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Effect of Rolling Temperature on the Mechanical Properties and Corrosion Behavior of Mg-Zn-Y-Nd Alloy Thin Sheets

Acta Metallurgica Sinica(English Letters) 2024年第10期37卷 1721-1734页

作者： Zhibin Liu Guangya Zhu Wenkai Li Di Mei Peihua Du Yufeng Sun Shijie Zhu Shaokang Guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China Henan Province Key Laboratory of Advanced Light Alloys Zhengzhou450002China Key Laboratory of Materials Processing and Mold(Ministry of Education) Zhengzhou450002China

There is a growing demand for degradable membranes with sufficient mechanical properties to guide tissue regeneration in dental *** the present work,a two-stage rolling process in which the first rolling stage(FRS)adopted a reduction rate of 30%for six passes at various temperatures,while the second rolling stage was rolling at 200℃for two passes,was employed to prepare a 150μm-grade Mg-2.0Zn-0.5Y-0.5Nd(ZE21B)Mg alloy sheets for guided tissue regeneration *** microstructure of the thin sheets was gradually refined with increasing rolling passes,and the thin sheets that were rolled at different FRS temperatures exhibit an ellipse *** thin sheets rolled at 350℃for FRS show low elongation due to premature fracture caused by the coarse second phase *** account of uniform and fine grains,the thin sheets rolled at 400℃for the FRS have proper mechanical properties:yield strength of 214.6±8.5 MPa,ultimate tensile strength(UTS)of 246.8±10.3 MPa and elongation to failure of 28.3±1.2%.When rolling at 450℃for FRS,proper ductility of the thin sheets has been acquired,followed by a decline in UTS since a bimodal structure with fine and coarse grain was *** tests demonstrated the FRS temperature had no significant effect on the corrosion behavior and corrosion rate of Mg alloy sheets after 7 days’immersion in artificial saliva *** research has great significance for the production of degradable Mg sheets for guided tissue regeneration membrane.

关键词： Mg alloy thin sheets Two-stage rolling Guided tissue regeneration membrane Artificial saliva Corrosion behavior

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Mg-Sc-Nd-xZn series alloys with medium strength and high plasticity

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Journal of Rare Earths 2024年第12期42卷 2362-2373,I0006页

作者： Fulong Xue Zhuangzhuang Feng Yubo Gao Di Mei Baolin Chang Jianfeng Wang Shijie Zhu Shaokang Guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China Henan Province Key Laboratory of Advanced Light Alloys Zhengzhou450002China Key Laboratory of Materials Processing and Mold(Ministry of Education) Zhengzhou450002China

Different application scenarios put forward diverse requirements of mechanical properties for magnesium *** this study,the extruded Mg-Sc-Nd-Zn alloy series with high plasticity and medium strength was *** uniformly distributed Mg_(3)Nd(β_(1))phase,high-density twins,and the activated non-basal dislocation slips contribute to the high plasticity of Mg-Sc-Nd *** the addition of Zn element,the appearance of coarse ScZn phases,which prevents the activation of{1012}tensile twins,leads to an increase in strength but a simultaneous decrease in the plasticity of the extruded *** the Zn content in the Mg-Sc-Nd-xZn allows a series of alloys with various strengths and plasticity *** results obtained in this work are of great importance for developing a regulatable magnesium alloy series that aims at different application scenarios.

关键词： Magnesium alloy Tension twin Non-basal slip High plasticity Rare earths

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Inducing piezoelectricity in distorted rutile TiO_(2)for enhanced tetracycline hydrochloride degradation through photopiezocatalysis

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Journal of advanced Ceramics 2024年第3期13卷 323-331页

作者： Taotao Xia Lizhen Lu Haoyu Zhang Jinghui Wang Zonghe Huang Hongyang Wang Weiyi Yang Shuang Gao Qi Li Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Various material design strategies have been developed to enhance photocatalytic performance of TiO_(2).However,no report is available on applications of the photopiezocatalysis strategy on TiO_(2)due to its lack of *** we developed a low-temperature molten salt etching process to create rutile TiO_(2)nanoparticles by etching[MgO_(6)]octahedrons away from MgTiO_(3)by molten NH_(4)Cl,during which a lattice distortion occurred in TiO_(2).The lattice distortion broke the structure symmetry of rutile TiO_(2)and subsequently endowed these rutile TiO_(2)nanoparticles with an unusual piezoelectric response with the maximum effective piezoelectric coefficient(d_(33))of~41.6 pm/V,which had not previously been found in TiO_(2)***,the photopiezocatalysis strategy was applied for the first time to enhance the photocatalytic performance of these TiO_(2)*** creation of lattice distortion to induce piezoelectricity could be extended to other photocatalysts that the photopiezocatalysis strategy has not been applied to and may generate novel functionalities for various technical applications.

