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The effects of deformation parameters and co.ling rates on the aging behavior of AZ80+0.4%Ce

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Journal of Magnesium and Alloys 2024年第2期12卷 639-658页

作者： Yongbiao Yang Jinxuan Guo Cuiying Wang Ting Yan Zhang Wenxuan Jiang Zhimin Zhang Qiang Wang Guojun Li Jun Wang co.lege of materials Science and Engineering North University of ChinaLane 3Xueyuan RoadTaiyuanShanxiChina030051 State Key Laboratory of advanced Stainless Steel materials Taiyuan Iron Steel(Group)Co.Ltd.Taiyuan 030003China Technology Center Shanxi Taigang Stainless Steel Co.Ltd.Taiyuan 030003China

The extruded AZ80+0.4%Ce magnesium alloy was twisted in the temperature range of 300-380℃by using a Gleeble 3500 thermal simulation test machine with a torsion unit.The deformed cylindrical specimens were co.led at a co.ling rate of 10℃/s or 0.1℃/s,respectively,and aged at 170℃.The microstructure analysis results showed that the grain size decreased with increasing specimen radial position from center(SRPC),and that the strong initial basal texture of the extruded magnesium alloy was weakened.Both co.tinuous and disco.tinuous dynamic recrystallization mechanisms were involved in co.tributing to the grain refinement for all specimens investigated.And a novel extension twinning induced dynamic recrystallization mechanism was proposed for specimen deformed at 300℃.For the specimens deformed at 300℃and 340℃followed by a slow co.ling rate(0.1℃/s),precipitates of various shapes(β-Mg_(17)Al_(12)),with the dominant precipitates being on the grains boundaries,appeared on the surface section.For specimen deformed at 380℃,lamellar precipitates(LPS)in the interiors of the grains were predominant.After aging,the LPS still dominated for specimens twisted at 380℃;however,the LPS gradually decreased with decreasing deformation temperatures from 380℃to 300℃.Dynamically precipitatedβ,especially those deco.ating the grain boundaries,changed the co.petition pictures for the LPS and precipitates of other shapes after aging.Interestingly,LPS dominated the areas for the center section of the specimens after aging regardless of deformation temperatures.Low temperature deformation with high SRPC followed by rapid co.ling rate increased the micro hardness of the alloy after aging due to refined grain,reduced precipitates size,decreased lamellar spacing as well as strain hardening.

关键词： AZ80+0.4%Ce magnesium alloy Hot torsion Deformation parameters co.ling rate Aging Micro hardness

Strategy of preparing Smco.based films with high co.rcivity and remanence ratio achieved by temperature and chemical optimization

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Journal of Rare Earths 2024年第7期42卷 1289-1297页

作者： Yansong Gong Zhaoguo Qiu Sizhe Liang Xinrui Zheng Hongxia Meng Zhigang Zheng Deyang Chen Shengfu Yuan Weixing Xia Dechang Zeng J.P.Liu School of materials Science and Engineering South China University of Technology Zhongshan R&D Center for materials Surface and Thin Films Technology of the South China University of Technology Gent Materials Surface Technology(Guangdong) Co.Ltd. Institute for advanced materials South China Academy of Advanced OptoelectronicsSouth China Normal University Yangjiang Branch Guangdong Laboratory Materials Science and Technology Yangjiang Advanced Alloys Laboratory Laboratory of Rare-Earth Magnetic Functional materials Ningbo Institute of Material Technology and EngineeringChinese Academy of Sciences Department of Physics University of Texas at Arlington

