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Negative enthalpy alloys and local chemical ordering:a concept and route leading to synergy of strength and ductility

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National Science Review 2024年第4期11卷 172-184页

作者： zibing an Tao Yang Caijuan Shi Shengcheng Mao Lihua Wang Ang Li Wei Li Xianmeng Xue Ming Sun Yifan Bai Yapeng He Fuzeng Ren Zhouguang Lu Ming Yan Yang Ren Chain-Tsuan Liu Ze Zhang Xiaodong Han Beijing Key Lab of Microstructure and Property of Advanced Materials College of Materials Science &Engineering Beijing University of Technology Department of Materials Science and Engineering City University of Hong Kong Key Laboratory of Partial Acceleration Physics& Technology Institute of High Energy PhysicsChinese Academy of Sciences Department of Materials Science &Engineering Southern University of Science and Technology Department of Physics City University of Hong Kong State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University

Solid solutions are ubiquitous in metals and alloys. Local chemical ordering(LCO) is a fundamental sub-nano/nanoscale process that occurs in many solid solutions and can be used as a microstructure to optimize strength and ductility. However, the formation of LCO has not been fully elucidated, let alone how to provide efficient routes for designing LCO to achieve synergistic effects on both superb strength and ductility. Herein, we propose the formation and control of LCO in negative enthalpy alloys. With engineering negative enthalpy in solid solutions, genetic LCO components are formed in negative enthalpy refractory high-entropy alloys(RHEAs). In contrast to conventional ‘trial-and-error' approaches, the control of LCO by using engineering negative enthalpy in RHEAs is instructive and results in superior strength(1160 MPa) and uniform ductility(24.5%) under tension at ambient temperature, which are among the best reported so far. LCO can promote dislocation cross-slip, enhancing the interaction between dislocations and their accumulation at large tensile strains; sustainable strain hardening can thereby be attained to ensure high ductility of the alloy. This work paves the way for new research fields on negative enthalpy solid solutions and alloys for the synergy of strength and ductility as well as new functions.

关键词： negative enthalpy alloys local chemical ordering strength ductility dislocation

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Superb creep lives of Ni-based single crystal superalloy through size effects and strengthening heterostructure γ/γ' interfaces

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National Science Open 2024年第4期 145-155页

作者： Haibo Long Yunsong Zhao Junbo Zhao Xiaoyi Yuan Hao Fan Yushi Luo Wei Li zibing an Shengcheng Mao Gang Liu Xiaodong Han Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of Technology Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Department of Mechanical Engineering Southern University of Science and Technology Department of Materials Science and Engineering Southern University of Science and Technology

This study presents a design strategy to enhance the high-temperature creep resistance of Ni-based superalloys. This strategy focuses on two principles:(1) minimizing the dimensions of γ/γ′ interfaces and γ channels by reducing the size of the γ′phase;(2) key alloy composition control to strengthen the heterostructure γ/γ′ interfaces. This strategy proved very effective by the designed three superalloys' prolonged creep lives. An alloy exhibits ultra-long creep life by 388 h at 1100°C/137 MPa,which runs at the highest level among those alloys without Ru addition. With Ru addition, an alloy that lasted for 748 h with a creep strain of ～6% at 1110°C/137 MPa is developed. This study provides a new route of high-temperature creep lives through heterostructure interfacial design with size effects and key alloying elements.

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Mathematical model and numerical investigation of the influence of spray drying parameters on granule sizes of mold powder

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Particuology 2024年第2期85卷 280-295页

作者： Fei Zhang Youyu Lu Shaoyan Zhu Funian Han Guanghua Wen Ping Tang zibing Hou College of Materials Science and Engineering Chongqing UniversityChongqing400044China Guizhou Academy of Testing and Analysis Guizhou Academy of SciencesGuiyang550014China

In this work,the formation mechanism of the droplet-to-granule was investigated in detail based on mold powder manufacturing.A specific mathematical model of two-stage spray drying was established to describe droplet and granule motion,heat and mass transfer,and granule morphology during spray drying.Then,the relationships between spray drying parameters(inlet temperature,atomization pres-sure,slurry mass flow rate)and the properties of the drying tower(temperature and velocity fields)and mold powder granules(temperature,evaporation rates,moisture content,and diameter)were simulated and calculated using ANSYS/Fluent software.To ensure that the granule size of mold powder was controlled within the ideal range(0.2-0.6 mm)for producing granules with appropriate mechanical and metallurgical properties,the following optimum spray drying parameters were chosen based on the results of the numerical simulation:inlet temperatures,873 K;slurry atomization pressure,1.8 MPa;slurry mass flow rate,0.05 kg s-1.Among these parameters,the slurry mass flow rate has the most significant effect on granule size.