关键词： photocatalysis TiO_(2) piezocatalysis molten salt etching process photopiezocatalysis

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Sulfate-assisted Ni/Fe-based electrodes for anion exchange membrane saline splitting

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Nano Research 2024年第7期17卷 5985-5995页

作者： Yujun Han Li Shao Yuhang Liu Guodong Li Tongzhou Wang Xuerong Zheng Jihong Li Xiaopeng Han Wenbin Hu Yida Deng School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Saline water electrolysis is an appealing strategy for hydrogen production,attracting more attention in recent ***-based electrodes exhibit promise as catalysts for saline water ***,they suffer from the inferior service life of the oxygen evolution reaction(OER).Herein,we report an oxygen-evolution electrode consisting of a sulfate-modulated nickel-iron hydroxide(NiFeOOH)affording as the catalytic active layer and Fe-Ni_(3)S_(2) as the corrosion-proof *** developed electrode only requires overpotentials of 220 and 292 mV to deliver the current density of 10 and 500 mA·cm^(−2),*** importantly,it presents long-term stability exceeding 140 and 100 h in 1 M KOH at high current densities of 500 and 1000 mA·cm^(−2),respectively,as well as 120 h for saline water electrolysis at 100 mA·cm^(−2).Experimental results reveal that the generated sulfate plays an indispensable role in improving stability and corrosion *** assembled and tested an anion exchange membrane electrolyzer with Pt/C and NiFeS/NIF as the cathode and anode,respectively,under industrial *** overall water-splitting electrolyzer achieves an impressive energy conversion efficiency of 75%±0.5%.This report offers fresh insights into the design of stable NiFe-based electrodes,which may further promote its practical applications for saline water electrolysis.

关键词： saline water electrolysis oxygen evolution reaction anode material water splitting

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Microstructural evolution at grain boundary and deformation mechanism of Nb_(0.5)TiZrV_(0.5)refractory high entropy alloy doped with Ce at room temperature

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Journal of materials science & Technology 2024年第29期196卷 25-39页

作者： H.L.Yao Y.X.Yu J.B.Sha School of Materials Science and Engineering Beijing University of Aeronautics and AstronauticsKey Laboratory of Aerospace Materials and Performance(Ministry of Education)Beijing 100191China

Nb_(0.5)TiZrV_(0.5)alloy is one of the lightweight refractory high-entropy alloys(RHEAs)and has a great potential to be structural ***,the microstructural evolution at the grain boundaries(GBs),the tensile properties and the deformation mechanism including dislocation and kink evolution of arc-melting(Nb_(0.5)TiZrV_(0.5))_(100-x)Ce_(x)RHEAs(at.%,x=0,0.005,0.01,referred to as 0Ce,0.005Ce and 0.01Ce alloys)at room temperature(RT)were systematically *** was found to segregate at GBs and the most pronounced grain refinement effect in the 0.005Ce *** the Ce content increased from 0.005 at.%to 0.01 at.%,the Ce concentration at GBs increased from 0.12 at.%to∼1.17 at.%,subsequently,inducing compositional fluctuation and facilitating transformation of BCC band(V-rich but Zr-poor)toω-like phase with a non-close-packed hexagonal structure(NCPHS,V-and Zr-rich but Ti-poor)at *** 0.005Ce al-loy exhibited the optimized ductility(ε_(f)∼7.15%)and maintained yield strength of approximately 964 MPa at *** better balance of strength-ductility in the 0.005Ce alloy was resulted from synergistic deformation of multiple grains,high fraction(55.6%)of movable edge dislocations and abundant kink bands with the most slip ***,deteriorating ductility(ε_(f)∼2.29%)of the Nb_(0.5)TiZrV_(0.5)alloy with 0.01 at.%Ce addition was mainly attributed to precipitation of the brittleω-like phase at *** results may provide theoretical and experimental guidance for design of the advanced RHEAs with high specific strength through doping Ce or other rare-earth elements.

