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Designing gradient nanograined dual-phase structure in duplex stainless steel for superior strength-ductility synergy

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Journal of Materials Science & Technology 2024年第3期170卷 122-128页

作者： songsong xu Ying Han Jiapeng Sun Guoqing Zu Mingkun Jiang Weiwei Zhu xu Ran Key Laboratory of Advanced Structural Materials Ministry of EducationChangchun University of TechnologyChangchun 130012China School of Materials Science and Engineering Changchun University of TechnologyChangchun 130012China Provincial Key Laboratory of Advanced Materials Processing and Application for Rail Transit Changchun University of TechnologyChangchun 130012China College of Mechanics and Materials Hohai UniversityNanjing 211100China

Similar to other metallic materials,duplex stainless steel dramatically loses its advantage of high ductility as they are ***,we produce a gradient nanograined dual-phase structure in the 2101 duplex stainless steel,thus facilitating a superior strength-ductility synergy:a yield strength of 1009.5 MPa being two times higher than that of the as-received sample,a total elongation of 23.4%and a uniform elongation of 5.9%.This novel structure is produced through a processing route of ultrasonic severe surface rolling and annealing,which realizes a superposition of gradient nanostructure and lamellar dual-phase structure with austenite and *** the tension deformation of gradi-ent nanograined dual-phase structured duplex stainless steel,a significant accumulation of geometrically necessary dislocations *** dislocations are formed to accommodate the deformation incompat-ibility caused by the layer-by-layer difference in strength and hardness of individual phase domains,as well as the inherent difference in properties between the austenite and ferrite *** results in a stronger hetero-deformation induced strengthening and hardening significantly contributing to superior mechanical *** study provides a new avenue to develop advanced steels with high strength and ductility.

关键词： Gradient structure Duplex stainless steel Synergetic strengthening Strength Ductility

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重金属镍对A^(2)/O-BAF系统运行效能的影响及作用机制探究

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水处理技术 2024年第1期50卷 116-121页

作者：谢兴龙徐松松中共云南省委党校(云南行政学院) 云南昆明650111 中国农业大学动物科学技术学院北京100193

针对重金属镍(Ni)对A^(2)/O-生物曝气滤池(BAF)双污泥系统污染物及营养盐去除影响不明确的现状,开展了重金属Ni对双污泥系统对污染物和营养盐去除规律的影响的研究,分析了重金属Ni暴露下双污泥系统内污泥特征的变化规律,解析了微生物群... 详细信息

针对重金属镍(Ni)对A^(2)/O-生物曝气滤池(BAF)双污泥系统污染物及营养盐去除影响不明确的现状,开展了重金属Ni对双污泥系统对污染物和营养盐去除规律的影响的研究,分析了重金属Ni暴露下双污泥系统内污泥特征的变化规律,解析了微生物群落结构对重金属的响应特征。结果表明重金属镍浓度超过2.0 mg/L Ni降低了A^(2)/OBAF双污泥系统对污染物和营养盐的去除能力。重金属Ni刺激了胞外聚合物(EPS)尤其是SB-EPS的分泌,并降低了污泥浓度及有机质占比。微生物群落结果分析表明Ni能改变微生物的群落结构,高浓度Ni降低了Proteobacteria、Actinobacteriota和Bacteroidota的相对丰度,从而降低了双污泥系统对污染物和营养盐的去除。研究结果为双污泥系统处理含Ni废水提供了一定的数据支撑和理论指导。

关键词：双污泥系统重金属镍胞外聚合物微生物群落特征

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Achieving gradient heterogeneous structure in Mg alloy for excellent strength-ductility synergy

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镁合金学报(英文) 2023年第7期11卷 2392-2403页