Smco.based films with excellent intrinsic magnetic properties have promising applications in microelectro-mechanical system（MEMS）.However,due to the co.plexity of phase co.position and unco.trollable crystallization degree of Smco.hard magnetic phase in the film,both the co.rcivity（Hc） and remanence（Mr） of films are difficult to enhance simultaneously.In this paper,Smco.based films were deposited with a Cr underlayer and capping layer on single crystal Si substrates via magnetron sputtering process.The effects of annealing parameters and Sm/co.atomic ratio on the phase structure and co.rcivity of films are discussed.By adjusting the Sm/co.atomic ratio from 1:5 to 1:4,co.soft magnetic phase disappears and the single phase Smco.is obtained,leading to the increase of co.rcivity of the films from30 to 34 kOe.The influence of deposition temperature and Cu doping on magnetic properties of Smco.based films was investigated.When the deposition temperature increases from room temperature to250℃,the co.rcivity will further increase from 34 to 51 kOe.However,a severe kink is observed in the demagnetization curves due to the poor exchanged co.pling.An analysis of transmission electron microsco.y（TEM） co.firms that the average size of non-hard magnetic amorphous phase exceeds the effective exchanged co.pling length of Smco.,which co.tributes to the deco.pling and low remanence ratio.Therefore,doping Cu and applying a post-annealing process can significantly improve the crystallization degree of the films.Both the co.rcivity and the remanence ratio of the demagnetization curves are greatly enhanced.We propose a plausible strategy to prepare the Smco.based films with high co.rcivity and remanence ratio by temperature and chemical optimization,which can be utilized in high performed MEMS devices.

关键词： co.rcivity Crystallization co.ditions Phase co.position Rare earths Remanence ratio Smco.based films

Effects of two silico.e resin co.tings on performance of FeSiAl magnetic powder co.es

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1279-1288页

作者： Jia-qi Liu Zheng-qu Zhu Pu Wang Yi-fan Li Jing Pang Jia-quan Zhang School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing100083China Qingdao Yunlu advanced materials Technology co. Ltd.Qingdao266232ShandongChina

Two silico. resins with excellent thermal stability,JH1123 and JH7102,are used as the insulated agents and binders for the gas-atomized FeSiAl powder,and co.responding magnetic powder co.es(MPCs)are fabricated.The insulation capability and application prospects of the two silico. resins are evaluated by co.paring the magnetic properties of the co.ted powder and MPCs.The scanning electron microsco.y,energy dispersive X-ray spectrosco.y and Fourier transform infrared spectrosco.y results show that uniform insulation layers are both formed on the powder surfaces.JH1123 has stronger binding ability,and the JH1123-co.ted powder exhibits severe agglomeration,with d50(average particle size)approximately twice that of the JH7102-co.ted powder.Both as-prepared MPCs exhibit outstanding soft magnetic properties.Wherein,the permeability of FeSiAl@JH1123 is up to 74.0,which is 35.5%higher than that of FeSiAl@JH7102 because JH1123 can further improve the density of the MPCs.As for FeSiAl@JH7102,it has better direct current bias and lower co.e loss of 716.9 mW cm^(−3) at 20 mT and 1000 kHz due to its lower co.rcivity and greater anti-magnetic saturation ability.A co.prehensive co.parison shows that FeSiAl@JH1123 is suitable for medium and high frequency applications,while FeSiAl@JH7102 is more suitable for high frequency applications.This indicates that the use of JH1123 and JH7102 silico. resins for binding and insulated co.ting not only simplifies the preparation process of MPCs,but also enables the co.trolled production of MPCs for different applications.

关键词： FeSiAl Insulated co.ting Magnetic powder co.e Permeability co.e loss

Surface deco.ation of mesocarbon microbeads with multifunctional TiNbO4-x@C co.ting layer as high rate and stable anode of Li-ion batteries

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Rare Metals 2024年第5期43卷 2053-2066页

作者： Jia-Mei Lai Zhi-Min Zou Yu Bai Yu-Tao Xing Chun-Hai Jiang Fujian Provincial Key Laboratory of Functional materials and Applications Institute of Advanced Energy Materials School of Materials Science and Engineering Xiamen University of Technology Shanghai XFH Science and Technology Development co. Ltd. Fujian XFH New Energy materials co. Ltd. Shenzhen XFH Science and Technology co. Ltd. Laboratório de Microsco.ia Eletr?nica de Alta Resolu??o Centro de Caracteriza??o Avan?ada Para a Indústria de Petróleo (LaMAR/CAIPE) Universidade Federal Fluminense

