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In-situ study of the microstructure evolution during tension of a Mg-Y-Zn-Al alloy processed by rapidly solidified ribbon consolidation technique

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Journal of Magnesium and Alloys 2024年第5期12卷 2024-2040页

作者： Jeno Gubicza Kristián Máthis Péter Nagy Péter Jenei Zoltán Hegedus Andrea Farkas Jozef Vesely Shin-ichi Inoue Daria Drozdenko Yoshihito Kawamura Department of Materials Physics Faculty of ScienceEotvos Loránd UniversityPázmány P.sétány 1/ABudapest H-1117Hungary Department of Physics of Materials Faculty of Mathematics and PhysicsCharles UniversityKe Karlovu 512116 Praha 2Czech Republic Deutsches Elektronen-Synchrotron DESY Notkestr.85Hamburg 22603Germany Magnesium Research Center Kumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan

Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance indicating promising application *** material has a bimodal microstructure consisting of fine recrystallized and coarse non-recrystallized grains with solute-rich stacking faults forming cluster arranged layers(CALs)and nanoplates(CANaPs),or complete long period stacking ordered(LPSO)*** order to reveal the deformation mechanisms,in-situ synchrotron X-ray diffraction line profile analysis was employed for a detailed study of the dislocation arrangement created during tension in Mg-0.9%Zn-2.05%Y-0.15%Al(at%)*** uncovering the effect of the initial microstructure on the mechanical performance,additional samples were obtained by annealing of the as-consolidated specimen at 300 and 400℃ for 2 *** heat treatment at 300℃ had no significant effect on the initial microstructure,its evolution during tension and,thus,the overall deformation behavior under tensile *** the other hand,annealing at 400℃ resulted in a significant increase of the recrystallized grains fraction and a decrease of the dislocation density,leading to only minor degradation of the mechanical *** maximum dislocation density at the failure of the samples corresponding to the plastic strain of 10-25% was estimated to be about 16-20×10^(14)m^(-2).The diffraction profile analysis indicated that most dislocations formed during tension were of non-basal and pyramidal types,what was also in agreement with the Schmid factor values revealed independently from orientation *** was also shown that the dislocation-induced Taylor hardening was much lower below the plastic strain of 3% than above this value,which was explained by a model of the interaction between prismatic dislocations and CANaPs/LPSO plates.

关键词： Mg-Zn-Y-Al alloy Long period stacking ordered(LPSO)phase Cluster arranged nanoplates(CANaPs) Annealing tension Dislocation density Hardening

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Life under tension: the relevance of force on biological polymers

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Biophysics Reports 2024年第1期10卷 48-56页

作者： Matthew T.J.Halma Longfu Xu Department of Physics and Astronomy and Laser Lab Vrije Universiteit Amsterdam LUMICKS B.V.

Optical tweezers have elucidated numerous biological processes, particularly by enabling the precise manipulation and measurement of tension. One question concerns the biological relevance of these experiments and the generalizability of these experiments to wider biological systems. Here, we categorize the applicability of the information garnered from optical tweezers in two distinct categories: the direct relevance of tension in biological systems, and what experiments under tension can tell us about biological systems, while these systems do not reach the same tension as the experiment, still, these artificial experimental systems reveal insights into the operations of biological machines and life processes.

关键词： tension Optical tweezers Molecular force

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Crealet presents its innovative warp tension solutions at Techtextil 2024

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China Textile 2024年第2期 43-43页

Crealet is the world leader in sophisticated warp feeding technology and tailored *** warp tension stands also for controlled fabric *** Swiss firm presents its latest developments for technical textile applications a... 详细信息

关键词： tension warp Germany

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Fatigue crack propagation in fine-grained magnesium under low temperature tension-tension cyclic loading

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Journal of Magnesium and Alloys 2023年第12期11卷 4420-4430页

作者： Qizhen Li School of Mechanical and Materials Engineering Washington State UniversityPullmanWAUSA

Fine-grained magnesium was tested under stress-controlled tension-tension cyclic loading at -30 ℃ and the tested sample was observed using scanning electron microscope and electron backscatter diffraction to explore the fatigue behavior and crack propagation. The fatigue data showed that the material experienced cyclic softening followed by cyclic hardening before the final fracture failure. The microscopic observations demonstrated that the cracks were almost perpendicular to the loading direction with some zigzags and the cracks progressed along both small angle grain boundaries and large angle grain boundaries. Although the cracks were mainly propagated along large angle grain boundaries, the value of grain boundary angle was not the primary factor to determine the crack propagation direction. The local residual strain from the rolling process was released due to the crack propagation and there was more strain relaxation at regions closer to the cracks.

