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Effect of pre-twinning and heat treatment on formability of AZX311 Mg alloy

Journal of Magnesium and Alloys 2024年第3期12卷 1154-1169页

作者： Mahesh Panchal Lalit Kaushik Min-Seong Kim Ravi Kottan Renganayagalu shi-Hoon Choi Jaiveer singh Department of Mechanical Engineering Indian Institute of Technology JodhpurKarwarJodhpur 342030RajasthanIndia Department of Metallurgical and Materials Engineering Indian Institute of Technology JodhpurKarwarJodhpur 342030RajasthanIndia Energy Materials Research Center Korea Institute of Science and Technology(KIST)5 Hwarang-roSeongbuk-guSeoul 02792Republic of Korea Department of Advanced Components and Materials Engineering Sunchon National University255 Jungang-roSuncheonJeonnam 57922Republic of Korea

In this study,the effects of pre-strain-induced tensile twins(TTWs)and controlled heat treatment on the formability behavior of AZX311 Mg alloy sheets were investigated.A 4%compressive strain was applied to pre-strain the sheets using the in-plane compression(IPC)technique along the rolling direction(RD)to introduce *** pre-strained(PS)samples were subsequently heat-treated at 250℃,350℃,and 400℃ independently for 1 hr,and are termed as PSA1,PSA2,and PSA3,*** cupping tests were conducted to assess the formability of the sheet samples under different initial *** results showed that the PS sample heat-treated at 250℃ for 1hr exhibited a decrease in the Erichsen index(IE)compared to the as-rolled sample,whereas PSA2 and PSA3 samples showed an increase in IE *** analysis revealed that most of the TTWs generated through pre-twinning were stable at 250℃;however,the twin volume fraction reduced to 41%at 350℃ compared to the PS samples due to enhanced thermal activity at that ***,PSA2 samples showed severe grain coarsening in some areas of the sample,and the fraction of such grains increased in the PSA3 *** stretch formability(IE value)of PSA2 samples showed a 32.3%increase compared to the as-rolled ***,the analysis of the deformed specimen at failure under the Erichsen test indicated that considerable detwinning occurs in the PS and PSA1 samples,whereas dislocation slip activity dominates in the PSA2 and PSA3 samples during stretch *** from detwinning and dislocation slip,deformation twins were also observed in all samples after the Erichsen ***,this work highlights the importance of texture control and its underlying mechanisms via pre-twinning followed by heat treatment and their impact on the room temperature(RT)stretch formability of AZX311 Mg alloy sheets.

关键词： Mg alloys Pre-twinning Texture Formability EBSD.

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Recent advances in the in-plane shear testing of Mg alloy sheets

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Journal of Magnesium and Alloys 2023年第2期11卷 405-424页

作者： Mahesh Panchal Lalit Kaushik Ravi K.R Rajesh Khatirkar shi-Hoon Choi Jaiveer singh Department of Mechanical Engineering Indian Institute of Technology JodhpurKarwarJodhpur 342030RajasthanIndia Department of Advanced Components and Materials Engineering Sunchon National University255 Jungang-roSuncheonJeonnam 57922Republic of Korea Department of Metallurgical and Materials Engineering Indian Institute of Technology JodhpurKarwarJodhpur 342030RajasthanIndia Department of Metallurgical and Materials Engineering Visvesvaraya National Institute of Technology(VNIT)South Ambazari RoadNagpur 440010MaharashtraIndia

Sheet-metal products are integral parts of engineering industries and academia research. Various testing techniques have revealed the deformation behaviors of sheet metals under complex stress states. Information obtained from tensile and compression tests, however, are insufficient for the identification of material parameters relevant to modern constitutive laws, which require experimental setups capable of generating various loading conditions and applying great amounts of strain to sheet metals. In-plane shear testing has emerged as an important method to overcome the challenges associated with tension and compression tests and can provide additional information about deformation behaviors under large plastic strains. Materials such as Mg alloys with poor levels of both ductility and formability cannot accommodate large plastic strains. Therefore, tension and compression tests have limitations in explaining the material behaviors that occur during sheet metal forming where large plastic strains are introduced. Many studies have been conducted to explain the deformation behaviors of Mg alloys under shear deformation techniques. These include severe plastic deformation(SPD), especially the equal channel angular pressing(ECAP)and equal channel angular extrusion, rolling combined with shear deformation i.e. differential speed rolling(DSR), and also in-plane shear for sheet metals, particularly under large levels of plastic strain. These in-plane shear technique involves the Miyauchi shear test, ASTM shear test, and twin bridge shear tests. Moreover, many experimental results have revealed that the evolution of microstructure and texture during in-plane shear is closely related to the failure behavior of materials. Therefore, this review is focused on techniques for in-plane shear testing that have been reported thus far, on the effect of in-plane shear on the microstructure development of Mg alloy sheets, and on the usefulness of in-plane shear testing to evaluate t