作者： Jing Han Jiapeng Sun Yuanming Song Bingqian xu Zhenquan Yang songsong xu Ying Han Guosong Wu Jiyun Zhao School of Mechanical and Electrical Engineering China University of Mining and TechnologyXuzhou 221116China College of Mechanics and Materials Hohai UniversityNanjing 211100China Key Laboratory of Advanced Structural Materials Ministry of EducationChangchun University of TechnologyChangchun 130012China

Most metals including Mg alloys have a longstanding dilemma of strength-ductility trade-off,which is hindering their wider *** this study,we propose a gradient heterogeneous grain(GHG)structure for evading this trade-off dilemma and ultrasonic severe surface rolling is attempted to construct this novel structure in ZE41 Mg ***,the GHG structure combine the benefits of gradient structure and heterogeneous grain structure and introduce large microstructural *** to the coarse-grain and heterogeneous-grain structured alloys,the GHG structured one exhibits dramatical enhancement in strength,ductility,and strain hardening *** the best of our knowledge,its strength becomes much higher than that of common ZE41 Mg alloys at no reduction in *** unique mechanical properties stem from not only the individual contribution of the heterogeneous structure components including the fine/ultrafine grains and deformed coarse grains but also their synergistic effect via hetero-deformation induced strengthening and hardening *** summary,our study provides a feasible way to develop new Mg alloys with high strength and good ductility.

关键词： Mg alloy ZE41 Gradient Heterostructure Strength-ductility trade-off

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Anisotropic, biomorphic cellular Si_(3)N_(4) ceramics with directional well-aligned nanowhisker arrays based on wood-mimetic architectures

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Journal of Advanced Ceramics 2022年第4期11卷 656-664页

作者： songsong xu Xiaonan ZHOU Qiang ZHI Junjie GAO Liucheng HAO Zhongqi SHI Bo WANG Jianfeng YANG Kozo ISHIZAKI State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China High Voltage Switchgear Insulation Materials Laboratory of State Grid Pinggao Group Co.Ltd.Pingdingshan 467001China Department of Mechanical Engineering Nagaoka University of TechnologyNagaoka 940-2188Japan

Inspired by the transport behavior of water and ions through the aligned channels in trees,we demonstrate a facile,scalable approach for constructing biomorphic cellular Si_(3)N_(4) ceramic frameworks with well-aligned nanowhisker arrays on the surface of directionally aligned microchannel *** a facile Y(NO_(3))_(3) solution infiltration into wood-derived carbon preforms and subsequent heat treatment,we can faultlessly duplicate the anisotropic wood architectures into free-standing bulk porous Si_(3)N_(4) ***,α-Si3N4 microchannels were synthesized on the surface of CB-templates via carbothermal reduction nitridation(CRN).And then,homogeneous distributed Y–Si–O–N liquid phase on the walls of microchannel facilitated the anisotropicβ-Si3N4 grain growth to form nanowhisker *** dense aligned microchannels with low-tortuosity enable excellent load carrying capacity and thermal conduction through the entire *** a result,the porous Si_(3)N_(4) ceramics exhibited an outstanding thermal conductivity(TC,k_(R)≈6.26 W·m^(−1)·K^(−1)),a superior flexural strength(σ_(L)≈29.4 MPa),and a relative high anisotropic ratio of TC(k_(R)/k_(L)=4.1).The orientation dependence of the microstructure–property relations may offer a promising perspective for the fabrication of multifunctional ceramics.

关键词： silicon nitride anisotropic carbothermal reduction nitridation(CRN) wood nanowhisker arrays

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Characterization and adsorption behaviors of a novel synthesized mesoporous silica coated carbon composite

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Chinese Journal of Chemical Engineering 2016年第1期24卷 190-195页

作者： Sai Wang songsong xu Chengbao Liu Feng Chen Dongtian Wang Shouqing Liu Zhigang Chen Zhengying Wu Jiangsu Key Laboratory for Environment Functional Materials School of Chemistry Biology and Material Engineering Suzhou University of Science and Technology Department of Clinical Oncology the Second Affiliated Hospital of Soochow University