关键词： Fine-grained magnesium Fatigue properties tension Crack propagation Low temperatures

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How to manage isolated tension non-surgical pneumoperitonium during bronchoscopy?A case report

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World Journal of Clinical Cases 2022年第34期10卷 12717-12725页

作者： Yang-Jin Baima Dan-Dan Shi Xing-Ya Shi Li Yang Yun-Tao Zhang Ba-Sang Xiao He-Yan Wang Hang-Yong He Department of Pulmonary Medicine Lhasa People’s HospitalLhasa 850013Tibet Autonomous RegionChina Department of Critical Care Medicine The Sixth Hospital of GuiyangSchool of Basic MedicineGuizhou University of Traditional Chinese MedicineGuiyang 550002Guizhou ProvinceChina Department of Respiratory and Critical Care Medicine Beijing Institute of Respiratory MedicineBeijing Key Laboratory of Respiratory and Pulmonary CirculationBeijing Chao-Yang HospitalCapital Medical UniversityBeijing 100020China

BACKGROUND tension pneumoperitonium is a rare complication during bronchoscopy that can cause acute respiratory and hemodynamic failure,with fatal *** pneumoperitonium during bronchoscopy usually results from ruptures of the abdominal viscera that need surgical ***-surgical pneumoperitoneum(NSP)refers to some pneumoperitoneum that could be relieved without surgery and only by conservative ***,the clinical experience of managing tension pneumoperitonium during bronchoscopy is limited and *** SUMMARY A 51-year-old female was admitted to our hospital for cough with bloody sputum of seven *** the 8th day of her admission,a bronchoscopy was arranged for bronchial-alveolar lavage to detect possible pathogens in the lower respiratory tract,as oxygen was delivered via a 12 F nasopharyngeal cannula,approximately 5-6 cm from the tip of the catheter,with a flow rate of 5-10 L/*** four minutes of bronchoscopy,the patient suddenly vomited 20 mL of water,followed by severe abdominal pain,while physical examination revealed obvious abdominal distension,as well as hardness and tenderness of the whole abdomen,which was considered pneumoperitonium,and the bronchoscopy was terminated immediately.A computer tomography scan indicated isolated tension pneumoperitonium,and abdominal decompression was performed with a drainage tube,after which her symptoms were relieved.A multidisciplinary expert consultation discussed her situation and a laparotomy was suggested,but finally refused by her *** had no signs of peritonitis and was finally discharged 5 d after bronchoscopy with a good *** The possibility of tension pneumoperitonium during bronchoscopy should be guarded against,and given its serious clinical consequences,cardiopulmonary instability should be treated *** strategies could be adopted according to whether it is complicated with pneumothorax or pneumomediastinum,and the presence of p

关键词： Pneumoperitonium tension Isolated Non-surgical Bronchoscopy Case report

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tension and Thickness Control Strategy Analysis of Two Stands Reversible Cold Rolling Mill

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Journal of Iron and Steel Research(International) 2012年第10期19卷 20-25页

作者： LIU Guang-ming1, DI Hong-shuang2, ZHOU Cun-long1, LI Hong-cui3, LIU Jiang3 (1. College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China 2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China 3. Cold Rolling Plant, Jinan Iron and Steel Group Co Ltd, Jinan 250101, Shandong, China) College of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan Shanxi China State Key Laboratory of Rolling and Automation Northeastern University Shenyang Liaoning China Cold Rolling Plant Jinan Iron and Steel Group Co Ltd Jinan Shandong China

In order to lucubrate the rolling characteristic of the two stands reversible cold rolling mill and establish the tension and thickness control strategy, the steady-state characteristic simulating program was established using the steady-state continuous rolling theory. The influences of each factor on exit thickness under different tension control methods were analyzed. The results show that, the influence of the entry stand gap on exit thickness is significant and it changes little with different tension control methods. As a result, the entry stand gap can be used as the main control method of exit thickness, whereas rolling speed of any stand and roll gap of the exit stand can be used to adjust the inter-stand tension. The results are beneficial for thickness and tension control of the two stands reversible cold rolling mill.

