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γ"variant-sensitive deformation behaviour of Inconel 718 superalloy

Journal of Materials Science & Technology 2022年第31期126卷 169-181页

作者： R.Y.zhang H.L.Qin z.n.bi Y.T.Tang J.Araújo de Oliveira T.L.Lee C.Panwisawas S.Y.zhang J.zhang J.Li H.B.Dong Centre of Excellence for Advanced Materials Dongguan 523808China School of Engineering University of LeicesterUniversity RoadLeicester LE17RHUnited Kingdom Beijing Key Laboratory of Advanced High Temperature Materials Central Iron and Steel Research InstituteBeijing 100081China Department of Materials University of OxfordParks RoadOxford OX13PHUnited Kingdom StressMap Engineering and Innovation DepartmentThe Open UniversityWalton HallMilton Keynes MK76AAUnited Kingdom ISIS neutron Source Rutherford Appleton LaboratoryHarwell Science and Innovation CampusChiltonOxfordshire OX110QXUnited Kingdom School of Material Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Strengthening in Inconel 718 superalloy is derived from dislocation interaction withγ"precipitates,which exist in disk-shaped three possible orientation variants with their{100}habit plane normal to each *** interactions between dislocations andγ"precipitates vary according to theγ"orienta-tion variants,which makes the deformation behaviour complicated and difficult to reveal *** this work,γ"variant distributions of Inconel 718 samples were tailored by ageing heat treatment under either tensile or compressive ***γ"variant-sensitive deformation behaviours were then studied by in situ tensile tests via neutron diffraction at room *** is demonstrated that yield-ing first takes place in grains oriented withparallel to the loading *** identical lattice strain response to applied stress of both theγmatrix and theγ"precipitates was observed during yield-ing,suggesting that dislocations shearing through theγ"precipitates is predominant at this ***-ations in yield strength for samples with differentγ"variant distributions were observed,which can be attributed to different strengthening that arises from interactions between dislocation and differentγ"variants.

关键词： ni-base superalloys Precipitation strengthening neutron diffraction Lattice strains Plastic deformation

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Dispersion and Damage of Carbon nanotubes in Carbon nanotube/7055Al Composites During High-Energy Ball Milling Process

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Acta Metallurgica Sinica(English Letters) 2021年第2期34卷 196-204页

作者： S.bi B.L.Xiao z.H.Ji B.S.Liu z.Y.Liu z.Y.Ma Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Material Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China AVIC Manufacturing Technology Institute Beijing 100024China

High-energy ball milling(HEBM)combined with powder metallurgy route was used to fabricate carbon nanotube(CnT)reinforced 7055 Al *** powder morphology evolution processes(HEBM-1 and HEBM-2)were designed to investigate the dispersion and damage of CnTs during HEBM ***-1 evolution process involved powder fl attening,cold-welding and fracture,while HEBM-2 evolution process consisted of powder fl attening and *** HEBM-1,the repetitive fracture and cold-welding process was effective for dispersing ***,the powder fl attening process in HEBM-2 was unsuccessful in dispersing CnTs due to two reasons:(1)the thickness of fl aky Al powders exceeded the critical value,and(2)the clustered CnTs embedded in fl aky Al powders could not be *** of the broadening of D band and the appearance of a new defect-related D’band,product of I D/I G and full width half maximum of D band,rather than I D/I G,was used to evaluate the actual damage of *** indicates that the damage of CnTs was severe in powder fl attening and fracture stages,while the damage of CnTs was small in powder cold-welding stage.

关键词： Metal matrix composites Carbon nanotubes Powder evolution Dispersion and damage Powder metallurgy

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Cutting Behavior of Cortical Bone in Different Bone Osteon Cutting Angles and Depths of Cut

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Chinese Journal of Mechanical Engineering 2022年第3期35卷 80-91页

作者： Yuanqiang Luo Yinghui Ren Yang Shu Cong Mao zhixiong zhou z.M.bi College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China Department of Civil and Mechanical Engineering Purdue University Fort WayneFort WayneIN 46805USA

