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Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility

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Journal of Materials Science & Technology 2023年第29期160卷 28-33页

作者： Bo Xiao Jixun Zhang shaofei liu Yilu Zhao Lianyong Xu C.T.liu Tao Yang Department of Materials Science and Engineering Mechanical Behavior Division of Shenyang National Laboratory for Materials ScienceCity University of Hong KongHong KongChina Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong KongChina Hong Kong Institute for Advanced Study City University of Hong KongHong KongChina School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Materials Science and Engineering Tianjin UniversityTianjin 300350China

*** The lasting drive for improved energy efficiency in power gen-eration encourages the innovative design of advanced structural materials with superb mechanical properties[1-6].Among these materials,ordered intermetallic alloys[7-9],as a unique class of metallic materials,have drawn increasing concern from both the scientific and industrial communities due to their intriguing high-temperature properties,strong chemical binding,and low atomic mobility[10,11].However,in light of the insufficient number of slip systems and/or intrinsically weak grain boundary(GB),they are usually brittle at ambient temperature,severely hindering their practical use in engineering systems[12].Previous studies reported that the change in alloy stoichiometry has a significant beneficial effect on the ductility of intermetallic *** instance,liu et al.

关键词： intermetallic ductility alloys

聚酰亚胺纤维/石英纤维混杂增强复合材料的制备及性能研究

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化工新型材料 2024年第8期52卷 106-110页

作者：刘少飞徐鸿杰王占文战佳宇田国峰武德珍江苏先诺新材料科技有限公司常州213149 碳纤维及功能高分子教育部重点实验室北京化工大学北京100029

结合石英纤维(QF)界面性能好、压缩性能优异以及高强高模聚酰亚胺(PI)纤维密度低、模量高的优势,通过层间混杂设计制备了一系列PI/QF混杂增强复合材料,讨论了混杂比和铺层结构对复合材料弯曲性能、压缩性能和介电性能的影响。结果表明:... 详细信息

结合石英纤维(QF)界面性能好、压缩性能优异以及高强高模聚酰亚胺(PI)纤维密度低、模量高的优势,通过层间混杂设计制备了一系列PI/QF混杂增强复合材料,讨论了混杂比和铺层结构对复合材料弯曲性能、压缩性能和介电性能的影响。结果表明:与石英纤维增强复合材料相比,聚酰亚胺增强复合材料具有更为优异的弯曲性能和在小应变下的抗压缩变形能力,但是压缩强度方面仍有不足;混杂增强复合材料均表现出优异的介电性能,介电常数在2.95~3.3之间,介电损耗小于8.0×10^(-3)。

关键词：聚酰亚胺纤维石英纤维混杂复合材料介电性能

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贵州省6种兰科植物新记录

石河子大学学报（自然科学版） 2024年第3期42卷 308-312页

作者：费仕鹏陈正仁刘绍飞熊志斌谭成江吴伟胡国雄贵州茂兰国家级自然保护区管理局贵州荔波558400 贵州大学生命科学院贵州贵阳550025

根据标本鉴定及文献研究,报道了乌来卷瓣兰[Bulbophyllum macraei(Lindl.) Rchb. f.]、小黄花石斛(Dendrobium jenkinsii Lindl.)、叉脊天麻(Gastrodia shimizuana Tuyama)、吻兰[Collabium chinense(Rolfe) T. Tang et F. T. Wang]、无茎盆距兰[Gastrochilus obliquus(Lindl.) Kuntze]和聚叶钗子股(Luisia appressifolia Aver.)等6种分布于茂兰自然保护区的贵州省兰科植物新记录种。这些植物新记录的发现不仅进一步丰富了贵州省兰科植物的物种多样性,对今后进一步研究植物区系具有一定意义。

关键词：荔波茂兰兰科新记录

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Simultaneously improving mechanical properties and oxidation resistance of Ti-bearing high-entropy superalloys at intermediate temperature via silicon addition

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Journal of Materials Science & Technology 2023年第26期157卷 30-41页