Surface modification of graphite anode with electroactive matters has been proven of a more practical strategy in enhancing the performance of Li-ion batteries than exploring alternative novel anode materials.Herein,rutile Ti NbO4-xnanoparticles with a tunnel structure are employed as multifunctional deco.ation substances in co.bination with a carbon co.ting layer to improve the rate and cycle properties of mesocarbon microbeads（MCMBs）.As co.pared to pristine MCMB,the Li+diffusion co.fficients of the co.posite anodes are enhanced due to the synergistic effect of Ti Nb O4-x@C.Meanwhile,the overcharge and voltage polarization of the co.posite anodes at high rate are obviously minimized due to the current sharing effect of the high-potential TiN-bO4-x.Moreover,the amorphous LiyTi Nb O4-xco.verted from Ti NbO4-xin the initial lithiation process can deliver pseudocapacitive capacity to the co.posite anodes from the seco.d cycle.All of these functions of Ti NbO4-x@C co.ting layer have directly co.tributed to the improved rate and cycle performance of the MCMB/TiNbO4-x@C co.posite anodes.The one co.taining 12.0 wt%Ti NbO4-xexhibits a high reversible specific capacity of 118 m Ah·g-1at 10C (1C=372 m A·g-1),together with a high capacity retention of 90.9%after 300 cycles at 3C,which are all much superior to those of pristine MCMB.

关键词： Li-ion batteries MCMB TiNbO 4− x Surface deco.ation Rate capability

Inclusions modification by rare earth in steel and the resulting properties: A review

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Journal of Rare Earths 2024年第3期42卷 431-445,I0001页

作者： Xiaoqiang Wang Zhiwei Wu Bing Li Wenxiong Chen Jun Zhang Jian Mao co.lege of materials Science and Engineering Sichuan UniversityChengdu610065China Chengdu advanced Metal materials Industry Technology Research Institute co. Ltd.Chengdu610303China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114009China

Rare earth(RE) elements are excellent modifiers for non-metallic inclusions that inevitably appear in steel and affect steel properties. This paper reviews the research status of inclusions modification by RE elements and the changes it cause on steel properties. First, the inclusion changes caused by RE modification are described. Generally, after adding pure RE, the main evolution of inclusions occurs as M →M + RE-Al-O → RE-Al-O + RE_(2)O_(2)S → RE_(2)O_(2)S + RE—S/RE_(2)O_(2)S + RE-O with an increase in the RE co.tent(M represents the inclusions before RE addition). The type of final inclusion obtained after RE modification is related to the relative co.tents of S and O in the steel. Moreover, fine, regular, and uniformly distributed inclusions can be obtained with appropriate RE addition. However, the effectiveness of inclusions modification by adding both RE and non-RE elements is closely related to the order of their addition. Seco.d, the applications and advantages of thermodynamic calculations in the study of RE-modified inclusions are introduced. Third, the changes in the co.rosion resistance, impact properties,and other properties of steel caused by the modification of inclusions by RE are reviewed. Finally, the perspectives and trends of inclusions modified by RE elements in the steel industry are presented.

关键词： Rare earths Inclusions Modification Thermodynamic calculation Properties change

Effect of cerium on microstructure,texture and properties of ultrahigh-purity co.per

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Journal of Rare Earths 2024年第1期42卷 220-227,I0008页

作者： Yunxiao Hua Haitao Liu Kexing Song Jiangwei Wang Yin'gang Guo Jing Tian Huiwen Guo Provincial and Ministerial co.co.struction of co.laborative Innovation Center for Non-ferrous Metal New materials and advanced Processing Technology School of Materials Science and EngineeringHenan University of Science and TechnologyLuoyang471023China Henan Academy of Sciences Zhengzhou450000China Center of Electron Microsco.y and State Key Laboratory of Silico. materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Henan Zhongyuan Gold Smelter co. Ltd.Sanmenxia472100China Chinalco.Luoyang co.per Processing co. Ltd.Luoyang471039China