关键词： Refractory high entropy alloy Cerium addition Microstructure Tensile behaviors Deformation

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Realizing ultra-high strength and excellent ductility in a low-alloyed biomedical Mg-Zn-Ca-MgO composite

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Journal of Magnesium and Alloys 2024年第12期12卷 5108-5118页

作者： Chaokun Tang Shaoyuan Lyu Ruixiao Zheng Guodong Li Zhongyang Liu Minfang Chen Bin Jiang School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education School of Materials Science and EngineeringBeihang UniversityBeijing 100191China National Demonstration Center for Experimental Function Materials Education Tianjin 300384China Key Laboratory of Display Materials and Photoelectric Device(Ministry of Education) Tianjin 300384China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

An ultra-fine grained(UFG)Mg-1Zn-0.2Ca-1.0MgO composite with an average grain size of 0.49μm as well as an excellent combination of yield strength(379 MPa)and ductility(10.1%)was produced by one-step *** heat treatment at 200℃for 30 min further improved its yield strength to 420 MPa and elongation to 12.1%with a slight grain growth to 0.76μ*** observations revealed that the precipitation of high number density of Ca_(2)Mg_(6)Zn_(3)phase was the main reason for the enhanced strength after ageing *** coarsening and recovery of dislocations during ageing improved the work-hardening capability of the extruded sample,leading to improved *** work provides a pathway for the mass production of strong and ductile Mg-based materials without excessive addition of alloying elements.

关键词： Biomedical Mg Ultra-fine grains Precipitation Mechanical properties

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Effects of diamond particle size on microstructure and properties of diamond/Al-12Si composites prepared by vacuum-assisted pressure infiltration

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China Foundry 2024年第4期21卷 360-368页

作者： Jia-ping Fu Can-xu Zhou Guo-fa Mi Yuan Liu School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454100HenanChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China

Diamond/aluminium composites have attracted attention in the field of thermal management of electronic packaging for their excellent *** order to solve the interfacial problem between diamond and aluminium,a novel process combining pressure infiltration with vacuum-assisted technology was proposed to prepare diamond/aluminum *** effect of diamond particle size on the microstructure and properties of the diamond/Al-12Si composites was *** results show that the diamond/Al-12Si composites exhibit high relative density and a uniform *** thermal conductivity and coefficient of thermal expansion increase with increasing particle size,while the bending strength exhibits the opposite *** the average diamond particle size increases from 45μm to 425μm,the thermal conductivity of the composites increases from 455 W·m^(-1)·K^(-1)to 713 W·m^(-1)·K^(-1)and the coefficient of thermal expansion increases from 4.97×10^(-6)K^(-1)to 6.72×10^(-6)K^(-1),while the bending strength decreases from 353 MPa to 246 *** research demonstrates that high-quality composites can be prepared by the vacuum-assisted pressure infiltration process and the thermal conductivity of the composites can be effectively improved by increasing the diamond particle size.

关键词： diamond/aluminum composites thermal conductivity electronic packaging vacuum-assisted pressure infiltration

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Oxygen vacancy self-doped single crystal-like TiO_(2) nanotube arrays for efficient light-driven methane non-oxidative coupling

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Journal of advanced Ceramics 2023年第8期12卷 1577-1592页

作者： Jinbo Xue Jinyu Li Zhe Sun Huimin Li Huan Chang Xuguang Liu Husheng Jia Qi Li Qianqian Shen Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China School of Materials Science and Engineering Southwest Jiaotong UniversityChengdu 610031China

Photocatalytic non-oxidative coupling of methane(PNOCM)is a mild and cost-effective method for the production of multicarbon ***,the separation of photogenerated charges and activation of methane(CH4)are the main challenges for this ***,single crystal-like TiO_(2) nanotubes(VO-p-TNTs)with oxygen vacancies(VO)and preferential orientation were prepared and applied to *** results demonstrate that the significantly enhanced photocatalytic performance is mainly related to the strong synergistic effect between preferential orientation and *** preferential orientation of VO-p-TNT along the[001]direction reduces the formation of complex centers at grain boundaries as the form of interfacial states and potential barriers,which improves the separation and transport of photogenerated ***,VO provides abundant coordination unsaturated sites for CH4 chemisorption and also acts as electron traps to hinder the recombination of electrons and holes,establishing an effective electron transfer channel between the adsorbed CH4 molecule and photocatalyst,thus weakening the C–H *** addition,the introduction of VO broadens the light absorption *** a result,VO-p-TNT exhibits excellent PNOCM performance and provides new insights into catalyst design for CH4 conversion.

