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Insights into the microstructural design of high-performance Ti alloys for laser powder bed fusion by tailoring columnar prior-βgrains andα-Ti morphology

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Journal of Materials Science & Technology 2024年第20期187卷 156-168页

作者： S.X.Wang S.F.Li X.M.Gan R.D.K.Misra R.Zheng K.Kondoh Y.F.Yang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Science and Technology on Particle Materials Chinese Academy of SciencesBeijing 100190China Department of Metallurgical Materials and Biomedical EngineeringUniversity of TexasEl Paso TX 79968USA Joining and Welding Research Institution Osaka University11-1 MihogaokaIbarakiOsaka 567-0047Japan

A high-performance Ti-Ni-B alloy with good tensile properties and reduced mechanical anisotropy was developed by promoting the columnar to equiaxed transition(CET)of prior-βgrains and modifyingα-laths to equiaxed *** Ni and B contributed to the refinement of columnar prior-βgrains during the L→βphase transformation by generating constitutional *** with Ni,B had a su-perior capability of generating constitutional undercooling,which not only replaced a significant amount of Ni with a minor addition to reduce the formation of brittle eutectoid,but also reacted with Ti to form TiB to promote heterogeneous nucleation ofα-Ti grains during theβ→αphase *** with the restricted growth ofα-laths induced by the refinement of prior-βgrains,a fully equiaxedα-Ti structure was *** competition between the negative effect of brittle eutectoid and the positive role ofα-lath to equiaxed grain transition on the ductility of as-printed Ti-Ni-B alloys was fundamen-tally governed by the morphology of eutectoid and technically dependent on the Ni-B *** the addition was 1.2Ni-0.06B(wt.%)or less,the positive effect ofα-lath on equiaxed grain transition can effectively mitigate the issue of reduced ductility caused by brittle *** contrast,at 1.8Ni-0.09B or greater,the negative effect of eutectoid *** insights into microstructural design obtained through the aforementioned approach were presented and discussed.

关键词： Laser powder bed fusion Titanium alloys Grain refinement Powder processing Anisotropy

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Dynamic apertures with diffusion-regulatory functionality in soft porous crystals:A key to solving the century puzzle on isotopologues separation

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Nano Research 2023年第2期16卷 3254-3255页

作者： Yanhong Li Jianze Xiao Yangyang Guo Ning Han Fangli Yuan Yunfa Chen Ming-Shui Yao State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringInnovation Academy for Green ManufactureChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesChinese Academy of SciencesBeijing 100049China Key Laboratory of Science and Technology on Particle Materials Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The separation of water isotopologues has been a“century-old”challenge,also known as“the Holy Grail”in separation *** water(D2O)is a stable non-radioactive water isotopologue that plays a critical role in scientific research,military,nuclear energy,and medical *** water was first reported in 1931 when *** discovered D2 and D2O,for which he was awarded the Nobel Prize in Chemistry in *** in 1933,*** et *** 0.5μL of heavy water at a concentration of around 65.7%when electrolyzing 10 liters of *** 1935,the world's first heavy water plant was built in Norway,producing 2 tons of heavy water by electrolysis,but the separation factor was merely 1.05,which was extremely *** 1943,the first heavy water plant employing the distillation method was built in the United states.

关键词： separation porous distillation

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Synthesis ofγ-MnS/nanoporous carbon/reduced graphene oxide composites for high-performance supercapacitor

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Carbon Resources Conversion 2022年第3期5卷 222-230页

作者： Abiola Ganiyat Olatoye Jie Zhang Qianyu Wang Erping Cao Wenli Li Emmanuel Oluwaseyi Fagbohun Yanbin Cui State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

In the present work,nanoporous carbon(NPC)was prepared from a metal-organic framework(zeolite imidazolate framework 8,ZIF-8).Different concentrations of graphene oxide(GO)were used to make NPC/reduced graphene oxide(NPC/rGO-x,x=0.5,1.0,1.5,and 2.0)composites,and thenγ-MnS/NPC/rGO-1 composite was synthesized via a simple hydrothermal *** electrochemical characteristics of porous carbon composites(NPC/rGO-x)andγ-MnS/NPC/rGO-1 electrodes were investigated by galvanostatic charge and discharge,cyclic voltammetry,and electrochemical impedance ***/rGO-1 showed the highest specific capacitance of 207 F/g at 0.5 A/***,theγ-MnS/NPC/rGO-1 electrode demonstrates exceptional electrochemical performance with a high specific capacitance of 300 F/g at 0.5 A/g and impressive cyclic stability of 70%capacitance retention after 10,000 cycles at 1 A/*** a result,this study demonstrates thatγ-MnS/NPC/rGO-1 electrode can be considered a promising candidate for high-performance supercapacitors.

