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Microstructure evolution and strengthening mechanism of high -performance powder meta.lurgy ta.5 tita.ium alloy by hot rolling

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International Journal of Minerals,Meta.lurgy and Materials 2024年第6期31卷 1426-1436页

作者： ying Gao Ce Zhang Jiazhen Zhang Xin Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsInstitute for Advanced Ma-terials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Engineering Research Center for Advanced Rolling Technology National Engineering Research Center for Flat Rolling EquipmentInstitute of Engin-eering TechnologyUniversity of Science and Technology BeijingBeijing 100083China

Hot deformation of sintered billets by powder meta.lurgy(PM)is an effective preparation technique for tita.ium alloys,which is more significant for high-alloying *** this study,Ti–6.5Al–2Zr–Mo–V(ta.5)tita.ium alloy plates were prepared by cold press-ing sintering combined with high-temperature hot *** microstructure and mechanical properties under different process paramet-ers were *** microscope,electron backscatter diffraction,and others were applied to characterize the microstructure evolution and mechanical properties strengthening *** results showed that the chemical compositions were uniformly dif-fused without segregation during sintering,and the closing of the matrix craters was accelerated by increasing the sintering *** block was hot rolled at 1200℃ with an 80%reduction under only two passes without *** strength and elongation of the plate at 20–25℃ after solution and aging were 1247 MPa and 14.0%,respectively,which were increased by 24.5%and 40.0%,respect-ively,compared with the as-sintered alloy at 1300℃.The microstructure was significantly refined by continuous dynamic recrysta.liza-tion,which was completed by the rota.ion and dislocation absorption of the substructure surrounded by low-angle grain *** hot rolling combined with heat treatment,the strength and plasticity of PM-ta.5 were significantly improved,which resulted from the dense,uniform,and fine recrysta.lization structure and the synergistic effect of multiple slip systems.

关键词： elementa. powder powder meta.lurgy tita.ium alloy hot rolling strength and plasticity

Preface to the special topic on meta.s and their compounds for lithium ion/meta. batteries

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Tungsten 2024年第1期6卷 162-163页

作者： ying-Ze Song Wen-Long Cai Gao-Ran Li Sta.e Key Laboratory of Environment-Friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China College of Materials Science and Engineering Sichuan UniversityChengdu 610064China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

The fast development of electronics and electric devices has inspired the practical application of lithium ion/meta. *** this line,the meta.s and their compounds as electrode materials as well as the corresponding mechanism for energy storage have gained extensive international *** as-organized special topic focuses on W,Mo,Co,Zr,Hf,Re,ta.Nb,V-based meta.s and their compounds for lithium ion/meta. *** special topic involves four reviews and four research papers tota.ly,providing the latest advances of transition meta.s and their related compounds for rechargeable lithium ion/meta. batteries.

关键词： lithium meta.s gained

Impacts of Aggregation Methods and Trophospecies Number on the Structure and Function of Marine Food Webs

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Journal of Ocean University of China 2024年第1期23卷 190-198页

作者： LI Pengcheng ZHANG Chongliang XU Binduo JI Yupeng LI Fan REN Yiping XUE ying Laboratory of Fisheries Ecosystem Monitoring and Assessment College of FisheriesOcean University of ChinaQingdao 266003China Field Observation and Research Sta.ion of Haizhou Bay Fishery Ecosystem Ministry of EducationQingdao 266003China Shandong Marine Resources and Environment Research Institute Shandong Provincial Key Laboratory of Restoration for Marine EcologyYantai 264006China Laboratory for Marine Fisheries Science and Food Production Processes Laoshan LaboratoryQingdao 266237China

Aggregation of species with similar ecological properties is one of the effective methods to simplify food web ***,species aggregation will affect not only the complexity of modeling process but also the accuracy of models’*** of aggregation methods and the number of trophospecies are the keys to study the simplification of food *** this study,three aggregation methods,including ta.onomic aggregation(ta.,structural equivalence aggregation(SEA),and self-organizing maps(SOM),were analyzed and compared with the linear inverse model–Markov Chain Monte Carlo(LIM-MCMC)*** of aggregation methods and trophospecies number on food webs were evaluated based on the robustness and unitless of ecological net-work *** showed that aggregation method of SEA performed better than the other two methods in estimating food web structure and function *** effects of aggregation methods were driven by the differences in species aggregation principles,which will alter food web structure and function through the redistribution of energy *** to the results of mean absolute percenta.e error(MAPE)which can be applied to evaluate the accuracy of the model,we found that MAPE in food web indices will increase with the reducing trophospecies number,and MAPE in food web function indices were smaller and more sta.le than those in food web structure ***,trade-off between simplifying food webs and reflecting the sta.us of ecosystem should be con-sidered in food web *** findings highlight the importa.ce of aggregation methods and trophospecies number in the analy-sis of food web *** study provided a framework to explore the extent to which food web models are affected by dif-ferent species aggregation,and will provide scientific basis for the construction of food webs.

