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ELECTROCHEMICAL KINETICS ON BULK CONCENTRATE SEPARATION OF PYRITE AND GALENA

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中国有色金属学会会刊：英文版 1999年第2期9卷 164-169页

作者： Feng, Qiming Chen, Jianhua lu, yiping Chen, Jin Central South Univ of Technology Changsha China

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关键词： galenapyriteelectrochemical floatationelectrochemical reduction kinetics

Amorphous Formation in an Undercooled Binary Ni-Si Alloy under Slow Cooling Rate

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Journal of Materials Science & Technology 2009年第3期25卷 370-372页

作者： yiping lu Gencang Yang Xiong Li Yaohe Zhou State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xilan 710072 China

High undercooling up to 392 K was achieved in eutectic Ni70.2Si29.8 alloy melt by using glass fluxing combined with cyclic superheating. A small quantity of amorphous phase was obtained in bulk eutectic Ni70.2Si29.8 alloy when undercooling exceeds 240 K under slow cooling conditions （about 1 K/s）. The amorphous phase was confirmed by high-resolution transmission electron microscopy and differential scanning calorimetry.

关键词： Eutectic alloy Amorphous phase Rapid solidification

Dislocation me diate d dynamic tension-compression asymmetry of a Ni_(2)CoFeV_(0.5)Mo_(0.2) medium entropy alloy

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Journal of Materials Science & Technology 2023年第28期159卷 204-218页

作者： Ao Meng Xiang Chen Yazhou Guo yiping lu Yonghao Zhao Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

Although tension-compression(T-C)asymmetry in yield strength was rarely documented in coarse-grained face centered cubic(FCC)metals as critical resolved shear stress(CRSS)for dislocation slip differs little between tension and compression,the T-C asymmetry in strength,i.e.,higher strength when loaded in compression than in tension,was reported in some FCC high entropy alloys(HEAs)due to twinning and phase transitions activated at high strain regimes in *** this paper,we demonstrate a reversed and atypical tension-compression asymmetry(tensile strength markedly exceeds compressive strength)in a non-equiatomic FCC Ni_(2)CoFeV_(0.5)Mo_(0.2) medium entropy alloy(MEA)under dynamic loading,wherein dislocation slip governs dynamic deformation without twins or phase *** asymme-try can be primarily interpreted as higher CRSS and more hard slip modes(lower average Schmid factor)activated in grains under dynamic tension than ***,larger strain rate sensitivity in dy-namic tension overwhelmingly contributes to the higher flow stress,thanks to the occurrence of more immobile Lomer-locks,narrower spacing of planar slip bands and higher dislocation *** finding may provide some insights into designing MEAs/HEAs with desired properties under extreme conditions such as blast,impact and crash.

关键词： Medium entropy alloy Dynamic deformation Tension-compression asymmetry Slip trace analysis EBSD and TEM

Experiments and simulations of gas-solid flow in an airlift loop reactor

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Particuology 2011年第2期9卷 130-138页

作者： Chaoyu Yan Chunxi lu yiping Fan Rui Cao Yansheng Liu State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China

The hydrodynamics in a gas-solid airlift loop reactor was investigated systematically using experimental measurements and CFD simulation. In the experiments, the time averaged parameters, such as solid frac- tion and particle velocity, were measured by optical fiber probe. In the simulation, the modified Gidaspow drag model accounting for the interparticles clustering was incorporated into the Eulerian-Eulerian CFD model with particulate-phase kinetic theory. Predicted values of solid fraction and particle velocity were compared with experimental results, validating the drag model and the simulation. The results show that the profiles of particle velocity and solid fraction are uniform in annulus. However, the core-annulus structure appears in other three regions （draft tube region, bottom region and particle diffluence region）, which presents the similar heterogeneous feature of aggregative fluidization usually occurred in nor- mal fiuidized beds. Simulated profiles of particle residence time distribution indicate that the airlift loop reactor should be characterized by near perfect mixing.

关键词： Airlift loop FeactoFHydrodynamicsGas-solid two phases flowCFDDrag force model

Flow Behaviour Analysis and Experimental Investigation for Emitter Micro-channels

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Chinese Journal of Mechanical Engineering 2012年第4期25卷 729-737页

作者： WEI Zhengying CAO Meng LIU Xia TANG yiping lu Bingheng State Key Lab for Manufacturing System Engineering Xi 'an Jiaotong University Xi 'an 710049 China

The existing research of the flow behavior in emitter micro-channels mainly focuses on the single-phase flow *** the recent micro-particle image velocimetry（PIV） experimental research on the flow characteristics in various micro-channels mainly focuses on the single-phase fluid ***,using an original-size emitter prototype to perform the experiments on the two-phase flow characteristics of the labyrinth channels is seldom *** this paper,the practical flow of water,mixed with sand escaped from filtering,in the labyrinth channel,is *** some research work on the clogging mechanism of the labyrinth channel＇s structure is *** fluid dynamics（CFD） analysis has been performed on liquid-solid two-phase flow in labyrinth-channel *** on flow visualization technology-micro-PIV,the flow in labyrinth channel has been photographed and *** path line graph and velocity vector graph are obtained through the post-treatment of experimental *** graphs agree well with CFD analysis results,so CFD analysis can be used in optimal design of labyrinth-channel *** the optimized anti-clogging structures of the rectangular channel and zigzag channel have been designed *** CFD numerical simulation and the micro-PIV experiments analysis on labyrinth-channel emitter,make the ＂black box＂ of the flow behavior in the emitter channel ***,the proposed research promotes an advanced method to evaluate the emitter＇s performance and can be used to conducting the optimal design of the labyrinth-channel emitters.