关键词： Metal-organic framework Nanoporous carbon Reduced graphene oxide γ-MnS Supercapacitor

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Rare-earth separation based on the differences of ionic magnetic moment via quasi-liquid strategy

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Frontiers of Chemical Science and engineering 2022年第11期16卷 1584-1594页

作者： Na Wang Fujian Li Bangyu Fan Suojiang Zhang Lu Bai Xiangping Zhang College of Chemical and Engineering Zhengzhou UniversityZhengzhou 450001China CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex SystemsBeijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process Engineering and Innovation Academy for Green ManufactureChinese Academy of SciencesBeijing 100190China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China College of Chemistry Nanchang UniversityNanchang 330031China

The separation of rare earth elements is particularly difficult due to their similar physicochemical *** on the tiny differences of ionic radius,solvent extraction has been developed as the“mass method”in industry with hundreds of stages,extremely intensive chemical consumption and large capital *** differences of the ionic magnetic moment among rare earths are greater than that of ionic ***,a novel method based on the large ionic magnetic moment differences of rare earth elements was proposed to promote the separation *** earths were firstly dissolved in the ionic liquid,then the ordering degree of them was improved with the Z-bond effect,and finally the magnetic moment differences between paramagnetic and diamagnetic rare earths in quasi-liquid system were *** the separation of Er/Y,Ho/Y and Er/Ho as examples,the results showed that Er(Ⅲ)and Ho(Ⅲ)containing ionic liquids had obvious magnetic response,while ionic liquids containing Y(Ⅲ)had no *** separation factors of Er/Y and Ho/Y were achieved at 9.0 and 28.82,*** separation via quasi-liquid system strategy provides a possibility of the novel,green,and efficient method for rare earth separation.

关键词： rare earth element different magnetic moment magnetic separation ionic liquid

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Microinterfacial technology enhancing mass transfer in chemical engineering

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Green Energy & Environment 2021年第4期6卷 453-454页

作者： Suojiang Zhang Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The microbubble and microinterface play key roles in the development and progress of the technology in the field of chemical engineering,which has attracted broad attention from the scientific and industrial ***,Zhang et *** a book about microinterfacial mass transfer intensification technology,where they systematically introduced scientific essence,reaction mechanism,equipment structure,and influence law of multiphase reaction process strengthened by microinterface.I believe this book can promote the technological innovation of microbubble-related processes,and also the development of the green chemical industry!

关键词： microinterface microbubble mass transfer green chemical engineering

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Accurately predicting hypersonic transitional flow on cone via a symmetry approach

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Chinese Journal of Aeronautics 2023年第7期36卷 337-347页

作者： Weitao BI Kexin ZHENG Zhou WEI Zhensu SHE State Key Laboratory for Turbulence and Complex Systems and Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Aerodynamics and Computational Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China

A new algebraic transition model is proposed based on a Structural Ensemble Dynamics(SED)theory of wall turbulence,for accurately predicting the hypersonic flow heat transfer on *** model defines the eddy viscosity in terms of a two-dimensional multi-regime distribution of a Stress Length(SL)function,and hence is named as *** paper presents clear evidence of precise predictions of transition onset location and peak heat flux of a wide range of hypersonic Transitional Boundary Layers(TrBL)around straight cone at zero incidence,to an unprecedented accuracy as validated by over 70 measurements for varying five crucial influential factors(Mach number,temperature ratio,cone half angle,nose Reynolds number and noise level).The results demonstrate the universality of the postulated multi-regime similarity structure,in characterizing not only the spatial non-uniform distribution of the eddy viscosity in hypersonic TrBL on cone,but also the dependence of the transition onset location on the five influential *** latter yields a novel correlation formula for transition center Reynolds number which takes similar functional form as the SL function within the symmetry *** is concluded that the SED-SL model simulates TrBL around cone with uniformly high accuracy,and then points out to an optimistic alternative way to construct hypersonic transition model.