作者： shaofei liu Weicheng Xiao Bo Xiao Jiang Ju Yinghao Zhou Yilu Zhao Zengbao Jiao Junhua Luan Qian Li Jinxiong Hou Ji-jung Kai Tao Yang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China Hong Kong Institute for Advanced Study City University of Hong KongHong Kong 999077China

Ti-bearing high-entropy superalloys(HESAs)often suffer from severe intergranular embrittlement and terrible oxidation degradation at intermediate *** we showcase that minor Si addition can effectively mitigate the intergranular embrittlement and improve the oxidation resistance of the a(Ni_(2)Co_(2)FeCr)_(92) Ti_(4)Al_(4) HESA at 700℃ *** analysis revealed that the intergranu-lar G phase induced by 2 at%Si addition can effectively suppress the inward diffusion of oxygen along grain boundaries at 700℃,thus enhancing the tensile ductility of the alloy from∼8.3%to∼13.4%.Be-sides,the 2 at%Si addition facilitated the formation of a continuous Al_(2)O_(3) layer during oxidation,con-tributing to a remarkable reduction in the growth rate of the oxide scale to a quarter of the Si-free *** results demonstrate that Si can be a favorable alloying element to design advanced HESAs with syn-ergistically improved thermal-mechanical performance.

关键词： High-entropy superalloy Mechanical property Oxidation behavior Intermediate temperature Silicon addition

Unveiling strain-enhanced moiréexciton localization in twisted van der Waals homostructures

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Nano Research 2024年第4期17卷 3245-3252页

作者： Henry Rui He Haihong Zheng Biao Wu shaofei Li Junnan Ding Zongwen liu Jian-Tao Wang Anlian Pan Yanping liu Institute of Quantum Physics School of PhysicsCentral South UniversityChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering Hunan UniversityChangsha 410082China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China Shenzhen Research Institute of Central South University Shenzhen 51800China

Moirésuperlattices,arising from the controlled twisting of van der Waals homostructures at specific angles,have emerged as a promising platform for quantum emission ***,the manipulation of strain provides a versatile strategy to finely adjust electronic band structures,enhance exciton luminescence efficiency,and establish a robust foundation for two-dimensional quantum light ***,the intricate interplay between strain and moirépotential remains partially ***,we introduce a meticulously designed fusion of strain engineering and the twisted 2L-WSe_(2)/2L-WSe_(2) homobilayers,resulting in the precise localization of moiré*** low-temperature photoluminescence spectroscopy,we unveil the emergence of highly localized moiré-enhanced emission,characterized by the presence of multiple distinct emission ***,our investigation demonstrates the effective regulation of moirépotential depths through strain engineering,with the potential depths of strained and unstrained regions differing by 91%.By combining both experimental and theoretical approaches,our study elucidates the complex relationship between strain and moirépotential,thereby opening avenues for generating strain-induced moiréexciton single-photon sources.

关键词： moirésuperlattices strain engineering moiréexcitons moirépotential

Unveiling optical anisotropy in disrupted symmetry WSe_(2)/SiP heterostructures

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Nano Research 2024年第9期17卷 8585-8591页

作者： Biqi Hu Xing Xie Xinyu Ouyang Junying Chen shaofei Li Jun He Zongwen liu Jian-Tao Wang Yanping liu Institute of Quantum Physics School of PhysicsCentral South University932 South Lushan RoadChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University932 South Lushan RoadChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518000China

Two-dimensional(2D)transition metal dichalcogenides(TMDs)have garnered considerable attention for their promising applications in sensors and optoelectronic devices,owing to their exceptional optical,electronic,and optoelectronic ***,the inherent high symmetry of TMD lattices imposes limitations on their functional ***,we present a strategy to disrupt the C_(3)rotational symmetry of monolayer WSe_(2)by fabricating a heterostructure incorporating WSe_(2)and SiP *** comprehensive experimental investigations and first-principle calculations,we elucidate that in the WSe_(2)/SiP heterostructure,excitons-both neutral and charged-emanating from WSe_(2)exhibit pronounced anisotropy,which remains robust against temperature ***,we observe an anisotropic ratio reaching up to 1.5,indicating a substantial degree of ***,we demonstrate the tunability of exciton anisotropy through the application of a magnetic field,resulting in a significant reduction in the anisotropic ratio with increasing field strength,from 1.57 to ***,the change in heterojunction anisotropy ratio reaches 24.8%as the magnetic field *** findings elucidate that the perturbation of the C_(3)rotational symmetry of the WSe_(2)monolayer arises from a non-uniform charge density distribution within the layer,exhibiting mirror *** results underscore the potential of heterostructure engineering in tailoring the properties of isotropic materials and provide a promising avenue for advancing the application of anisotropic devices across various fields.