关键词： TiO_(2)nanotubes(TNTs) oxygen vacancies(VO) preferential orientation photocatalytic non-oxidative coupling of methane(PNOCM)

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A donor-acceptor conjugated bipolar polymer with multielectron redox sites for long-cycle-life and high-rate aqueous zinc dual-ion batteries

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Journal of Energy Chemistry 2025年第3期102卷 144-150页

作者： Lian-Wei Luo Siteng Zhu Wen Yan Ma Dan Li Chong Zhang Jia-Xing Jiang Key Laboratory of Optoelectronic Chemical Materials and Devices(Ministry of Education) School of Optoelectronic Materials&TechnologyJianghan UniversityWuhan 430056HubeiChina Key Laboratory for Macromolecular Science of Shaanxi Province Shaanxi Engineering Laboratory for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710062ShaanxiChina

Aqueous zinc-ion batteries(AZIBs)have hugely latent advantages in large-scale energy storage due to its innate safety,reasonable price,and ***,most AZIB cathode materials suffer from short cycling life and poor rate ***,a bipolar donor-acceptor(D-A)conjugated microporous polymer(PTZ-BDTB),consisting of electron-withdrawing benzo[1,2-b:4,5-b']dithiophene-4,8-dio ne(BDTB)units and electron-donating phenothiazine(PTZ)units,is developed as the cathode material of aqueous zinc dual-ion batteries(AZDIBs).The D-A type structure design could reduce the band gap,thus promoting electron transfer in the polymer ***,the PTZ-BDTB cathode in a30 mol/kg(m)ZnCl_(2)water-in-salt electrolyte exhibits a high reversible capacity of 202 mA h g^(-1)at0.05 A g^(-1)with excellent rate performance(109 mA h g^(-1)at 15 A g^(-1)),which is far superior to its counterpart polymers PPTZ and ***,PTZ-BDTB shows ultra-stable cycle performance with capacity retention ratios of 76.2%after 460 cycles at 0.05 A g^(-1)and 96%after 27000 cycles at 5 A g^(-1).PTZBDTB also exhibits a low self-discharge ability with capacity retention about 76.4%after resting the battery for 28 *** results demonstrate that D-A type structural design is a promising strategy for constructing high performance cathode materials for AZDIBs.

关键词： Conjugated microporous polymer Donor-acceptor structure Bipolar organic cathode material Aqueous zinc dual-ion batteries

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Facile construction of Mxene-supported niobium hydride nanoparticles toward reversible hydrogen storage in magnesium borohydride

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Rare Metals 2024年第9期43卷 4387-4400页

作者： Ao Xia Jia-Guang Zheng Qing-Bo Zhang Yu-Gang Shu Cheng-Guo Yan Liu-Ting Zhang Zhan-Liang Tao Li-Xin Chen School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

The facile construction of nanoscale NbH_(x)supported by Ti_(3)C_(2)(NbH_(x)@Ti_(3)C_(2))was achieved using facile ball milling strategy to improve the hydrogen desorption kinetics and reversibility of magnesium borohydride(Mg(BH_(4))_(2)).The doping of 30 wt%NbH_(x)@Ti_(3)C_(2)catalyst reduced the onset dehydrogenation temperature of Mg(BH_(4))_(2)to 71.2℃.Additionally,the Mg(BH_(4))_(2)+30NbH_(x)@Ti_(3)C_(2)composite achieved remarkable hydrogen release of over 9.2 wt%at a temperature as low as 230℃,indicating unexpected dehydrogenation ***,the reversibility of NbH_(x)@Ti_(3)C_(2)doped Mg(BH_(4))_(2)was retained to more than 4.2 wt%after four cycles,which was increased by 68%compared to that of undoped Mg(BH_(4))_(2).The strong catalysis of NbH_(x)@Ti_(3)C_(2)catalyst could be attributed to the synergistic effect of NbH_(x)and Ti_(3)C_(2)in hydrogen spillover and ***_(x)acted as a"hydrogen pump"for effective hydrogen spillover,while Ti_(3)C_(2)created numerous diffusion channels for hydrogen dissolution and provided the active catalytic site to facilitate the re/dehydrogenation of Mg(BH_(4))_(2).

关键词： Hydrogen storage Magnesium borohydride Catalysts Mxene

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