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Reduction effect of final-pass heavy reduction rolling on the texture development,tensile property and stretch formability of ZWK100 alloy plates

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Journal of Materials Science & Technology 2022年第16期111卷 211-223页

作者： B.q.Shi L.Y.Zhao X.L.Shang B.H.Nie D.c.chen c.q.li Y.q.cheng School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000China School of Materials and Energy Guangdong University of TechnologyGuangzhouGuangdong 510006China GD Midea Air-conditioning Equipment co. Ltd.Foshan 528311China Guangdong Key Laboratory of Hydrogen Energy Technology Foshan 528000China YunFu(Foshan)R&D center of Hydrogen Energy Standardization Yunfu 527326China

Obviously planar anisotropy due to‘TD split’orthotropic texture(TD indicates Transverse direction)always exist in the Rare-earth(RE)or ca containing Mg alloy sheets,which is likely caused by the lowreduction rolling(and annealing)as revealed in our previous *** this work,the as-cast billets of a ZWK100 alloy were subjected to final-pass heavy reduction rolling(FHRR)at 500°c with different reductions(30%-70%)after rough rolling,aiming to investigate the reduction effect on the microstructure and texture *** results show that FHRR with higher reductions above 50%is in favor of shear banding formation but has little effect on the as-deformed texture components,and the excellent formability with single-pass reduction up to 70%is mainly ascribed to the activation of prismatic *** with reduction above 50%and annealing can generate uniform grain structures of~10μm and symmetrical‘oblique-line split’texture in(0001)pole figures,with basal poles tilting by about 50°from ND(Normal direction)towards some oblique-line of TD and RD(Rolling direction)as well as uniform distribution of counter lines as an annular shape,resulting in excellent elongation to failure of~50%and ultra-low planar anisotropyΔr_of~0.1 and high stretch formability(Erichsen value:8.1).The formation‘oblique-line split’texture in(0001)pole figures is mainly correlated with the preferred growth tendency of grains with■//RD,which was suggested to relate to the high mobility of some special boundaries such as 40°-45°■.The influences of starting textures on the mechanical properties,planar anisotropy and related deformation modes,as well as their correlations with the stretch formability were comparatively investigated with the‘TD split’orthotropic texture as a counterpoint.

关键词： Magnesium alloys Texture Plane anisotropy Stretch formability Rolled sheets

Effect of Icosahedral Phase on crystallographic Texture and Mechanical Anisotropy of Mg–4%li Based Alloys

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Journal of Materials Science & Technology 2017年第5期33卷 475-480页

作者： c.q.li D.K.Xu S.Yu L.Y.Sheng E.H.Han School of Materials Science and Engineering Northeastern University cAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering Shenyang Aerospace University Shenzhen Institute Peking University Shenzhen Key Lab Human Tissue Regenerate & Repair

Through investigating and comparing the microstructure and mechanical properties of the as-extruded Mg alloys Mg-4%li and Mg-4%li-6%Zn-l.2%Y （in wt%）, it demonstrates that although the formation of I-phase （Mg3Zn6Y, icosahedral structure） could weaken the crystallographic texture and improve the me- chanical strength, the mechanical anisotropy in terms of strength remains in Mg-4%li-6%Zn-1.2%Y alloy. Failure analysis indicates that for the Mg-4%li alloy, the fracture surfaces of the tensile samples tested along transverse direction （TD） contain a large number of plastic dimples, whereas the fracture surface exhibits quasi-cleavage characteristic when tensile samples were tested along extrusion direction （ED）. For the Mg-4%li-6%Zn-I.2%Y alloy, typical ductile fracture surfaces can be observed in both ＂TD＂ and ＂ED＂ samples. Moreover, due to the zonal distribution of broken l-phase particles, the fracture surface of ＂TD＂ samples is characterized by the typical ＂woody fracture＂.

关键词： Mg-li alloy Texture Mechanical anisotropy Fracture

Suppressing Effect of Heat Treatment on the Portevin–Le chatelier Phenomenon of Mg–4%li–6%Zn–1.2%Y Alloy

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Journal of Materials Science & Technology 2016年第12期32卷 1232-1238页

作者： c.q.li D.K.Xu B.J.Wang L.Y.Sheng E.H.Han School of Materials Science and Engineering Northeastern University Shenyang 110819 China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Environmental corrosion center Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Shenzhen Institute Shenzhen Key Lab Human Tissue Regenerate and Repair Peking University Shenzhen 518057 China

Microstructural evolution and Portevin-Le chatelier（PLc） phenomenon of the as-extruded Mg-4%li-6%Zn-1.2%Y alloy before and after heat treatment have been *** has been demonstrated that for the as-extruded and solid solution treated（T4） samples,the PLc phenomenon could be obviously observed on tensile stress-strain ***,the PLc phenomenon in T4 samples was more salient than that in the as-extruded condition,suggesting that the occurrence of PLc phenomenon was closely related to the super-saturation degree of solute atoms in the *** most of solute atoms were consumed for the formation of Mg Zn precipitates（β1′ and a little of β2′） during the subsequent ageing treatment（T6）,the PLc phenomenon of T6 samples was ***,due to the pinning effect of the formed Mg Zn precipitates on mobile dislocations,the tensile strength of T6 samples was relatively higher than those of the other two conditions.