关键词： symmetry breaking heterostructure engineering anisotropy optical spectroscopy

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外包钢混凝土组合梁的变形计算

东北大学学报(自然科学版) 1998年第3期 98-100页

作者： Jiang shaofei,liu Zhiyang

从考虑滑移效应角度出发，探讨了外包钢组合梁的变形计算方法，得出了不同加载条件下简支组合梁的挠度计算公式，并用试验进行了验证，理论计算值与实测结果吻合良好．

关键词：外包钢混凝土组合染滑移效应挠度

Observation of robust anisotropy in WS_(2)/BP heterostructures

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Nano Research 2024年第7期17卷 6749-6756页

作者： Xinran Li Xing Xie Biao Wu Junying Chen shaofei Li Jun He Zongwen liu Jian-Tao Wang Yanping liu Institute of Quantum Physics School of PhysicsCentral South University932 South Lushan RoadChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University932 South Lushan RoadChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518000China

Two-dimensional(2D)anisotropic materials have garnered significant attention in the realm of anisotropic optoelectronic devices due to their remarkable electrical,optical,thermal,and mechanical *** extensive research has delved into the optical and electrical characteristics of these materials,there remains a need for further exploration to identify novel materials and structures capable of fulfilling device requirements under various ***,we employ heterojunction interface engineering with black phosphorus(BP)to disrupt the C_(3) rotational symmetry of monolayer WS_(2).The resulting WS_(2)/BP heterostructure exhibits pronounced anisotropy in exciton emissions,with a measured anisotropic ratio of 1.84 for neutral *** a comprehensive analysis of magnetic-field-dependent and temperature-evolution photoluminescence spectra,we discern varying trends in the polarization ratio,notably observing a substantial anisotropy ratio of 1.94 at a temperature of 1.6 K and a magnetic field of 9 *** dynamic behavior is attributed to the susceptibility of the WS_(2)/BP heterostructure interface strain to fluctuations in magnetic fields and *** findings provide valuable insights into the design of anisotropic optoelectronic devices capable of adaptation to a range of magnetic fields and temperatures,thereby advancing the frontier of material-driven device engineering.

关键词： two-dimensional materials in-plane anisotropy black phosphorus heterojunctions optoelectronic devices photoluminescence spectra

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关于喷油器头部积碳对燃油雾化的影响

时代汽车 2024年第6期 161-163页

作者：刘少飞秦宏宇天津索克汽车试验有限公司天津市300300 中汽研汽车检验中心(天津)有限公司天津市300300

喷油器对燃油的雾化是至关重要的,并且还影响着发动机的节能减排作用。通过试验数据对比,发动机喷油器其雾化效果变化较为明显,且积碳明显可见。通过对燃油雾化的影响分析得出,因在燃烧中产生积碳,并且粘附在喷油器头部,减小喷孔直径和... 详细信息

喷油器对燃油的雾化是至关重要的,并且还影响着发动机的节能减排作用。通过试验数据对比,发动机喷油器其雾化效果变化较为明显,且积碳明显可见。通过对燃油雾化的影响分析得出,因在燃烧中产生积碳,并且粘附在喷油器头部,减小喷孔直径和喷孔数量,对喷油器燃油雾化效果有着直接性的影响,最终因积碳原因致使汽车无法启动,导致发动机故障灯亮,进而引发发动机怠速抖动,不能完全燃烧而产生一系列故障。

关键词：喷油器积碳燃油雾化