关键词： Mg alloys In-plane shear Texture Formability EBSD

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Nonstationarities and At-site Probabilistic Forecasts of Seasonal Precipitation in the East River Basin, China

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International Journal of Disaster Risk Science 2018年第1期9卷 100-115页

作者： Peng Sun Qiang Zhang Xihui Gu Peijun shi Vijay P.singh Changqing Song Xiuyu Zhang College of Territorial Resources and Tourism Anhui Normal University Key Laboratory of Environmental Change and Natural Disaster Ministry of Education Beijing Normal University State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Academy of Disaster Reduction and Emergency Management Beijing Normal University School of Environmental Studies China University of Geosciences Department of Biological and Agricultural Engineering and Zachry Department of Civil Engineering Texas A&M University South China Institute of Environmental Sciences

Seasonal precipitation changes under the influence of large-scale climate oscillations in the East River basin were studied using daily precipitation data at 29 rain stations during 1959–2010. Seasonal and global models were developed and evaluated for probabilistic precipitation forecasting. Generalized additive model for location,scale, and shape was used for at-site precipitation forecasting. The results indicate that:(1) winter and spring precipitation processes at most stations are nonstationary,while summer and autumn precipitation processes at few of the stations are stationary. In this sense, nonstationary precipitation processes are dominant across the studyregion;(2) the magnitude of precipitation is influenced mainly by the Arctic Oscillation, the North Pacific Oscillation, and the Pacific Decadal Oscillation(PDO). The El Nin? o/Southern Oscillation(ENSO) also has a considerable effect on the variability of precipitation regimes across the East River basin;(3) taking the seasonal precipitation changes of the entire study period as a whole, the climate oscillations influence precipitation magnitude, and this is particularly clear for the PDO and the ENSO. The latter also impacts the dispersion of precipitation changes; and(4) the seasonal model is appropriate for modeling spring precipitation, but the global model performs better for summer, autumn, and winter precipitation.

关键词： China ENSO regimes GAMLSS model Nonstationarity Probabilistic precipitation forecasting

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Ion emission from warm dense matter produced by irradiation with a soft x-ray free-electron laser

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Matter and Radiation at Extremes 2024年第1期9卷 71-84页

作者： Josef Krása Tomás Burian Vera Hájková Jaromír Chalupský Šimon Jelínek Katerina Frantálová Michal Krupka Zuzana Kuglerová Sushil Kumar singh Vojtech Vozda Ludek Vysín MichalŠmíd Pablo Perez-Martin Marion Kühlman Juan Pintor Jakub Cikhardt Matthias Dreimann Dennis Eckermann Felix Rosenthal Sam M.Vinko Alessandro Forte Thomas Gawne Thomas Campbell Shenyuan Ren YuanFeng shi Trevor Hutchinson Oliver Humphries Thomas Preston Mikako Makita Motoaki Nakatsutsumi Xiayun Pan Alexander Köhler Marion Harmand Sven Toleikis Katerina Falk Libor Juha Department of Radiation and Chemical Physics Institute of PhysicsCzech Academy of SciencesNa Slovance 218221 Prague 8Czech Republic Laser Plasma Department Institute of Plasma PhysicsCzech Academy of SciencesZa Slovankou 318200 Prague 8Czech Republic Department of Surface and Plasma Science Faculty of Mathematics and PhysicsCharles University in PragueV Holesovi ckách 218000 Prague 8Czech Republic Department of Physical Electronics Faculty of Nuclear Science and Engineering PhysicsCzech Technical University in PragueV Holesovi ckách 218000 Prague 8Czech Republic Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstraße 40001328 DresdenGermany DESY Photon Science Notkestraße 85D-22607 HamburgGermany Institut de Minéralogie de Physique des Matériaux et de CosmochimieUMR 7590–UPMC/CNRS/IRD/MNHNSorbonne Université4 place Jussieu75005 ParisFrance Department of Physics Faculty of Electrical EngineeringCzech Technical University in PragueTechnická216627 Prague 6Czech Republic Center for Soft Nanoscience University of MünsterBusso-Peus-Straße 10D-48149 MünsterGermany Department of Physics Clarendon LaboratoryUniversity of OxfordParks RoadOxford OX13PUUnited Kingdom Central Laser Facility STFC Rutherford Appleton LaboratoryDidcot OX110QXUnited Kingdom Lawrence Livermore National Laboratory 7000 East AvenueLivermoreCalifornia 94550USA European XFEL GmbH Holzkoppel 4D-22869 SchenefeldGermany Technische Universität Dresden 01062 DresdenGermany