The effects of Ce addition(310 ppm and 1500 ppm)on the microstructure,texture and properties of ultrahigh-purity co.per(99.99999%)were systematically studied using scanning electron microsco.y(SEM),transmission electron microsco.y(TEM)and electron backscattered diffraction(EBSD)analyses,co.bined with the microhardness and co.ductivity tests.Regarding the microstructure of the as-cast and as-extruded samples,the addition of Ce refines the grain size of the ultrahigh-purity co.per and the refinement effect of 310Ce alloy is greater than that of 1500Ce alloy.This is due to the stronger co.pone nt superco.ling and the accele rated recrystallization caused by lower Ce co.ntent.In addition,Ce can react with Cu to form the Cu-Ce eutectic phases,which are deformable during the hot deformation.Furthermore,the added Ce can weaken the texture,showing a variation of brass recrystallization(BR),rotated cube,co.per and S texture co.ponents,which depends on the recrystallization,the particle stimulated nucleation(PSN)as well as the stacking fault energy(SFE).Most remarkably,the introduction of Ce enhances the hardness of the ultrahigh-purity co.per without obviously reducing its co.ductivity.The major{111}orientations and the stress distributions are responsible for such a superior co.ductivity of the Ce-co.taining alloys.

关键词： Ce addition Grain refinement Texture co.ductivity Ultrahigh-purity co.per Rare earths

Microstructures,co.rosion behavior and mechanical properties of as-cast Mg-6Zn-2X(Fe/Cu/Ni)alloys for plugging tool applications

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International Journal of Minerals,Metallurgy and materials 2024年第4期31卷 697-711页

作者： Baosheng Liu Jiali Wei Shaohua Zhang Yuezhong Zhang Pengpeng Wu Daqing Fang Guorui Ma School of materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China State Key Laboratory for Mechanical Behavior of materials Xi’an Jiaotong UniversityXi’an 710049China Intelligent Equipment Research and Development Center Zhuhai Institute of Advanced Technology Chinese Academy of SciencesZhuhai 519080China advanced materials Research Institute Zhuhai Dingmei Medical Technology Co.Ltd.Zhuhai 519000China

Mg-6Zn-2X(Fe/Cu/Ni)alloys were prepared through semi-co.tinuous casting,with the aim of identifying a degradable magnesium(Mg)alloy suitable for use in fracturing balls.A co.parative analysis was co.ducted to assess the impacts of adding Cu and Ni,which result in finer grains and the formation of galvanic co.rosion sites.Scanner electronic microsco.y examination revealed that precipitated phases co.centrated at grain boundaries,forming a semi-co.tinuous network structure that facilitated co.rosion penetration in Mg-6Zn-2Cu and Mg-6Zn-2Ni alloys.Pitting co.rosion was observed in Mg-6Zn-2Fe,while galvanic co.rosion was identified as the primary mechanism in Mg-6Zn-2Cu and Mg-6Zn-2Ni alloys.Among the tests,the Mg-6Zn-2Ni alloy exhibited the highest co.rosion rate(approximately 932.9 mm/a)due to its significant potential difference.Mechanical testing showed that Mg-6Zn-2Ni alloy possessed suitable ultimate co.pressive strength,making it a potential candidate material for degradable fracturing balls,effectively addressing the challenges of balancing strength and degradation rate in fracturing applications.

关键词： magnesium alloys microstructure micro-galvanic co.rosion mechanical properties

Regulating the inner Helmholtz plane structure at the electrolyte-electrode interface for highly reversible aqueous Zn batteries

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Journal of Energy Chemistry 2024年第8期95卷 57-67页

作者： Jianghe Liu Sanlue Hu Hexin Guo Guobin Zhang Wen Liu Jianwei Zhao Shenhua Song Cuiping Han Baohua Li Shenzhen Key Laboratory on Power Battery Safety and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen Key Laboratory of advanced materials School of Materials Science and Engineering Harbin Institute of Technology Faculty of materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen HUASUAN Technology co. Ltd.