关键词： Mold powder slurry Spray drying parameters Mathematical model Numerical simulation Granule sizes

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Irregular initial solidification by mold thermal monitoring in the continuous casting of steels:A review

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1003-1015页

作者： Qiuping Li Guanghua Wen Fuhang Chen Ping Tang zibing Hou Xinyun Mo College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China

Occasional irregular initial solidification phenomena,including stickers,deep oscillation marks,depressions,and surface cracks of strand shells in continuous casting molds,are important limitations for developing the high-efficiency continuous casting of steels.The application of mold thermal monitoring(MTM) systems,which use thermocouples to detect and respond to temperature variations in molds,has become an effective method to address irregular initial solidification phenomena.Such systems are widely applied in numerous steel companies for sticker breakout prediction.However,monitoring the surface defects of strands remains immature.Hence,indepth research is necessary to utilize the potential advantages and comprehensive monitoring of MTM systems.This paper summarizes what is included in the irregular initial solidification phenomena and systematically reviews the current state of research on these phenomena by the MTM systems.Furthermore,the influences of mold slag behavior on monitoring these phenomena are analyzed.Finally,the remaining problems of the formation mechanisms and investigations of irregular initial solidification phenomena are discussed,and future research directions are proposed.

关键词： irregular initial solidification mold thermal monitoring continuous casting mold slag thermocouple

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Net effect of air pollution controls on health risk in the Beijing-Tianjin-Hebei region during the 2022 winter Olympics and Paralympics

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Journal of Environmental Sciences 2024年第1期135卷 560-569页

作者： Changqing Lin Peter K.K.Louie Alexis K.H.Lau Jimmy C.H.Fung zibing Yuan Minghui Tao Xuguo Zhang Md.Shakhaoat Hossain Chengcai Li Xiang Qian Lao Division of Environment and Sustainability The Hong Kong University of Science and TechnologyHong KongChina Environmental Protection Department Hong Kong Government SARHong KongChina Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong KongChina Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality The Hong Kong University of Science and TechnologyHong KongChina Department of Mathematics The Hong Kong University of Science and TechnologyHong KongChina School of Environment and Energy South China University of TechnologyGuangzhou 510006China Hubei Key Laboratory of Critical Zone Evolution School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China Department of Public Health and Informatics Jahangirnagar UniversityDhaka 1342Bangladesh Department of Atmospheric and Oceanic Sciences School of PhysicsPeking UniversityBeijing 100871China Jockey Club School of Public Health and Primary Care The Chinese University of Hong KongHong KongChina

Due to the non-linearity in ozone(O_(3))formation,reducing the emission of nitrogen oxides(NO_(x))may increase O_(3) concentration.Given the counteractive O_(3) response to NO_(x) reduction,overall impact of air pollution controls can be ambiguous when the assessments focus on the changes in pollutant concentrations.In this study,a risk-based method was used to gauge the net effect of air pollution controls on mortality risk in the Beijing–Tianjin–Hebei(BTH)region during the 2022 Winter Olympics and Paralympics(WOP).This mega-event presents a unique opportunity to investigate the efficacy of deep cuts in pollutant emissions.Results show that O_(3) concentrations greatly increased as nitrogen dioxide(NO_(2))concentrations decreased in the BTH.Due to the active photochemical formations,O_(3) became the dominant pollutant that affected human health during the WOP.Despite the substantial O_(3) increases,the health benefits of NO_(2) reductions overwhelmed the adverse health effects of O_(3) increases in most regions of the BTH(at 81 out of 112 stations).After considering the impacts of particulate matter,the integrated health risk of air pollution mixtures declined almost everywhere in the BTH.Our results underscore the great necessity of changing the assessment paradigm of pollution control from using concentration-based methods to using risk-based methods.Together with the carbon neutrality policy,stringent control of NO_(x)emission from combustion sources is a promising way to achieve synergistic control solutions for air pollution and climate change.