We report on an experiment performed at the FLASH2 free-electron laser(FEL)aimed at producing warm dense matter via soft x-ray isochoric *** the experiment,we focus on study of the ions emitted during the soft x-ray ablation process using time-of-flight electron multipliers and a shifted Maxwell–Boltzmann velocity distribution *** find that most emitted ions are thermal,but that some impurities chemisorbed on the target surface,such as protons,are accelerated by the electrostatic field created in the plasma by escaped *** morphology of the complex crater structure indicates the presence of several ion groups with varying *** find that the ion sound velocity is controlled by the ion temperature and show how the ion yield depends on the FEL radiation attenuation length in different materials.

关键词： electrostatic emitted chemi

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Additive manufacturing of tungsten,tungsten-based alloys,and tungsten matrix composites

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Tungsten 2023年第1期5卷 1-31页

作者： Shuai-Hang Pan Gong-Cheng Yao Yi-Nan Cui Fan-shi Meng Chuan Luo Tian-Qi Zheng Gurminder singh Department of Mechanical Engineering University of UtahSalt Lake CityUT 84112USA University of California-Los Angeles Los AngelesCA 90095USA Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China University of Grenoble Alpes CNRSGrenoble INPSIMaP38000 GrenobleFrance Department of Civil and Systems Engineering Johns Hopkins University3400 N.Charles StreetBaltimoreMD 21218USA Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Mechanical and Materials Engineering University College DublinDublin 4Ireland Department of Mechanical Engineering Indian Institute of Technology BombayMumbai 400076India

Tungsten(W) materials are gaining more and more attention due to the extended applications of metallic systems in the extreme *** W’s unique characteristics like room-temperature brittleness,additive manufacturing(AM)techniques could give them a higher design flexibility and *** the growing focus and thriving development of W-faced AM techniques,since the mechanical performance of additively manufactured W parts is still unsatisfactory,a critical review to further explore the possibilities of combining W and AM processes is urgently *** this review,we systematically explain the fundamentals of AM processes for W *** the traditional classification,we further discuss the widely used AM processes including wire arc additive manufacturing(WAAM),electron beam melting(EBM),laser powder bed fusion(LPBF),laser direct energy deposition(laser DED),and other modified yet emergent AM ***,since additively manufacturing W materials is processing parameter-sensitive,we illustrated the effects of various important processing parameters on the AM process control and final parts’ *** this detailed understanding,various categories of AM-compatible W materials(i.e.,pure W,W alloys,and W composites) were presented,and their general mechanical performance,distinct role(particularly the role of different alloying elements and added secondary-phase particles in W),and application-oriented benefits have been *** clarifying the current status,main challenges,and triumphant successes for additively manufacturing W materials,we further provide a concise prospect into the development of additively manufactured(AMed) W materials by integrating potential fabrication,measurement,alloy design,and application’s *** summary,this critical review investigates the fundamental and practical problems crucially limiting the applications of AMed W materials,and the comprehensive discussion concentr

关键词： Tungsten Additive manufacturing Alloy design Composite design Cracking Mechanical properties