关键词： Mg-li alloy Heat treatment Portevin-Le chatelier (PLc) effect Precipitates

Effect of temperature on the mechanical abnormity of the quasicrystal reinforced Mg-4%li-6%Zn-1.2%Y alloy

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Journal of Magnesium and Alloys 2015年第2期3卷 106-111页

作者： c.q.li D.K.Xu T.T.Zu E.H.Han L.Wang Environmental corrosion center Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials and Metallurgy Northeastern UniversityShenyang 110819China

The serrated phenomena of the quasicrystalline phase reinforced Mg-4%li-6%Zn-1.2%Y alloy after the extrusion,solid solution treatment and aged treatment have been investigated at different *** result shows that when the temperature is above 100℃,the serrated phenomenon becomes weak and all the serrated amplitudes are lower than 1 *** them,the serrated amplitude of samples in aged condition is the lowest and the value is only 0.1-0.2 *** underneath mechanism for the lower plastic instability at higher temperature(≥100℃)can be ascribed to the weak pining effect of solute atoms on the movement of dislocation and release of the pile-up dislocations.

关键词： Mg-li PLc quasicrystal High temperature deformation Mechanical property

Historic Great Breakthrough on the cultivation of the Ganoderma lucidum Spore Powder

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Historic Great Breakthrough on the Cultivation of the Ganode...

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

第五届国际药用菌大会

作者： c.q.li~*,D.F.TONG & c.li Zhejiang Longquan Xinglong Biological Technology co.,Ltd,china Zhejiang Longquan Xinglong Science and Technology Development Institute,china.

Ganoderma lucidum has a long history in china,but the wild *** spore powder cannot be *** collection and application of spore powder follows the development of the artificial cultivation of the *** has only 30 years till *** spore powder used to be very precious due to difficulty of collection."New Technology Search"(2003) shows that,at that time with peak output,only 3.6 kg spore powder can be collected per 100 kg *** unit output is only 3.6%.Then with our patent technologies,100 kg cultivated spore power can be collected from 100 kg *** of large area unit production in *** unit output of the spore powder is 100%.Thus historic great breakthrough on the cultivation of the *** spore powder is realized with 27 times *** has field tested of six pieces of *** in 2006,the spore powder is 952 grams,the fruiting body is 710 grams,the unit output of spore powder is 134%.Field tested of three pieces of *** in 2007,the spore powder is 325 grams,the fruiting body is 226 grams the unit output of spores powder is 143.8%.The spore power cultivated with our patent technologies has high-purity with polysaccharides,triterpenes and such active *** oil yield ratio under cO supercritical extraction is higher than the similar products. Successful cultivation of the high yield and high quality spore powder brings great and deep influence on the development of national *** spore *** of all,it completely solved the problem of spore *** the patented technology has been promoted and applied in more than 30 provinces and cities with annual output over 800 *** can offer large quantity and high quality resource of spore powder pharmaceuticals and health products manufacturing *** guarantees the products’ quality from the ***,it has greatly reduced spore cultivation costs,increase profit margins of the processed products,bring great economic force fo

关键词： G.lucidum spore powder output/quality cultivation/collection

来源： cnki会议评论

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cnki会议

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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

correlation between the rock mass properties and maximum horizontal stress:A case study of overcoring stress measurements

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 39-48页

作者： Peng li Meifeng cai Shengjun Miao Yuan li Yu Wang Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China State Key Laboratory of coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China

Understanding the mechanical properties of the lithologies is crucial to accurately determine the horizontal stress *** investigate the correlation between the rock mass properties and maximum horizontal stress,the three-dimensional(3D)stress tensors at 89 measuring points determined using an improved overcoring technique in nine mines in china were adopted,a newly defined characteristic parameter c_(ERP)was proposed as an indicator for evaluating the structural properties of rock masses,and a fuzzy relation matrix was established using the information distribution *** results indicate that both the vertical stress and horizontal stress exhibit a good linear growth relationship with *** is no remarkable correlation between the elastic modulus,Poisson's ratio and depth,and the distribution of data points is scattered and ***,there is no obvious relationship between the rock quality designation(RqD)and *** maximum horizontal stress σ_(H) is a function of rock properties,showing a certain linear relationship with the c_(ERP)at the same *** addition,the overall change trend of σ_(H) determined by the established fuzzy identification method is to increase with the increase of c_(ERP).The fuzzy identification method also demonstrates a relatively detailed local relationship betweenσ_H and c_(ERP),and the predicted curve rises in a fluctuating way,which is in accord well with the measured stress data.

关键词： overcoring stress measurements elastic modulus Poisson's ratio rock quality designation maximum horizontal stress fuzzy identification

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

Axisymmetric wetting of a liquid droplet on a stretched elastic membrane

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Applied Mathematics and Mechanics(English Edition) 2023年第6期44卷 997-1006页

作者： c.q.RU Department of Mechanical Engineering University of AlbertaEdmontonAB T6G 2G8Canada

Wetting of a liquid droplet on another liquid substrate is governed by the well-known Neumann *** present work aims to develop an explicit modified version of the Neumann equations for axisymmetric wetting of a liquid droplet on a highly stretched elastic membrane of non-zero bending *** explicit modified form of the Neumann equations is derived to determine the two contact angles,which is reduced to Young's equation for a liquid droplet on a rigid membrane or to the Neumann equations for a liquid droplet on another liquid *** implications of the modified Neumann equations are examined by comparison with some previous results reported in the recent literature,particularly considering the ranges of material and geometrical parameters of the liquid droplet-membrane system which have not been recently addressed in the literature.

关键词： Neumann equation Young's equation liquid droplet membrane pretension