关键词： Cones Heat flux Hypersonic boundary layers Transition flow Turbulence models

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A novel triple periodic minimal surface-like plate lattice and its data-driven optimization method for superior mechanical properties

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Applied Mathematics and Mechanics(English Edition) 2024年第2期45卷 217-238页

作者： Yanda WANG Yanping LIAN Zhidong WANG Chunpeng WANG Daining FANG State Key Laboratory for Turbulence and Complex Systems&Center for Applied Physics and Technology College of EngineeringPeking UniversityBeijing 100871China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China

Lattice structures can be designed to achieve unique mechanical properties and have attracted increasing attention for applications in high-end industrial equipment,along with the advances in additive manufacturing(AM)*** this work,a novel design of plate lattice structures described by a parametric model is proposed to enrich the design space of plate lattice structures with high connectivity suitable for AM *** parametric model takes the basic unit of the triple periodic minimal surface(TPMS)lattice as a skeleton and adopts a set of generation parameters to determine the plate lattice structure with different topologies,which takes the advantages of both plate lattices for superior specific mechanical properties and TPMS lattices for high connectivity,and therefore is referred to as a TPMS-like plate lattice(TLPL).Furthermore,a data-driven shape optimization method is proposed to optimize the TLPL structure for maximum mechanical properties with or without the isotropic *** this method,the genetic algorithm for the optimization is utilized for global search capability,and an artificial neural network(ANN)model for individual fitness estimation is integrated for high efficiency.A set of optimized TLPLs at different relative densities are experimentally validated by the selective laser melting(SLM)fabricated *** is confirmed that the optimized TLPLs could achieve elastic isotropy and have superior stiffness over other isotropic lattice structures.

关键词： lattice structure triple periodic minimal surface(TPMS) plate lattice structural optimization machine learning

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CFD simulation for reduction of pyrolusite in fluidized beds

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Particuology 2023年第8期79卷 109-120页

作者： Jingyi Zhu Qi Liu Zheng Zou Qingshan Zhu Hongzhong Li Haoran Li State Key Laboratory of Multi-phase Complex Systems Institute of Processing EngineeringChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of Biochemical Engineering Institute of Processing EngineeringChinese Academy of SciencesBeijing100190China

In this study,a CFD model coupled with heterogeneous flow structure,mass transfer equations,and chemical reaction kinetics is established to forecast the pyrolusite reduction reaction *** with the previous studies which ignore the volume change of solids phase,the influence of volume shrinkage on reaction and flow behavior is explored in this *** shrinkage of pyrolusite is proved to be non-negligible in predicting the conversion *** negligence of volume shrinkage leads to the overestimation of conversion rate for its inaccurate estimation of surface area for ***,the influence of volume shrinkage on the reaction is found smaller in the scaled-up reactor.

关键词： Heterogeneous flow structure Chemical reaction kinetics CFD Bubbling fluidized bed Pyrolusite reduction reaction

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Indentation of a Plate on a Thin Transversely Isotropic Elastic Layer

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Acta Mechanica Solida Sinica 2025年第2期38卷 331-340页

作者： Juyao Li Guozheng Zhang Liu Wang Zhaohe Dai State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of EngineeringPeking UniversityBeijing100871China CAS Key Laboratory of Mechanical Behaviour and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei230026AnhuiChina State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of ScienceBeijing100190China

This work investigates the indentation response of an elastic plate resting upon a thin,transversely isotropic elastic layer supported by a rigid *** a scenario is encountered across a range of length scales from piezoresistive tests on graphite nanoflakes to the bending of floating ice shelves atop seabed,where the elastic layer commonly exhibits certain *** first develop an approximate model to describe the elastic response of a transversely isotropic layer by exploiting the slenderness of the *** show that this approximate model can be reduced to the classic compressible Winkler foundation model as the elastic constants of the layer are set *** then investigate the combined response of an elastic plate on the transversely isotropic elastic *** by the simplicity of our proposed approximate model,we can derive simple analytical solutions for the cases of small and large indenter *** analytical results agree well with numerical calculations obtained via finite element methods,as long as the system is sufficiently slender in a mechanical *** results offer quantitative insights into the mechanical behavior of numerous semiconductor materials characterized by transverse isotropy and employed with slender geometries in various practical applications where the thin layer works as conductive and functional layers.

关键词： Indentation Elastic layers-Transversely isotropic Winkler foundation Graphite

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Phase-field modeling of faceted growth in solidification of alloys

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Chinese Physics B 2022年第4期31卷 706-709页

作者： Hui Xing Qi An Xianglei Dong Yongsheng Han The Key Laboratory of Space Applied Physics and Chemistry Northwestern Polytechnical UniversityXi’an 710029China College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China The EMMS Group State Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

A regularization of the surface tension anisotropic function used in vapor-liquid-solid nanowire growth was introduced into the quantitative phase-field model to simulate the faceted growth in solidification of *** results show that the value of δ can only affect the region near the tip,and the convergence with respect to δ can be achieved with the decrease of δ near the *** can be found that the steady growth velocity is not a mo no tonic function of the cusp amplitude,and the maximum value is approximately at ε=0.8 when the supersaturation is ***,the growth velocity is an increasing function of supersaturation with the morphological transition from facet to dendrite.

关键词： faceted growth dendrite phase-field model

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