The development of aqueous Zn batteries is limited by parasitic water reactions,co.rosion,and dendrite growth.To address these challenges,an inner Helmholtz plane（IHP） regulation method is proposed by employing low-co.t,non-toxic maltitol as the electrolyte additive.The preferential adsorption behavior of maltitol can expel the water from the inner Helmholtz plane,and thus hinder the immediate co.tact between Zn metal and H2O.Meanwhile,strong interaction between maltitol and H2O molecules can restrain the activity of H2O.Besides,the "IHP adsorption effect" along with the low LUMO energy level of maltitol-CF3SO3-can promote the in-situ formation of an organic-inorganic co.plex solid electrolyte interface（SEI） layer.As a result,the hydrogen/oxygen evolution side reaction,co.rosion,and dendrites issues are effectively suppressed,thereby leading to highly reversible and dendrite-free Zn plating/stripping.The Zn‖I2battery with hybrid electrolytes also demonstrates high electrochemical performance and ultralong cycling stability,showing a capacity retention of 75% over 20000 charge-discharge cycles at a large current density of 5 A g-1.In addition,the capacity of the device has almost no obvious decay over20000 cycles even at-30℃.This work offers a successful electrolyte regulation strategy via the IHP adsorption effect to design electrolytes for high-performance rechargeable Zn-ion batteries.

关键词： Adsorption effect Dendrite suppression Inner Helmholtz plane SEI layer Zn||I2 battery

Multi-performance evaluation of high-throughput accelerated co.rosion test for high-strength low-alloy 921A steel

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1260-1278页

作者： co.g-co.g Du Ming-hua Qin Zhan-fang Wu Dong-ling Li Lei Zhao Xiang-yang Li Hai-zhou Wang Beijing advanced Innovation Center for materials Genome Engineering National Center for Materials Service SafetyUniversity of Science and Technology BeijingBeijing100083China China Iron and Steel Research Institute Group co. Ltd.Beijing100081China Beijing advanced Innovation Center for materials Genome Engineering Central Iron and Steel Research InstituteBeijing100081China

The co.rosion behavior of high-strength low-alloy 921A steel in a simulated marine atmospheric environment was studied using a high-throughput experimental method.The co.rosion behavior,co.rosion morphology,and co.rosion products of 921A steels were analyzed using various techniques,including co.rosion mass loss method,polarization curve,white-light interferometry,scanning electron microsco.y,energy-dispersive spectrometry,microbeam X-ray fluorescence spectrometry,X-ray diffraction technique,and X-ray photoelectron spectrosco.y.The test results indicated that 921A steel exhibits better co.rosion resistance than Q450NQR1 steel in simulated harsh atmospheric environments,as evidenced by a lower co.rosion mass loss rate throughout the co.rosion tests.The co.rosion products of both steels co.sisted ofα-FeOOH,Fe_(3)O_(4),andγ-FeOOH,withα-FeOOH being more prevalent in the rust layer of 921A steel than in Q450NQR1 steel.The inner rust layer of 921A steel also exhibited an appositional enrichment region of Cr,Ni,Mo,and V,leading to its superior co.rosion resistance co.pared to that of Q450NQR1 steel.The efficacy of high-throughput accelerated co.rosion experimental methods was highlighted for evaluating the co.rosion resistance of steel materials in harsh environmental co.ditions.The findings suggest that 921A steel exhibits better co.rosion resistance co.pared to Q450NQR1 steel and has the potential to be more suitable in harsh marine atmospheric environments.The characterization of the rust layer structures and co.position reveals the parallel enrichment of certain elements in the inner rust layer of 921A steel,which enhances its co.rosion resistance.

关键词： Atmospheric co.rosion High-throughput experimental method High-strength low-alloy steel co.rosion characteristics Rust layer Element enrichment