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Gradient microstructure,recrystallization and mechanical properties of copper processed by high pressure surface rolling

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Journal of Materials Science & Technology 2022年第31期126卷 182-190页

作者： J.Guo q.Y.He q.S.Mei X.Huang G.L.Wu o.V.Mishin college of Materials Science and Engineering Chongqing UniversityChongqing400045China Southwest Technology and Engineering Research Institute Chongqing 400039China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China Beijing Advanced Innovation center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering Technical University of Denmark2800 Kgs.LyngbyDenmark

The microstructure,hardness and tensile properties have been studied in copper processed by high pressure surface rolling(HPSR)both in the as-deformed condition and after subsequent annealing at 150℃.It is found that a gradient structure with significant differences in the scale of microstructural features is formed by *** deformed microstructure varies from nano-and ultrafine-scale structures with a large fraction of high angle boundaries near the surface to lightly deformed grains at depths of 1-3 mm below the *** tests of 1-mm-thick specimens demonstrate that the asdeformed material has a high strength and a low uniform *** at 150℃results in partial recrystallization,which creates new through-thickness *** for the topmost layer and several bands in the adjacent layer,recrystallization is more pronounced close to the *** fraction recrystallized is at least 80%at depths of 60-300μm after annealing for 960 *** fraction recrystallized in the subsurface decreases with increasing depth,and the deformed layer at depths greater than 500μm re-mains largely non-recrystallized after *** partially recrystallized condition demonstrates an improved combination of strength and ductility.

关键词： High pressure surface rolling copper Gradient microstructure Annealing Hardness Strength Ductility

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Experimental study of the effect of wear parameters on the wear behavior of A356 alloy/cow horn particulate composites

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Defence Technology（防务技术） 2018年第1期14卷 77-82页

作者： B.q.ochieze c.c.Nwobi-okoye P.N.Atamuo Lafarge Africa Plc Mfamosing Plant Department of Mechanical Engineering Chukwuemeka Odumegwu Ojukwu University

Experimental study of the effect of wear parameters on the wear behaviour of A356 alloy reinforced with cow horn particles(cHp) produced by spark plasma sintering was investigated. Experiments were conducted based on the plan of experiments generated through Taguchi's(L9) technique. Tribometer was used for the wear test and Scanning electron microscope was used to analyse the worn scar of the samples. The results shows that, A356 alloy reinforced with cHp exhibited better dry sliding wear resistance than the unreinforced alloy. Wear rate decreased as the amount of cHp reinforcement increased in the matrix. It was found that, the optimum level of the factors with minimized the wear loss were obtained at: wt%cHp(20%), applied load(10 N), sliding velocity(3 m/s) and sliding distance(2000 m). It can be seen that the wear track of the sample are(D ? 0.81 and L = 42.85 mm) and(D ? 0.54 and L= 27.03 mm) for A356 alloy and composites at optimum condition respectively. The results showed that the addition of cow horn particles as reinforcing materials in A356 alloy composites increased the wear resistance of the composites greatly.

关键词： A356alloy cow horn particles Microstructure Analysis of variance and wear behaviour

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correlation between test temperature, applied load and wear transition of Mg97Zn1Y2 alloy

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Journal of Magnesium and Alloys 2021年第2期9卷 592-603页

作者： J.An Y.X.Tian c.q.Feng Key Laboratory of Automobile Materials Ministry of EducationDepartment of Materials Science and EngineeringJilin UniversityChangchun 130025PR China

Dry sliding wear tests were performed on Mg97 Zn1 Y2 alloy at various temperatures of 20,50,100,150 and 200°c using a pin-on-disc wear testing machine in order to reveal mild-severe(M-S)wear transition mechanism during elevated-temperature wear *** was shown that at each test temperature,the wear rate increased with increasing load,and all wear rate-load curves demonstrated two distinct stages *** and severe wear *** predominant wear mechanisms operating in mild and severe wear stages were analyzed,and they were indicated in the mild and severe wear regimes of a wear mechanism transition map,respectively.M-S wear transition mechanism was analyzed by comparison of microstructure transformation and hardness change in subsurfaces of samples tested in mild and severe wear stages,from which M-S wear transition mechanism was confirmed as softening of surface material arising from dynamic recrystallization(DRX)microstructure *** M-S wear transition load was found to have a linear relationship with test temperature,and decreased with rising test temperature.M-S wear transition obeyed a critical surface DRX temperature(SDT)criterion under given conditions,and the transition loads were estimated at various test temperatures by using the criterion.