A novel mesoporous silica coated carbon composite(denoted SEG) with hierarchical pore structure has been successfully prepared in an aqueous solution that contains triblock copolymer template, aluminum chloride, siliceous source and expanded graphite. Textural property and morphology of the SEG composite were characterized by the combination of X-ray diffraction, N_2 adsorption–desorption, scanning electron microscopy,transmission electron microscopy and Fourier transform infrared measurements. Results show that mesoporous silica is steadily and uniformly grown on the surface of the graphite slices and the thickness of the silica layer can be finely tuned according to the silica/C molar ratio in the initial reaction solution. This newly synthesized SEG composite shows greatly increased adsorption capacity to methylene blue than the pristine expanded graphite in the batch tests. Both Langmuir and Frendlich models were further used to evaluate the adsorption isotherms of methylene blue over expanded graphite and SEG samples with different silica contents. Finally, pseudosecond-order model was used to describe the kinetics of methylene blue over expanded graphite and the silica-carbon composites.

关键词： Mesoporous silica Expanded graphite Composite Synthesis Adsorption

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Rapid Synthesis and Photoluminescence Properties of Eu-doped ZnO Nanoneedles via Facile Hydrothermal Method

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Chemical Research in Chinese Universities 2014年第4期30卷 538-542页

作者： LANG Jihui WANG Jiaying ZHANG Qi xu songsong HAN Qiang ZHANG Yan ZHAI Hongju CAO Jian YAN Yongsheng YANG Jinghai Scholl of Chemistry and Chemical Engineering Jiangsu University Zhenjiang 212013 P. R. China Institute of Condensed State Physics Key Laboratory of Functional Materials Physics and Chemistry Ministry of Education Jilin Normal University Siping 136000 P. R. China

Eu-doped ZnO nanoneedles with different doping concentrations were prepared via the facile hydrothermal *** crystal structure,morphology and photoluminescence property of the ZnO nanoneedles were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,X-ray photoelectron spectroscopy（XPS）,photoluminescence spectroscopy（PL） and Raman *** results show that the europium ions are incorporated into the crystal lattice of ZnO matrix in trivalent *** nanoneedles are 2-3 μm in length and 100 nm in the tip *** and Raman measurements indicate that higher Eu^3＋ doping concentration may destroy the crystallization of the nanoneedles and decrease the ratio of IUV/IDLE,which is mainly due to the more defects in the doped ZnO *** the characteristic red emissions of Eu^3＋ ions are found by the PL spectroscopy with the Eu^3＋doping concentration increasing,which are attributed to the ^5D0→^7F0,^5D0→^7F1 and ^5D0→^7F2 transitions.

关键词： ZnO nanoneedle Hydrothermal method Europium ion Crystal structure Photoluminescence property

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Effects of holmium and hot-rolling on microstructure and mechanical properties of Mg-Li based alloys

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Journal of Rare Earths 2016年第12期34卷 1269-1276页

作者：穆佳郭浩邹云许松松张中武 Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University

A rare earth holmium（Ho） element was introduced into Mg-8Li-3Al alloy to investigate the effects of holmium and hot-rolling on the microstructure and mechanical properties of the Mg-Li based alloys. Both alloys with and without Ho showed a duplex structure with α and β phases. The as-cast Mg-8Li-3Al alloy exhibited a yield strength（YS） of 111.1 MPa, ultimate tensile strength（UTS） of 148.2 MPa and an elongation of 9.50% while the hot-rolled Mg-8Li-3Al-3Ho alloy had a yield strength of 249.7 MPa, ultimate tensile strength of 293.1 MPa with an elongation of 21.40%. These results indicated that both strength and ductility could be significantly enhanced by addition of holmium together with thermo-mechanical treatment. It was found that the microstructure could be refined significantly and the fracture modes changed from partial brittle to ductile fracture due to the addition of holmium. The effects of microstructure refinement, work hardening and solid solution strengthening induced by the addition of holmium and hot-rolling on the mechanical properties were discussed.