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Estimation of As and Cu Contamination in Agricultural Soils Around a Mining Area by Reflectance Spectroscopy:A Case Study

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Pedosphere 2009年第6期19卷 719-726页

作者： REN Hong-Yan ZHUANG Da-Fang A. N. singh PAN Jian-Jun QIU Dong-Sheng shi Run-He College of Resource and Environmental Sciences Nanjing Agricultural University Nanjing 210095 (China) Resource and Environmental Science Data Center Chinese Academy of Sciences Beijing 100101 (China) Key Laboratory of Resources Remote Sensing & Digital Agriculture Ministry of Agriculture Beijing 100081 Department of Botany Panjab University Chandigarh-160014 (India) Key Laboratory of Geographic Information Science for Ministry of Education East China Normal University Shanghai 200062 (China)

Concentrations of Iron (Fe), As, and Cu in soil samples from the fields near the Baoshan Mine in Hunan Province, China, were analyzed and soil spectral reflectance was measured with an ASD FieldSpec FR spectroradiometer (Analytical Spectral Devices, Inc., USA) under laboratory condition. Partial least square regression (PLSR) models were constructed for predicting soil metal concentrations. The data pre-processing methods, first and second derivatives (FD and SD), baseline correction (BC), standard normal variate (SNV), multiplicative scatter correction (MSC), and continuum removal (CR), were used for the spectral reflectance data pretreatments. Then, the prediction results were evaluated by relative root mean square error (RRMSE) and coefficients of determination (R 2 ). According to the criteria of minimal RRMSE and maximal R 2 , the PLSR models with the FD pretreatment (RRMSE = 0.24, R 2 = 0.61), SNV pretreatment (RRMSE = 0.08, R 2 = 0.78), and BC-pretreatment (RRMSE = 0.20, R 2 = 0.41) were considered as the final models for predicting As, Fe, and Cu, respectively. Wavebands at around 460, 1 400, 1 900, and 2 200 nm were selected as important spectral variables to construct final models. In conclusion, concentrations of heavy metals in contaminated soils could be indirectly assessed by soil spectra according to the correlation between the spectrally featureless components and Fe; therefore, spectral reflectance would be an alternative tool for monitoring soil heavy metals contamination.

关键词： data pre-processing heavy metal regression models soil iron spectral reflectance

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On the tuning of electrical and thermal transport in thermoelectrics: an integrated theory–experiment perspective

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npj Computational Materials 2016年第1期2卷 216-232页

作者： Jiong Yang Lili Xi Wujie Qiu Lihua Wu Xun shi Lidong Chen Jihui Yang Wenqing Zhang Ctirad Uher David J singh Materials Genome Institute Shanghai UniversityShanghaiChina State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiChina Department of Physics East China Normal UniversityShanghaiChina Material Science and Engineering Department University of WashingtonSeattleWAUSA Department of Physics University of MichiganAnn ArborMIUSA Department of Physics and Astronomy University of MissouriColumbiaMOUSA

During the last two decades,we have witnessed great progress in research on *** are two primary *** is the fundamental understanding of electrical and thermal transport,enabled by the interplay of theory and experiment;the other is the substantial enhancement of the performance of various thermoelectric materials,through synergistic optimisation of those intercorrelated transport *** we review some of the successful strategies for tuning electrical and thermal *** electrical transport,we start from the classical but still very active strategy of tuning band degeneracy(or band convergence),then discuss the engineering of carrier scattering,and finally address the concept of conduction channels and conductive networks that emerge in complex thermoelectric *** thermal transport,we summarise the approaches for studying thermal transport based on phonon–phonon interactions valid for conventional solids,as well as some quantitative efforts for *** also discuss the thermal transport in complex materials with chemical-bond hierarchy,in which a portion of the atoms(or subunits)are weakly bonded to the rest of the structure,leading to an intrinsic manifestation of part-crystalline part-liquid state at elevated *** this review,we provide a summary of achievements made in recent studies of thermoelectric transport properties,and demonstrate how they have led to improvements in thermoelectric performance by the integration of modern theory and experiment,and point out some challenges and possible directions.