关键词： Mg-alloys Elevated temperatures Wear rate Wear mechanism Wear transition

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Diffusion behavior at void tip and its contributions to void shrinkage during solid-state bonding

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Journal of Materials Science & Technology 2018年第8期34卷 1449-1454页

作者： c.Zhang M.q.Li H.Li School of Materials Science and Engineering Northwestern Polytechnical University State Key Laboratory of Solidification Processing Northwestern Polytechnical University Department of Mechanical Engineering University de Lyon

Solid-state diffusion bonding is an advanced joining technique, which has been widely used to join similar or dissimilar materials. Generally, it is easy to observe the diffusion behavior during dissimilar bonding, but for similar bonding the diffusion behavior has yet been observed via experiments. In this study, the diffusion behavior at void tip was firstly observed during similar bonding of stainless steel. Scanning electron microscopy with energy dispersive spectroscopy was used to examine the interface charac- teristic and diffusion behavior. The results showed that a diffusion region was discovered at void tip. Element concentrations of diffusion region were more than those of void region, but less than those of bonded region. This behavior indicated that the diffusion was ongoing at void tip, but the perfect bond has yet formed. The diffusion region was attributed to the interface diffusion from adjacent region to void tip due to the stress gradient along bonding interface. The mass accumulation at void tip transformed the sharp void tip into smooth one at the beginning of void shrinkage, and then resulted in shorter voids.

关键词： Stainless steel Micro-void morphology Solid-state bonding Void tip Element diffusion

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Automotive revolution and carbon neutrality

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Frontiers in Energy 2023年第6期17卷 693-703页

作者： c.c.cHAN Wei HAN Hanlei TIAN Yanbing LIU Tianlu MA c.q.JIANG Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina Sustainable Energy and Environment Thrust Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511453China Department of Electronic and computer Engineering Hong Kong University of Science and TechnologyHong KongChina Department of Electrical Engineering City University of Hong KongHong KongChina HKUST Shenzhen-Hong Kong collaborative Innovation Research Institute Shenzhen 518048China

The automotive industry is in the midst of a groundbreaking revolution,driven by the imperative to achieve intelligent driving and carbon neutrality.A crucial aspect of this transformation is the transition to electric vehicles(EVs),which necessitates widespread changes throughout the entire automotive *** paper examines the challenges and opportunities of this transition,including automotive electrification,intelligence-connected transportation system,and the potential for new technologies such as hydrogen fuel ***,it discusses the key technologies and progress of the hydrogen energy industry chain in the upstream hydrogen production,midstream hydrogen storage and transportation,downstream hydrogen station construction and hydrogen fuel cells in ***,it proposes the directions for future layout,providing guidance for future development.

关键词： automotive revolution electric vehicles(EVs) hydrogen energy fuel cell

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Snap-through of an elastica under bilateral displacement control at a material point

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Acta Mechanica Sinica 2020年第3期36卷 727-734页

作者： q.Wang H.L.Zou Z.c.Deng Department of Engineering Mechanics Northwestern Polytechnical UniversityXi'an 710072China

Snap-through phenomenon widely occurs for elastic systems,where the systems lose stability at critical *** snapthrough of an elastica under bilateral displacement control at a material point is studied,by regarding the whole elastica as two components,i.e.,pinned-clamped ***,stiffness-curvature curves of two pinned-clamped elasticas are firstly efficiently located based on the second-order mode,which are used to determine the shapes of two *** transformations are used to assemble two components together to form the whole elastica,which reveals four kinds of *** advantage of this way compared with other methods such as the shooting method is that multiple coexisting solutions can be located accurately.o n the load-deflection curves,four branches correspond to four kinds of shapes and first two branches are symmetrical to the last two branches relative to the original *** the bilateral displacement control,the critical points can only appear at saddle-node bifurcations,which is different to that for the unilateral displacement ***,one critical point is found on the first branch and two critical points are found on the secondary *** addition,the snap-through among different branches can be well explained with these critical points.

关键词： Elastica Snap-through critical points Buckling Displacement control

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characterization of face-centered cubic structure and deformation mechanisms in high energy shot peening process of Tc17

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Journal of Materials Science & Technology 2022年第15期110卷 136-151页

作者： c.Yang M.q.Li Y.G.Liu School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China

The face-centered cubic structure(fcc)and its deformation behaviors,as well as the distinctive role of fcc-Ti in nanocrystallization in Tc17 subjected to high energy shot peening(HESP),were investigated by using comprehensive high-resolution transmission electron microscopy(HRTEM).The results showed that there was a stress-induced fcc-Ti in Tc17 with a lattice constant of 0.420–0.433 nm and the B-type orientation relationship between the hcp-Ti and the fcc-Ti as[2-1-10]_(hcp)//[-110]_(fcc)and(0001)_(hcp)//(111)_(fcc),which was accomplished by the gliding of Shockley partial dislocations with Burgers vector of 1/3[01-10]on the basal *** deformation twinning dominated the subsequent deformation of fcc-Ti,producing two types of{111}twins with different *** them,the I-type twin with complete structure was generated by successive gliding of Shockley partial dislocations with the same Burgers vector of 1/6[11-2].In contrast,the cooperative slip of three Shockley partials,whose sum of Burgers vectors was equal to zero,produced the II-type twin with zero net macroscopic *** then,the emission of Shockley partial with the Burgers vector of 1/6[11-2]on every three(111)fccplanes resulted in the formation of a 9R *** to the dissociation effect of lamellar fcc-Ti and the superior deformation ability of fcc structure,the occurrence of fcc-Ti effectively promoted surface nanocrystallization of Tc17.