Cortical bone is semi-brittle and anisotropic,that brings a challenge to suppress vibration and avoid undesired fracture in precise cutting process in *** this paper,a novel analytical model is proposed to represent cortical bone cutting *** model is utilized to predict the chip formations,material removal behavior and cracks propagation under varying bone osteon cutting angles and *** of orthogonal cutting experiments were conducted on cortical bone to investigate the impact of bone osteon cutting angle and depth of cut on cutting force,crack initialization and *** observed chip morphology highly agreed with the prediction of chip formation based on the analytical *** curly,serrated,grainy and powdery chips formed when the cutting angle was set as 0°,60°,90°,and 120°,*** bone were removed dominantly by shearing at a small depth of cut from 10 to 50μm,and by a mixture of pealing,shearing,fracture and crushing at a large depth of cut over 100μm at different bone osteon ***,its fracture toughness was calculated based on measured cutting *** is found that the fluctuation of cutting force is suppressed and the bone material becomes easy to remove,which attributes to lower fracture toughness at bone osteon cutting angle 0°.When the cutting direction develops a certain angle to bone osteon,the fracture toughness increases then the crack propagation is inhibited to some extent and the fluctuation of cutting force comparatively *** is a theoretical and practical significance for tools design and operational parameters choice in surgeries.

关键词： Bone cutting surgery Orthogonal cutting models Anisotropic materials Chip formation Crack initialization and propagation Fracture toughness

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Microstructure evolution and hot deformation behavior of carbon nanotube reinforced 2009Al composite with bimodal grain structure

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Journal of Materials Science & Technology 2021年第11期70卷 73-82页

作者： K.Ma z.Y.Liu S.bi X.X.zhang B.L.Xiao z.Y.Ma Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of ScienceShenyang110016China School of Materials Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang110016China School of Materials Science and Engineering Guilin University of TechnologyGuilin541004China

The hot deformation behaviors of the bimodal carbon nanotube reinforced 2009Al(CnT/2009Al)composite were studied by establishing processing map and characterizing the microstructure *** results indicate that the grain size in the ultra-fine grained zones was stable during hot deformation,while the coarse grained zones were elongated with their long axis directions tending to be perpendicular to the compression *** temperature with high strain rate(LTHR),as well as high temperature with low strain rate(HTLR)could increase the length/width ratio of the coarse grained ***,LTHR and HTLR could cause the instable *** instable deformation at LTHR was induced by severe intragranular plastic deformation and the localized shear crack,while the instable deformation at HTLR resulted from the more deformation component at the coarse grained zones,and the micro-pore initiation due to CnT re-agglomeration at the boundaries between the coarse and the ultra-fine grained zones.

关键词： Carbon nanotube bimodal Aluminum matrix composite Hot deformation Processing map

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Experimental study of compressible boundary layer on a cone at angles of attack

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Acta Mechanica Sinica 2009年第3期25卷 325-333页

作者： A.Maslov D.Bountin A.Shiplyuk A.Sidorenko Q.Shen z.bi Khristianovich Institute of Theoretical and Applied Mechanics(ITAM)and novosibirsk State University China Academy of Aerospace Aerodynamics(CAAA)

Experimental study was conducted for boundarylayers on a sharp 5° half-angle cone of 400mm length at angles of attack. The model was tested in the T-326 hypersonic wind tunnel （ITAM） at freestream Mach number M = 5.95. Mean and fluctuation wall characteristics of the boundary layer are measured at 0°, 2°, 3° and 4° angles of attack for different stagnation pressures. Pulsation measurements are carried out by means of ALTP sensor. Pressure and temperature distributions along the model are obtained, and transition beginning and end locations have been found. Boundary layer stabilization with the increase of angle of attack and the decrease of stagnation pressure is observed. High frequency pulsations inherent to hypersonic boundary layer （second mode） have been detected.

关键词： Compressible boundary layer Transition,Experimental study

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Slip effects on streamline topologies and their bifurcations for peristaltic flows of a viscous fluid

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Chinese Physics B 2014年第6期23卷 341-352页

作者： z.Asghar n.Ali Department of Mathematics and Statistics International Islamic University

We discuss the effects of the surface slip on streamline patterns and their bifurcations for the peristaltic transport of a newtonian fluid. The flow is in a two-dimensional symmetric channel or an axisymmetric tube. An exact expression for the stream function is obtained in the wave frame under the assumptions of long wavelength and low Reynolds number for both cases. For the discussion of the particle path in the wave frame, a system of nonlinear autonomous differential equations is established and the methods of dynamical systems are used to discuss the local bifurcations and their topological changes. Moreover, all types of bifurcations and their topological changes are discussed graphically. Finally, the global bifurcation diagram is used to summarize the bifurcations.