关键词： Ozone Nitrogen dioxide Health risk Carbon neutrality Mega-events

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Extending the solid solution range of sodium ferric pyrophosphate:Off‐stoichiometric Na_(3)Fe(2.5)(P_(2)O_(7))_(2)as a novel cathode for sodium‐ion batteries

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Carbon Energy 2024年第4期6卷 128-139页

作者： Xiang jun Pu Kunran Yang zibing Pan Chunhua Song Yangyang Lai Renjie Li Zheng‐Long Xu Zhongxue Chen Yuliang Cao Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhanChina Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhanChina School of Chemistry and Chemical Engineering Jiangsu University of TechnologyChangzhouJiangsuChina Zonergy Corporation ZigongSichuanChina Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHung HomHong Kong SARChina

Iron‐based pyrophosphates are attractive cathodes for sodium‐ion batteries due to their large framework,cost‐effectiveness,and high energy density.However,the understanding of the crystal structure is scarce and only a limited candidates have been reported so far.In this work,we found for the first time that a continuous solid solution,Na_(4−α)Fe_(2+α)_(2)(P_(2)O_(7))_(2)(0≤α≤1,could be obtained by mutual substitution of cations at center‐symmetric Na3 and Na4 sites while keeping the crystal building blocks of anionic P2O7 unchanged.In particular,a novel off‐stoichiometric Na_(3)Fe(2.5)(P_(2)O_(7))_(2)is thus proposed,and its structure,energy storage mechanism,and electrochemical performance are extensively investigated to unveil the structure–function relationship.The as‐prepared off‐stoichiometric electrode delivers appealing performance with a reversible discharge capacity of 83 mAh g^(−1),a working voltage of 2.9 V(vs.Na^(+)/Na),the retention of 89.2%of the initial capacity after 500 cycles,and enhanced rate capability of 51 mAh g^(−1)at a current density of 1600 mA g^(−1).This research shows that sodium ferric pyrophosphate could form extended solid solution composition and promising phase is concealed in the range of Na_(4−α)Fe_(2+α)_(2)(P_(2)O_(7))_(2),offering more chances for exploration of new cathode materials for the construction of high‐performance SIBs.

关键词： extending solid‐solution range off‐stoichiometric Na_(3)Fe_(2.5)(P_(2)O_(7))_(2) sodium‐ion batteries structure-function relationship

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机载激光武器试验评估技术研究

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应用光学 2024年第3期45卷 507-513页

作者：杜梓冰李晓明中国飞行试验研究院陕西西安710089 复杂航空系统仿真重点实验室北京100076

由于毁伤机理和使用方法的不同,现有机载武器和传感器的试验方法不适用于机载激光武器。为研究其特殊的试验与评估技术,从国外典型机载激光武器的试验情况着手,分析了主要的试验阶段、试验内容、试验类别、管理特点等,对气动光学特性、... 详细信息

由于毁伤机理和使用方法的不同,现有机载武器和传感器的试验方法不适用于机载激光武器。为研究其特殊的试验与评估技术,从国外典型机载激光武器的试验情况着手,分析了主要的试验阶段、试验内容、试验类别、管理特点等,对气动光学特性、出光特性、目标探测识别跟踪、光束控制和杀伤性试验等主要科目的内容、方法进行研究。研究表明,美国为了避免试验技术落后研制技术,采取了多计划安排一体推进、大力构建试验机、建设试验设施和循序渐进开展试验等管理措施促进相关的研究。建议加强试验技术的投入,适时建设体系化试验机,加强测试和靶标等领域的研究,以期为新质武器的成熟和应用提供帮助。

关键词：机载激光武器演示验证飞行试验试验机试验技术

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我国家庭农场的研究进展——基于CiteSacep的可视化分析

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中国农机化学报 2024年第2期45卷 303-310页

作者：张建杰卢紫冰河南财经政法大学农业农村发展学院郑州市450046

为梳理家庭农场相关研究脉络并预测其发展方向,运用CiteSpace软件对CNKI数据库2005—2021年“家庭农场”研究主题的文献进行可视化分析。研究表明该领域发文数量总体呈上升趋势,共经历低水平浮动阶段、快速上升阶段和大幅波动阶段,并在2... 详细信息

为梳理家庭农场相关研究脉络并预测其发展方向,运用CiteSpace软件对CNKI数据库2005—2021年“家庭农场”研究主题的文献进行可视化分析。研究表明该领域发文数量总体呈上升趋势,共经历低水平浮动阶段、快速上升阶段和大幅波动阶段,并在2015年达到发文数量顶峰135篇。通过对作者和机构的文献共被引分析,发现该领域较为稳定的核心作者共15位,以杜志雄、郭熙保和高强分别为首的研究团队具有较强的影响力;就研究机构而言,网络密度为0.0026,科研机构间合作强度较弱、科研水平相差较大,且发文量高的科研机构多集中于农林类高校院系;在家庭农场主题的研究热点上,“家庭农场”“农业社会化服务”“粮食安全”等聚类组合研究倍受研究者的青睐;凸显词探测显示“乡村振兴”凸显强度最高为12.9055,“小农户”“规模经营”“农地流转”“人力资本”等关键词凸显强度紧随其后,这也标志着家庭农场未来的研究方向可能继续由此展开。