关键词： two stand reversible cold rolling thickness tension control strategy

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Modeling bubble column reactor with the volume of fluid approach:Comparison of surface tension models

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2659-2665页

作者： Qi Liu Zhenghong Luo Department of Chemical Engineering College of Chemistry and Chemical EngineeringState Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China

This work aims at comparing surface tension models in VOF(Volume of Fluid) modeling and investigating the effects of gas distributor and gas velocity. Hydrodynamics of a continuous chain of bubbles inside a bubble column reactor was simulated. The grid independence study was first conducted and a grid size of 1.0 mm was adopted in order to minimize the computing time without compromising the accuracy of the results. The predictions were validated by comparing the experimental studies reported in the literature. It was found that all surface tension models can describe the bubble rise and bubble plume in a column with slight deviations.

关键词： Bubble column reactor Computational fluid dynamics Volume of fluid method Surface tension models Gas distributor

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COALESCENCE BETWEEN SMALL BUBBLES:EFFECTS OF SURFACE tension GRADIENT

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Chinese Journal of Chemical Engineering 1996年第4期4卷 11-22页

作者：李佟茗天津大学化学工程系天津

1 INTRODUCTIONThe rate of coalescence between bubbles is important to the stability of foams,the mo-bility control in tertiary oil recovery,and a broad class of operations in which gas orvapor is the dispersed ***,it is very important that the mechanism of thecoalescence process be understood,so that the effects of the physical properties oncoalescence can be assessed.

关键词： bubble coalescence thin film drainage surface mobility surface tension gradient

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CALCULATION MODEL OF SURFACE tension FOR ALLOY MELTS

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中国有色金属学会会刊：英文版 1998年第3期8卷 155-160页

作者： Cheng, Guoguang Liao, Nengbin Univ of Science and Technology Beijing Beijing China

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓｏｆｇｒｅａｔｉｍｐｏｒｔａｎｃｅｆｏｒｔｈｅｅｓｔｉｍａｔｉｏｎｏｆｓｕｒｆａｃｅｔｅｎｓｉｏｎｆｏｒａｌｏｙｍｅｌｔ．Ｍａｎｙｍｅｔａｌｕｒｇｙｐｈｅｎｏｍｅｎａ，ｓｕｃｈａｓ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓｏｆｇｒｅａｔｉｍｐｏｒｔａｎｃｅｆｏｒｔｈｅｅｓｔｉｍａｔｉｏｎｏｆｓｕｒｆａｃｅｔｅｎｓｉｏｎｆｏｒａｌｏｙｍｅｌｔ．Ｍａｎｙｍｅｔａｌｕｒｇｙｐｈｅｎｏｍｅｎａ，ｓｕｃｈａｓＣＯｂｕｂｂｌｅｓｇｅｎｅｒａｔｉ...

关键词： alloy melt surface tension activity mass action concentration

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A Statistical Thermodynamic Model of Vapor-Liquid Interfacial tension for Liquid Mixtures at High Pressure

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Chinese Journal of Chemical Engineering 1998年第3期6卷 73-79页

作者：李志宝陆九芳李以圭清华大学化工系北京

1 INTRODUCTIONInterfacial tension of pure fluids and their mixtures is an important property for the development,design and simulation of many chemical *** interfacial behavior has important prac-tical applications in material science,environment science and chemical engineering separationprocesses as well as in secondary or tertiary recovery of *** interfacial phenom-ena are rather complicated,interfacial tension of free vapor-liquid interface is considered as a firstand fundamental step of the *** example,enhanced carbon dioxide“flooding”

关键词： interfacial tension liquid mixture critical points

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