关键词： Mg-Li alloy holmium microstructure grain refinement mechanical properties rare earths

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静电纺丝法制备聚己内酯/石墨烯复合材料纳米纤维

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中国科学技术大学学报 2013年第2期43卷 128-134,150页

作者：许松松闫立峰中国科学技术大学合肥微尺度物质科学国家实验室化学物理系安徽合肥230026

利用静电纺丝方法制备了聚己内酯(PCL)/石墨烯复合纳米纤维,对电纺纳米纤维的表面微观形貌、热性能和力学性能等进行了表征,并研究了石墨烯的加入量、PCL浓度、电纺电压、接收距离等参数对复合纤维性能的影响.研究结果表明:当加入石墨... 详细信息

利用静电纺丝方法制备了聚己内酯(PCL)/石墨烯复合纳米纤维,对电纺纳米纤维的表面微观形貌、热性能和力学性能等进行了表征,并研究了石墨烯的加入量、PCL浓度、电纺电压、接收距离等参数对复合纤维性能的影响.研究结果表明:当加入石墨烯质量分数为0.27%时,得到的电纺纳米纤维的力学性能提高最大,拉伸强度增加48.6%,杨氏模量增加66.0%;当PCL质量分数为11%,电纺电压为28kV,接收距离为35cm,电纺液流速为6mL/h时,电纺过程稳定,可以得到直径均匀的纳米纤维.

关键词：静电纺丝聚己内酯石墨烯纳米纤维

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高强韧面心立方高熵合金的设计

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稀有金属材料与工程 2023年第11期52卷 3981-4001页

作者：袁坤权姜岩刘仕超李新中许松松吴小香苏州大学钢铁学院江苏苏州215137

按照多主元设计理念所制备的高熵合金展现了高强度、高韧性以及良好的耐磨性、耐氧化和热稳定性等优异综合性能,使其有望成为一种优异的新型结构材料。高熵合金在成分设计上可通过调整各主元元素的浓度、添加间隙原子等方式调控合金的... 详细信息

按照多主元设计理念所制备的高熵合金展现了高强度、高韧性以及良好的耐磨性、耐氧化和热稳定性等优异综合性能,使其有望成为一种优异的新型结构材料。高熵合金在成分设计上可通过调整各主元元素的浓度、添加间隙原子等方式调控合金的层错能和微观结构,引入析出强化、细晶强化和相变或孪晶诱导塑性效应等强韧化机制,进而改善合金的综合力学性能。本文主要总结了近年来非等原子比和间隙碳/氮原子添加的成分设计对面心立方高熵合金体系的微观结构、力学性能和变形机制的影响,旨在为新型高性能面心立方高熵合金的设计提供理论基础。

关键词：高熵合金非等原子比设计间隙原子力学性能强化机制

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FCM和ELPSO结合的模糊改进聚类算法研究

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自动化应用 2021年第6期 87-89页

作者：徐嵩松成都工业职业技术学院信息工程学院四川成都610218

模糊C-均值(FCM)是最著名的聚类方法之一,能自动组织各种各样的数据集,获得准确的分类,但它有陷入局部极小值的倾向。现研究一种将FCM与改进的PSO(ELPSO)相结合的混合聚类方法,该方法采用新的增强对数惯性权重策略来便于平衡探索和开发... 详细信息

模糊C-均值(FCM)是最著名的聚类方法之一,能自动组织各种各样的数据集,获得准确的分类,但它有陷入局部极小值的倾向。现研究一种将FCM与改进的PSO(ELPSO)相结合的混合聚类方法,该方法采用新的增强对数惯性权重策略来便于平衡探索和开发。实验结果表明,该方法显著提高了收敛速度和聚类效果,比传统的聚类方法准确率更高。

关键词：模糊C-均值粒子群算法混合聚类

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