关键词： electrical thermal theory

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Polymorphism-Dependent Dynamic Ultralong Organic Phosphorescence

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Research 2020年第1期2020卷 1501-1509页

作者： Mingxing Gu Huifang shi Kun Ling Anqi Lv Kaiwei Huang Manjeet singh He Wang Long Gu Wei Yao Zhongfu An Huili Ma Wei Huang Institute of Flexible Electronics(IFE) Northwestern Polytechnical University(NPU)127 West Youyi RoadXi’an 710072China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)30 South Puzhu RoadNanjing 211816China

Developing ultralong organic phosphorescence(UOP)materials with smart response to external stimuli is of great interest in photonics applications,whereas the manipulation of molecular stacking on tuning such dynamic UOP is still a formidable ***,we have reported two polymorphs with distinct photoactivated dynamic UOP behavior based on a pyridine derivative for the first *** experiment revealed that the dynamic UOP behavior including photoactivation and deactivation feature is highly dependent on irradiation intensity and environmental ***,given the unique dynamic UOP feature,these phosphors have been successfully applied to phosphorescence-dependent molecular logic gate and timing data *** result not only paves a way to design smart functional materials but also expands the scope of the applications on organic phosphorescence materials.

关键词： materials. smart behavior

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不同热处理工艺对Ti6Al4V钛合金微观结构和力学性能影响（英文）

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稀有金属材料与工程 2017年第3期46卷 634-639页

作者：刘婉颖林元华陈宇海施太和 Ambrish singh 四川大学四川成都610065 西南石油大学材料科学与工程学院四川成都610500 西南石油大学油气藏地质及开发工程国家重点实验室四川成都610500 Lovely Faculty of Technology and Sciences Lovely Professional University

通过对Ti6Al4V钛合金进行不同工艺的热处理,分析了不同工艺处理后的显微组织,进行了拉伸试验、示波冲击试验测试。研究固溶时效处理对Ti6Al4V钛合金显微组织、力学性能和冲击韧性的影响。利用金相显微镜、环境扫描电镜(ESEM)进一步分析... 详细信息

通过对Ti6Al4V钛合金进行不同工艺的热处理,分析了不同工艺处理后的显微组织,进行了拉伸试验、示波冲击试验测试。研究固溶时效处理对Ti6Al4V钛合金显微组织、力学性能和冲击韧性的影响。利用金相显微镜、环境扫描电镜(ESEM)进一步分析了钛合金的组织、冲击断口特征与力学性能间的关系。结果表明,随固溶温度升高,钛合金屈服强度和抗拉强度得到显著提高,塑韧性先增加后降低。优化热处理工艺后,Ti6Al4V钛合金经960℃/1 h+WQ和500℃/4 h+AC处理,获得优良综合性能,σ_(0.2)为1050 MPa,σ_b为1120 MPa,A_k为46.22 J·cm^(-2)。钛合金固溶时效后的组织由β基体和析出的α相组成,片层状β相和小针丛状α相组织能提高合金综合性能。

关键词：热处理 Ti6Al4V钛合金微观结构力学性能

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Multiple Elite Individual Guided Piecewise Search-Based Differential Evolution

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IEEE/CAA Journal of Automatica Sinica 2023年第1期10卷 135-158页

作者： Shubham Gupta shitu singh Rong Su Shangce Gao Jagdish Chand Bansal the School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore the Department of Mathematics South Asian UniversityNew Delhi 110021India IEEE Faculty of Engineering University of ToyamaToyama-shi 930-8555Japan

The differential evolution(DE)algorithm relies mainly on mutation strategy and control parameters'*** take full advantage of top elite individuals in terms of fitness and success rates,a new mutation operator is *** control parameters such as scale factor and crossover rate are tuned based on their success rates recorded over past evolutionary *** proposed DE variant,MIDE,performs the evolution in a piecewise manner,i.e.,after every predefined evolutionary stages,MIDE adjusts its settings to enrich its diversity *** performance of the MIDE is validated on two different sets of benchmarks:CEC 2014 and CEC 2017(special sessions&competitions on real-parameter single objective optimization)using different performance *** the end,MIDE is also applied to solve constrained engineering *** efficiency and effectiveness of the MIDE are further confirmed by a set of experiments.

关键词： Control parameters differential Evolution metaheuristic algorithms mutation operator

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