关键词： LIM-MCMC model species aggregation trophospecies number aggregation methods food web indices

Plume-lithosphere interaction in the Comei Large Igneous Province: Evidence from two types of mafic dykes in Gyangze, south Tibet, China

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China Geology 2024年第1期7卷 80-90页

作者： Ya-ying Wang Ling-sen Zeng Li-e Gao Li-long Yan Ling-hao Zhao Jia-hao Gao ying-long Di Guang-xu Li Yi-hong Tian Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China National Research Center for Geoanalysis Chinese Academy of Geological SciencesBeijing 100037China China Nonferrous Meta.s(Guilin)Geology and Mining Co. LtdGuilin 541004China

Two suites of mafic dykes,T1193-A and T1194-A,outcrop in Gyangze area,southeast *** are in the area of Comei LIP and have indistinguishable field occurrences with two other dykes in Gyangze,T0902 dyke with 137.7±1.3 Ma zircon age and T0907 dyke with 142±1.4 Ma zircon age reported by Wang YY et al.(2016),indicating coeval formation *** all the four diabase dykes into consideration,two different types,OIB-type and weak enriched-type,can be ***“OIB-type”samples,including T1193-A and T0907 dykes,show OIB-like geochemical features and have initial Sr-Nd isotopic values similar with most mafic products in Comei Large Igneous Provinces(LIP),suggesting that they represent melts directly generated from the Kerguelen mantle ***“weak enriched-type”samples,including T1194-A and T0902 dykes,have REEs and trace element patterns showing withinplate affinity but have obvious Nb-ta.Ti negative *** show uniform lowerεNd(t)values(−6‒−2)and higher 87Sr/86Sr(t)values(0.706‒0.709)independent of their MgO variation,indicating one enriched mantle *** their closely spatial and temporal relationship with the widespread Comei LIP magmatic products in Tethyan Himalaya,these“weak enriched-type”samples are consistent with mixing of melts from mantle plume and the above ancient Tethyan Himalaya subcontinenta. lithospheric mantle(SCLM)in different *** weak enriched mafic rocks in Comei LIP form one special rock group and most likely suggest large scale hot mantle plume-continenta. lithosphere *** process may lead to strong modification of the Tethyan Himalaya lithosphere in the Early Creta.eous.

关键词： OIB type diabase Comei Large Igneous Province Weakly enriched diabase Plume-lithosphere interaction Nb-ta.Ti negative anomaly Kerguelen plume Geological survey engineering Tibet Plateau

超晶格La-Mg/Y-Ni复合储氢合金晶体结构及性能研究进展

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复合材料学报 2024年第3期41卷 1204-1214页

作者：张晓杰田晓张颖韩家乐杨艳春塔娜内蒙古师范大学物理与电子信息学院呼和浩特010022 内蒙古师范大学稀土功能新能源储能材料内蒙古自治区工程研究中心呼和浩特010022 内蒙古师范大学功能材料物理与化学自治区重点实验室呼和浩特010022

超晶格La-Mg/Y-Ni复合储氢合金具有放电容量大、能量密度高和成本低等优点,是一种重要的氢能存储和转换材料,目前主要用做镍氢电池负极材料和直接硼氢化物燃料电池阳极催化剂。La-Mg-Ni复合合金最初是在La-Ni基储氢合金的基础上,通过用... 详细信息

