increase in toughness.

关键词： Silicon steel Rare earth First-principles calculation Elastic modulus Electronic structure

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Electrochemical performances of as-cast and annealed La_(0.8-x)Nd_xMg_(0.2)Ni_(3.35)Al_(0.1)Si_0.05(x=0-0.4) alloys applied to Ni/metal hydride (MH) battery

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Rare Metals 2013年第2期32卷 150-158页

作者： Yang-Huan Zhang hui-ping ren Tai Yang Chen Zhao Li-Cui Chen Hong-Wei Shang 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

The La-Mg-Ni-based A2B7-type Lao.8_xNdx ***.o5 （x = 0, 0.1, 0.2, 0.3, and 0.4） electrode alloys were prepared by casting and annealing. The influence of the partial substitution of Nd for La on the structure and electrochemical performances of the alloys was investigated. The structural analysis of X-ray diffraction and scanning electron microscopy reveals that the experimental alloys consist of two major phases：（La,Mg）2Ni7 with the hexagonal Ce2Ni7-type structure and LaNi5 with the hexagonal CaCus-type structure as well as some residual phases of LaNi3 and NdNis. The electrochemical measurements indicate that an evident change of the electrochemical performance of the alloys is associated with the substitution of Nd for La. The discharge capacity of the alloy first increases then decreases with the growing Nd content, whereas their cycle stability clearly grows all the time. Furthermore, the measurements of the high rate discharge ability, the limiting current density, and hydrogen diffusion coefficient all demonstrate that the electrochemical kinetic properties of the alloy electrodes first augment then decline with the rising amount of Nd substitution.

关键词： A2B7-type electrode alloy Substitution Lawith Nd Structure Electrochemical performance

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Hydriding and dehydriding kinetics of melt spun nanocrystalline Mg20Ni10-xCux (x = 0-4) alloys

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Natural Science 2010年第1期2卷 18-25页

作者： Yang-Huan Zhang Dong-Liang Zhao Bao-Wei Li hui-ping ren Shi-Hai Guo Xin-Lin Wang 不详

The nanocrystalline Mg2Ni-type electrode alloys with nominal compositions of Mg20Ni10-xCux (x = 0, 1, 2, 3, 4) were synthesized by melt-spinning technique. The microstructures of the alloys were characterized by XRD, SEM and HRTEM. The hydrogen absorption and desorption kinet-ics of the alloys were measured using an auto-matically controlled Sieverts apparatus. The re- sults show that all the as-spun alloys hold ty- pical nanocrystalline structure. The substitution of Cu for Ni does not change the major phase Mg2Ni but it leads to the formation of the sec-ondary phase Mg2Cu. The hydrogen absorption capacity of the alloys first increases and then decreases with rising Cu content, but the hy-drogen desorption capacity of the alloys mono- tonously grows with increasing Cu content. The melt spinning significantly improves the hydro- genation and dehydrogenation capacities and kinetics of the alloys.

关键词： Mg2Ni-Type Alloy Substituting Ni with Cu Melt Spinning Hydriding and Dehydriding

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