关键词： Tc17 Severe plastic deformation Stress-induced phase transformation Deformation twinning Nanocrystallization

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Geometrical shape of in-plane inclusion characterized by polynomial internal stress field under uniform eigenstrains

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Applied Mathematics and Mechanics(English Edition) 2016年第9期37卷 1113-1130页

作者： Jian WU c.q.RU Liang ZHANG Ling WAN college of Aerospace Engineering Chongqing University Department of Mechanical Engineering University of Alberta State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology

The internal stress field of an inhomogeneous or homogeneous inclusion in an infinite elastic plane under uniform stress-free eigenstrains is studied. The study is restricted to the inclusion shapes defined by the polynomial mapping functions mapping the exterior of the inclusion onto the exterior of a unit circle. The inclusion shapes, giving a polynomial internal stress field, are determined for three types of inclusions, i.e., an inhomogeneous inclusion with an elastic modulus different from the surrounding matrix, an inhomogeneous inclusion with the same shear modulus but a different Poisson＇s ratio from the surrounding matrix, and a homogeneous inclusion with the same elastic modulus as the surrounding matrix. Examples are presented, and several specific conclusions are achieved for the relation between the degree of the polynomial internal stress field and the degree of the mapping function defining the inclusion shape.

关键词： inclusion shape internal stress field eigenstrain polynomial

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crack Initiation Mechanism of Z3cN20.09M Duplex Stainless Steel during corrosion Fatigue in Water and Air at 290 °c

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Journal of Materials Science & Technology 2015年第11期31卷 1144-1150页

作者： H.c.Wu B.Yang Y.Z.Shi q.Gao Y.q.Wang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing collaborative Innovation center of Universal Iron & Steel Technology School of Materials Science and Engineering Anhui University of Technology

The crack initiation mechanism of a Z3cN20.09M duplex stainless steel （DSS） during corrosion fatigue （cF） in water and air at 290 ℃ was investigated by using a cF cracking machine and a scanning electron microscopy （SEM）. The cracks were initiated successively at the persistent stip bands （PSBs）, phase boundaries （PBs） and pitting corrosion points （PcPs） of the specimens when they were tested in water at 290 ℃, while in airat 290 ℃ the cracks were only initiated at the PSBs and PBs. And the cracks were found mainly to initiate at the PSBs and PBs when the specimens were tested in water and air at 290 ℃, respectively. The results also reveal that the cracks were likely to be initiated at the first 20% of fatigue life of the specimens tested in water at 290 ℃. However, the cracks were not found until 50% of fatigue life when tested in air at 290 ℃. Moreover, the crack numbers of the specimens tested in water at 290 ℃ were much more than those tested in air at 290 ℃.

关键词： Duplex stainless steel corrosion fatigue crack initiation High temperature water

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Therapeutic uses of animal biles in traditional chinese medicine:An ethnopharmacological,biophysical chemical and medicinal review

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World Journal of Gastroenterology 2014年第29期20卷 9952-9975页

作者： David q-H Wang Martin c carey Gastroenterology Division Department of MedicineBrigham and Women’s HospitalHarvard Medical School and Harvard Digestive Diseases Center Liver center and Gastroenterology Division Department of MedicineBeth Israel Deaconess Medical CenterHarvard Medical School and Harvard Digestive Diseases Center Division of Gastroenterology and Hepatology Department of Internal MedicineEdward Doisy Research CenterSaint Louis University School of Medicine

Forty-four different animal biles obtained from both invertebrates and vertebrates (including human bile) have been used for centuries for a host of maladies in traditional chinese medicine (TcM) beginning with dog, ox and common carp biles approximately in the Zhou dynasty (c. 1046-256 BcE). overall, different animal biles were prescribed principally for the treatment of liver, biliary, skin (including burns), gynecological and heart diseases, as well as diseases of the eyes, ears, nose, mouth and throat. We present an informed opinion of the clinical efficacy of the medicinal uses of the different animal biles based on their presently known principal chemical components which are mostly steroidal detergent-like molecules and the membrane lipids such as unesterified cholesterol and mixed phosphatidylcholines and sometimes sphingomyelin, as well as containing lipopigments derived from heme principally bilirubin glucuronides. All of the available information on the ethnopharmacological uses of biles in TcM were collated from the rich collection of ancient chinese books on materia medica held in libraries in china and United States and the composition of various animal biles was based on rigorous separatory and advanced chemical identification techniques published since the mid-20th century collected via library (Harvard’s countway Library) and electronic searches (PubMed and Google Scholar). our analysis of ethnomedical data and information on biliary chemistry shows that specific bile salts, as well as the common bile pigment bilirubin and its glucuronides plus the minor components of bile such as vitamins A, D, E, K, as well as melatonin (N-acetyl-5-methoxytryptamine) are salutary in improving liver function, dissolving gallstones, inhibiting bacterial and viral multiplication, promoting cardiac chronotropsim, as well as exhibiting anti-inflammatory, anti-pyretic, anti-oxidant, sedative, anti-convulsive, anti-allergic, anti-congestive, anti-diabe

关键词： Bile acids Bile pigments Bilirubinates Liquid crystals Materia medica Mixed micelles Bear bile ox gallstones Paleo-pharmacology Phospholipids

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