超晶格La-Mg/Y-Ni复合储氢合金具有放电容量大、能量密度高和成本低等优点,是一种重要的氢能存储和转换材料,目前主要用做镍氢电池负极材料和直接硼氢化物燃料电池阳极催化剂。La-Mg-Ni复合合金最初是在La-Ni基储氢合金的基础上,通过用部分Mg替代La而发展起来的。由于La-Mg-Ni复合合金中金属Mg熔点、沸点低,易挥发,导致采用常规熔炼法很难制备;同时合金中的Mg在碱性电解液中容易腐蚀、氧化,导致合金的循环稳定性差。为克服La-Mg-Ni复合合金制备困难和循环稳定性差等问题,研究者又在La-Ni基储氢合金的基础上,通过用部分Y替代La开发出了La-Y-Ni合金。La-Mg-Ni和La-Y-Ni复合合金具有非常相似的超晶格结构,均能表现出很好的储氢性能,均属于同一类新型超晶格结构储氢合金。本文对La-Mg/Y-Ni储氢合金近20多年的研究成果进行了梳理。本文首先介绍超晶格La-Mg-Ni和La-Y-Ni复合合金的相结构组成及相结构的演变规律,同时分析了Mg元素和Y元素部分替代La元素分别对La-Mg/Y-Ni合金结构和性能的影响,然后讨论了La-Mg/Y-Ni复合合金中的相结构对合金性能的影响。最后,指出了超晶格La-Mg/Y-Ni复合储氢合金未来所面临的挑战和发展方向。

关键词：储氢材料 La-Mg-Ni复合储氢合金 La-Y-Ni复合储氢合金相结构电化学性能

Enhancing energy storage efficiency in lead-free dielectric ceramics through relaxor and lattice strain engineering

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Journal of Materiomics 2024年第6期10卷 1196-1205页

作者： Xuetian Gong Chao Zhang Dong Su Wenrong Xiao Fangjie Cen ying Yang Shenglin Jiang Jing Wang Kanghua Li Guangzu Zhang School of Integrated Circuits Engineering Research Center for Functional Ceramics MOE and Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhanHubei430074China College of Chemnistry and Materials Science Hebei UniversityBaodingHebei071002China Key Lab of Functional Materials for Electronic Information(B) Ministry of EducationWuhanHubei430074China

Dielectric capacitors with high power density and fast charge-discharge speed play an essential role in the development of pulsed power *** increased demands for miniaturization and practicality of pulsed power equipment also necessita.e the development of dielectric materials that possess high energy density while mainta.ning ultrahigh efficiency(η).In particular,ultrahigh efficiency signifies minimal energy loss,which is essential for practical applications but challenging to effectively ***,we demonstrate a strategy of incorporating heterovalent elements into Ba(Zr_(0.1)Ti_(0.9))O_(3),which contributes to achieving relaxor ferroelectric ceramics and reducing lattice strain,thereby improving the comprehensive energy storage ***,optimal energy storage performance is atta.ned in 0.85Ba(Zr_(0.1)Ti_(0.9))O_(3)-0.15Bi(Zn_(2/3)ta.(1/3))O_(3)(BZT-0.15BiZnta.,with an ultrahighηof 97.37%at 440 kV/cm(an advanced level in the lead-free ceramics)and an excellent recoverable energy storage density(Wrec)of 3.74 J/cm^(3).Nota.ly,the BZT-0.15BiZnta.ceramics also exhibit exceptional temperature sta.ility,mainta.ning fluctuations in Wrec within∼10%andηconsistently exceeding 90% across the wide temperature range of−55℃ to 160℃,and under a high electric field of 250 kV/*** these features demonstrate that the relaxor and lattice strain engineering strategies have been successful in achieving high-performance lead-free ceramics,paving the way for designing high-efficiency dielectric capacitors with a wide temperature range.

关键词： Energy storage Relaxor ferroelectrics Lead-free ceramics Lattice strain engineering

Gelation of hole transport layer to improve the sta.ility of perovskite solar cells

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Gelation of hole transport layer to improve the stability of...

第十一届新型太阳能材料科学与技术学术研讨会

作者： ying Zhang Qi Chen Experimenta. Center of Advanced Materials School of Materials Science and EngineeringBeijing Institute of Technology

Conceptually different from traditional approach by merely removing or replacing lithium salts in the spiro-OMeta.,we introduced a novel approach by doping a natural small molecule(thioctic acid,ta..Interestingly,along with the LiTFSI and tBP as additives in the spiro-OMeta.,it forms a HTL *** to the interaction between ta.and LiTFSI,the gelation of HTL is obta.ned via in situ crosslinking,which inhibits the agglomeration of LiTFSI and consequent voids in the *** discover that gelation effectively improves the compactness of resulta.t HTL and prevents moisture and oxygen ***,the gelation of HTL improves not only the conductivity of spiro-OMeta.,but also the operational robustness of the devices in the atmospheric *** addition,ta.passivates the perovskite defects and facilita.es the charge transfer from the perovskite layer to *** a consequence,the optimized PSCs based on the gelated HTL exhibit an improved PCE with excellent device *** unencapsulated devices display superior humidity sta.ility by reta.ning 92% and 85% of their initial PCEs after 2500 hours in ambient air conditions and 1000 hours high humidity test at 85% relative humidity(RH),*** gelation of HTL,it provides a new avenue to the sta.le doping of HTL,which would enlighten the commercialization of PSCs in the future.