关键词： drip irrigation emitter labyrinth channel two-phase flow analysis anti-clogging micro-PIV

Microstructure and Mechanical Properties of a CoFeNi_2V_(0.5)Nb_(0.75) Eutectic High Entropy Alloy in As-cast and Heat-treated Conditions

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Journal of Materials Science & Technology 2016年第3期32卷 245-250页

作者： Li Jiang yiping lu Wei Wu Zhiqiang Cao Tingju Li School of Materials Science and Engineering Dalian University of Technology State Key Laboratory of Metastable Materials Science and Technology Yanshan University

The eutectic CoFeNi2V0.5Nb0.75 high entropy alloys （HEAs） were heated at 500, 600, 700, 800 and 1000 ℃, respectively for 6 h and subsequently quenched in the water to investigate their thermal stability and phase transformation at high temperature. The microstructure and mechanical properties of the samples were investigated by scanning electron microscopy, X-ray diffraction, compressive and hardness tests. It was found that the as-cast CoFeNi2V0.5Nb0.75 HEAs showed a eutectic microstructure with alternating fcc solid solution phase and Fe2Nb-type Laves phase. The NbNi4-type intermetallic phase appeared when the heat-treated temperature was higher than 600 ℃. With increasing quenching temperature, the volume fraction of the NbNi4-type intermetallic phase increased while that of the eutectic regions decreased. The sample quenched at 800 ℃ showed the most excellent comprehensive mechanical properties; its fracture strength, yield strength and plastic strain were as high as 2586.76 MPa, 2075.18 MPa and 16.73%, respectively. Moreover, the eutectic CoFeNi2V0.5Nb0.75 HEAs exhibited apparent age hardening, especially quenched at 700 ℃, the hardness reached up to the maximum value of HV 727.52.

关键词： High entropy alloy Microstructure Thermal stability Age hardening

Semisolid-rolling and annealing process of woven carbon fibers reinforced Al-matrix composites

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Journal of Materials Science & Technology 2017年第7期33卷 623-629页

作者： Junjia Zhang Shichao Liu yiping lu Li Jiang Yubo Zhang Tingju Li Key Laboratory of Solidification Control and Digital Preparation Technology （Liaoning Province） School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China

Semisolid-rolling method was successfully developed to prepare the Ni-coated woven carbon fibers reinforced Al-matrix composite. Due to the appropriate matrix flowability and rolling pressure, the Al-matrix could infiltrate into the woven fibers sufficiently and attach to the reinforcements closely forming a smooth interface. The rolling speed of 4 rad/min offered a subtle equilibrium between the heat transfer and the material deformation. The covering matrix should be controlled at semisolid state to provide a better infiltration behavior and a protective effect on the carbon fibers. With the addition of fibers, an improvement for more than 25% was obtained in the bending strength of the materials. Furthermore, the woven carbon fibers could strengthen the composite in multiple directions, rather than only along the fiber longitudinal directions. The annealing process promoted the Ni coating to react with and to diffuse into the matrix, resulted in an obvious increase of the bending strength.

关键词： Metal-matrix composites Woven carbon fiber Semisolid-rolling process Annealing Mechanical property

Effects of Nitrogen Doping on Microstructures and Irradiation Resistance of Ti-Zr-Nb-V-Mo Refractory High-Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 1007-1018页

作者： Huanzhi Zhang Tianxin Li Qianqian Wang Zhenbo Zhu Hefei Huang yiping lu Engineering Research Center of High Entropy Alloy Materials(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Shanghai Institute of Applied Physics Chinese Academy of Sciences(CAS)Shanghai201800China

Interstitial strengthening with nitrogen(N)is one of the effective ways to improve the mechanical properties of HEAs,but the effects of N on the microstructures and mechanical properties of the irradiated HEAs have not been studied ***,the microstructures and mechanical properties of N-free and N-doped Ti_(2)ZrNbV_(0.5)Mo_(0.2)HEAs before and after He irradiation were *** results showed that the solid solution strengthening caused by interstitial N improved the yield strength at room temperature and 1023 K without significantly reducing plasticity.N doping significantly promoted the growth,aggregation and wider spatial distribution of He bubbles by enhancing the mobility of He atoms/He-vacancy complexes,with the average size of He bubbles increasing from 10.4 nm in N-free HEA to 31.0 nm in N-doped *** addition,N-doped HEA showed a much higher irradiation hardness increment and hardening fraction than N-free *** to conventional materials doped with N,the introduction of N into Ti_(2)ZrNbV_(0.5)Mo_(0.2)HEA had adverse effects on its resistance to He bubble growth and irradiation *** results of this study indicated that N doping may not improve the irradiation resistance of HEAs.

关键词： High-entropy alloys Nitrogen doping Mechanical properties Helium bubbles Irradiation resistance

Effect of carbon addition on the microstructure and mechanical properties of CoCrFeNi high entropy alloy

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Science China(Technological Sciences) 2018年第1期61卷 117-123页

作者： HUANG TianDang JIANG Li ZHANG ChangLiang JIANG Hui lu yiping LI TingJu Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University ofTechnologv Dalian 116024 China School of Mechanical Engineering. Dalian University of Technology Dalian 116024 China

The effects of C element on the microstructure and properties of CoCrFeNiC,. high entropy alloys （x denoted the atomic fraction of C element at 0, 0.05, 0.1, 0.2, 0.3, and 0.5） were investigated. The equal molar CoCrFeNi alloy with FCC structure exhibits high ductility but weak strength. With the addition of C element, both the hardness and strength of the CoCrFeNiCx high entropy alloys increase as well as the wear resistance. The solution strengthening and the lbrmation of hard carbide phase are the main thctor for the improved strength, hardness and wear resistance of CoCrFeNiC~ high entropy alloys.

关键词： high entropy alloys carbon mechanical properties wear resistance