关键词：家庭农场 CiteSpace 新型农业经营主体可视化分析

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增强现实眼镜对人眼工作效率和视疲劳影响的研究

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中华眼科杂志 2024年第4期60卷 352-358页

作者：许泽华吴晋芳雷家颖金子兵首都医科大学附属北京同仁医院北京同仁眼科中心、北京市眼科研究所、北京市眼科学与视觉科学重点实验室北京100730

目的探讨使用增强现实眼镜与笔记本电脑在阅读效果和视疲劳方面的差异。方法前瞻性自身对照研究。于2023年11月1至15日在首都医科大学附属北京同仁医院招募长期近距离视物且高频使用笔记本电脑等数字显示设备的健康首都医科大学学生作... 详细信息

目的探讨使用增强现实眼镜与笔记本电脑在阅读效果和视疲劳方面的差异。方法前瞻性自身对照研究。于2023年11月1至15日在首都医科大学附属北京同仁医院招募长期近距离视物且高频使用笔记本电脑等数字显示设备的健康首都医科大学学生作为受试者, 检测视力、双眼视功能(调节、集合、融合功能等)和视疲劳评分(Likert视疲劳量表)。采用抛硬币法确定受试者笔记本电脑和增强现实眼镜的使用顺序, 分别于不同日期的相同时间段检测使用不同设备10 min的阅读效率(阅读速度和错误数字对检出率的乘积), 以及观看20 min视频后的视疲劳评分。采用配对样本t检验和Wilcoxon秩和检验进行统计学分析。结果共纳入20名符合标准的受试者, 男性7名, 女性13名, 年龄为(25.45±2.27)岁。使用增强现实眼镜和笔记本电脑前后, 受试者双眼的远视力均未发生显著变化(均P>0.05)。使用增强现实眼镜的阅读速度和阅读效率[(34.03±9.25)和(29.19±7.62)数字对/min]显著低于使用笔记本电脑[(39.43±10.36)和(35.67±9.87)数字对/min](t=4.36, P<0.001), 但错误数字对检出率差异无统计学意义(t=1.29, P=0.213)。使用2种设备观看视频前的视疲劳评分差异无统计学意义(Z=-0.71, P=0.480), 使用增强现实眼镜观看视频后的视疲劳评分[(20.55±5.04)分]显著高于使用笔记本电脑[16.50(13.00, 19.75)分](Z=-2.85, P=0.004)。使用2种设备观看视频后的视疲劳评分均较观看前显著升高(P<0.05), 其中使用增强现实眼镜的视疲劳评分升高[(6.05±3.50)分]更显著(Z=-3.41, P<0.001)。结论与使用笔记本电脑比较, 使用现有增强现实眼镜进行阅读的速度和效率较低, 使用后视疲劳程度较重, 增强现实眼镜技术尚待进一步优化和改进。

关键词：眼疲劳眼镜阅读效率视敏度

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A novel HfNbTaTiV high-entropy alloy of superior mechanical properties designed on the principle of maximum lattice distortion

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Journal of Materials Science & Technology 2021年第20期79卷 109-117页

作者： zibing an Shengcheng Mao Yinong Liu Li Wang Hao Zhou Bin Gan Ze Zhang Xiaodong Han Beijing Key Lab of Microstructure and Property of Advanced Materials Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing100124China Department of Mechanical Engineering The University of Western AustraliaPerthWA6009Australia Nano and Heterogeneous Structural Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China Beijing Key Laboratory of Advanced High Temperature Materials Central Iron and Steel Research InstituteBeijing100081China State Key Laboratory of Silicon Materials Department of Materials Science and EngineeringZhejiang UniversityHangzhou310058China

This paper reports a synergistic design of high-performance BCC high-entropy alloy based on the combined consideration of the principles of intrinsic ductility of elements,maximum atomic size difference for solid solution strengthening and the valence electron concentration criterion for ductility.The single-phase BCC HfNbTaTiV alloy thus designed exhibited a high compressive yield strength of 1350 MPa and a high compressive ductility of>45%at the room temperature.This represents a 50%increase in yield strength relative to a HfNbTaTiZr alloy.This is attributed to the maximized solid solution strengthening effect caused by lattice distortion,which is estimated to be 1094 MPa.The alloy was also able to retain 53%of its yield strength and 77%of its ductility at 700℃.These properties are superior to those of most refractory BCC high-entropy alloys reported in the literature.

关键词： High-entropy alloy Solid solution strengthening Strengthening mechanism Mechanical properties

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