关键词： Perovskite solar cell Hole transport layer Gelation Humidity sta.ility Aggregation of LiTFSI

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基于光声谱分析的大鼠慢性前列腺炎评价

声学学报 2024年第3期49卷 424-430页

作者：王憧朱云开董琪李博艺封婷李颖陈亚青他得安复旦大学信息科学与工程学院生物医学工程系上海200438 上海交通大学医学院附属新华医院上海200092 复旦大学工程与应用技术研究院生物医学工程技术研究所上海200433

探究了使用光声谱参数评价慢性前列腺炎的可行性。通过对大鼠注射弗氏完全佐剂构建大鼠慢性前列腺炎症模型,使用光声显微仪器扫描前列腺组织切片获取原始光声信号。计算信号的功率谱参数(斜率、截距、平均谱功率和频谱质心偏移量),对获... 详细信息

探究了使用光声谱参数评价慢性前列腺炎的可行性。通过对大鼠注射弗氏完全佐剂构建大鼠慢性前列腺炎症模型,使用光声显微仪器扫描前列腺组织切片获取原始光声信号。计算信号的功率谱参数(斜率、截距、平均谱功率和频谱质心偏移量),对获得的谱参数进行了分析统计和参数成像,并讨论了不同频带的选择对评价结果的影响。实验结果表明,炎症组织与正常组织谱参数的统计结果和成像结果均存在显著性差异,使用频谱质心偏移量(SCS)成像可以区分炎症组织和正常组织,且在带宽固定的情况下,斜率参数和平均谱功率参数分别在高频谱段和低频谱段成像结果清晰,不同频带对截距参数成像的影响较小。

关键词：光声显微光声谱分析前列腺炎组织表征

Unveiling the secrets of diatom-mediated calcification:Implications for the biological pump

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Science China Earth Sciences 2024年第9期67卷 2895-2909页

作者： Yiwen PAN Yifan LI Chen-Tung Arthur CHEN Zong-Pei JIANG Wei-Jun CAI Yunwen SHEN Zesheng DING Qixian CHEN Yanan DI Wei FAN Chenba ZHU ying CHEN Ocean College Zhejiang UniversityZhoushan 316021China Hainan Institute of Zhejiang University Sanya 570203China Department of Oceanography Sun Yat-Sen UniversityGaoxiong 80424China School of Marine Science and Policy University of DelawareNewark DE 19716USA Carbon Neutral Innovation Research Center Xiamen UniversityXiamen 361005China

Siliceous diatoms are one of the most prominent actors in the oceans,and they account for approximately 40%of the primary production and particulate organic carbon export *** is believed that changes in carbon flux caused by variations in diatom distribution can lead to significant climate *** the fundamenta. pathways of diatom-driven carbon sequestration have long been esta.lished,there are no reports of CaCO_(3) precipita.ion induced by marine diatom *** manuscript introduces novel deta.ls regarding the enhancement of aragonite precipita.ion during photosynthesis in Skeletonema costa.um in both artificial and natural *** direct measurements of cell surfaces via a pH microelectrode and zeta.potential analyzer,it was determined that the diatom-mediated promotion of CaCO_(3) precipita.ion is achieved through the creation of specific microenvironments with concentrated[CO_(3)^(2-)]and[Ca^(2+)]and/or the dehydrating effect of adsorbed Ca^(2+).Based on this mechanism,it is highly plausible that diatom-mediated calcification could occur in the oceans,an assertion that was supported by the significant deviation of tota. alkalinity(ta.from the conservative ta.salinity mixing line during a Skeletonema costa.um bloom in the East China Sea and other similar *** newly discovered calcification pathway esta.lishes a link between particulate inorganic and organic carbon flux and thus helps in the reassessment of marine carbon export fluxes and CO_(2) sequestration *** discovery may have importa.t ramifications for assessing marine carbon cycling and predicting the potential effects of future ocean acidification.

关键词： Diatom bloom Skeletonema costa.um Calcification Biological carbon pump Counter carbonate pump