关键词： viscous fluid slip condition streamline topologies bifurcation

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Role of ultrasound in colorectal diseases

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World Journal of Gastroenterology 2016年第43期22卷 9477-9487页

作者： Renáta Bor Anna Fábián zoltán Szepes First Department of Medicine University of Szeged

Ultrasound is an undervalued non-invasive examination in the diagnosis of colonic diseases. It has been replaced by the considerably more expensive magnetic resonance imaging and computed tomography, despite the fact that, as first examination, it can usefully supplement the diagnostic process. Transabdominal ultrasound can provide quick information about bowel status and help in the choice of adequate further examinations and treatment. Ultrasonography,as a screening imaging modality in asymptomatic patients can identify several colonic diseases such as diverticulosis, inflammatory bowel disease or cancer. In addition, it is widely available, cheap, non-invasive technique without the use of ionizing radiation, therefore it is safe to use in childhood or during pregnancy, and can be repeated at any time. new ultrasound techniques such as elastography, contrast enhanced and Doppler ultrasound, miniprobes rectal and transperineal ultrasonography have broadened the indication. It gives an overview of the methodology of various ultrasound examinations, presents the morphology of normal bowel wall and the typical changes in different colonic diseases. We will pay particular attention to rectal and transperineal ultrasound because of their outstanding significance in the diagnosis of rectal and perineal disorders. This article seeks to overview the diagnostic impact and correct indications of bowel ultrasound.

关键词： Ultrasound Perineal ultrasound Rectal endosonography Gastrointestinal diseases

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ROBUST H∞ COnTROL FOR UnCERTAIn nOnLInEAR SYSTEMS

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Journal of Systems Science & Complexity 2007年第4期20卷 545-553页

作者： Weiping bi College of Mathematics and Information Science Henan Normal University Xinxiang 453007. China

This paper studies the robust H∞ disturbance attenuation with internal stability for uncertain nonlinear control systems. By adding one power integrator technique, this paper designs a explicit smooth robust dynamic feedback law while rejecting the disturbance to any specified degree of accuracy. Further, the example and simulation results show the effectiveness of the proposed schemes.

关键词： Internal stability robust dynamic feedback specified degree.

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Opportunities and challenges of biodegradable zn-based alloys

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Journal of Materials Science & Technology 2020年第11期42卷 136-138页

作者： H.F.Li z.z.Shi L.n.Wang Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China

Following the footsteps of biodegradable Mg-based and Fe-based alloys,biodegradable zn-based alloy is a newcomer and rising star in the family of biodegradable metals and *** combined superior mechanical properties,appropriate degradation rates,excellent biocompatibility of biodegradable zn-based alloys have brought worldwide research interest on the design,development and clinical translation of zn-based *** present perspective has summarized opportunities and challenges in the development of biodegradable zn-based alloys.

关键词： biodegradable zn-based alloys Clinical applications Mechanical properties Degradation behavior biocompatibility Corrosion fatigue bio-tribocorrosion

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Fluoroalkyl n-sulfonyl hydrazones:An efficient reagent for the synthesis of fluoroalkylated compounds

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Science China Chemistry 2021年第10期64卷 1614-1629页

作者： Paramasivam Sivagur Xihe bi Department of Chemistry Northeast Normal UniversityChangchun 130024China

Fluoroalkyl n-sulfonyl hydrazones are versatile reagents that can be used to synthesize a wide range of diverse fluoroalkylated organic *** it has been known since 1975,the chemistry of fluoroalkyl n-sulfonyl hydrazones has recently only received great attention from the scientific ***,they are used as either safe and bench-stable diazo precursors in carbene transfer reactions or as 1,3-dipoles in cycloaddition and cyclization ***,fluoroalkyl n-sulfonyl hydrazones to replace toxic fluoroalkyl diazo compounds in carbene transfer reactions reduce the risk of rapid accumulation of explosive diazo compounds and improve functional group compatibility and substrate *** the growing importance of fluoroalkyl n-sulfonyl hydrazones in chemical synthesis,a comprehensive review of this topic in the literature is essential to demonstrate their synthetic *** this review,we critically summarize and comprehensively analyze the publications in various literatures on the chemistry of fluoroalkyl n-sulfonyl hydrazones starting from 1990 to *** classification of the different reactivity profiles of fluoroalkyl n-sulfonyl hydrazones and the efficiencies of similar types of reactions or substrates with fluoroalkyl diazo compounds are compared.

关键词： An efficient reagent for the synthesis of fluoroalkylated compounds Fluoroalkyl n-sulfonyl hydrazones

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