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Additive manufacturing of metals:Microstructure evolution and multistage control

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Journal of Materials Science & Technology 2022年第5期100卷 224-236页

作者： Zhiyuan Liu Dandan Zhao Pei Wang Ming Yan Can Yang Zhangwei Chen Jian lu zhaoping lu Additive Manufacturing Institute College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Sino-German College of Intelligent Manufacturing Shenzhen Technology UniversityShenzhen 518118China CityU-Shenzhen Futian Research Institute Shenzhen 518045China Hong Kong Branch of National Precious Metals Material Engineering Research Center(NPMM) City University of Hong KongHong KongChina Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

As a revolutionary industrial technology,additive manufacturing creates objects by adding materials layer by layer and hence can fabricate customized components with an unprecedented degree of *** metallic materials,unique hierarchical microstructures are constructed during additive manufacturing,which endow them with numerous excellent *** take full advantage of additive manufacturing,an in-depth understanding of the microstructure evolution mechanism is *** this end,this review explores the fundamental procedures of additive manufacturing,that is,the formation and binding of melt pools.A comprehensive processing map is proposed that integrates melt pool energy-and geometry-related process parameters *** on it,additively manufactured microstructures are developed during and after the solidification of constituent melt *** solidification structures are composed of primary columnar grains and fine secondary phases that form along the grain *** post-solidification structures include submicron scale dislocation cells stemming from internal residual stress and nanoscale precipitates induced by intrinsic heat treatment during cyclic heating of adjacent melt *** on solidification and dislocation theories,the formation mechanisms of the multistage microstructures are thoroughly analyzed,and accordingly,multistage control methods are *** addition,the underlying atomic scale structural features are briefly ***,microstructure design for additive manufacturing through adjustment of process parameters and alloy composition is addressed to fulfill the great potential of the *** review not only builds a solid microstructural framework for metallic materials produced by additive manufacturing but also provides a promising guideline to adjust their mechanical properties.

关键词： Additive manufacturing Metallic materials Melt pool Processing map Microstructure evolution

A general and transferable deep learning framework for predicting phase formation in materials

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npj Computational Materials 2021年第1期7卷 89-98页

作者： Shuo Feng Huadong Fu Huiyu Zhou Yuan Wu zhaoping lu Hongbiao Dong School of Engineering University of LeicesterLeicester LE17RHUK Beijing Advanced Innovation Center of Materials Genome Engineering University of Science and Technology Beijing100083 BeijingChina School of Informatics University of LeicesterLeicester LE17RHUK State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing100083 BeijingChina

Machine learning has been widely exploited in developing new ***,challenges still exist:small dataset is common for most tasks;new datasets,special descriptors and specific models need to be built from scratch when facing a new task;knowledge cannot be readily transferred between independent *** this paper we propose a general and transferable deep learning(GTDL)framework for predicting phase formation in *** proposed GTDL framework maps raw data to pseudoimages with some special 2-D structure,e.g.,periodic table,automatically extracts features and gains knowledge through convolutional neural network,and then transfers knowledge by sharing features extractors between *** of the GTDL framework in case studies on glass-forming ability and high-entropy alloys show that the GTDL framework for glass-forming ability outperformed previous models and can correctly predicted the newly reported amorphous alloy systems;for high-entropy alloys the GTDL framework can discriminate five types phases(BCC,FCC,HCP,amorphous,mixture)with accuracy and recall above 94%in fivefold *** addition,periodic table knowledge embedded in data representations and knowledge shared between models is beneficial for tasks with small *** method can be easily applied to new materials development with small dataset by reusing well-trained models for related materials.

关键词： materials alloys alloy

Eight in one:high-entropy-alloy nanoparticles synthesized by carbothermal shock

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Science Bulletin 2018年第12期63卷 737-738页

作者： Yuan Wu Zhifeng Lei Xiongjun Liu Hui Wang zhaoping lu State Key Laboratory for Advanced Metals and Materials University of science and Technology Beijing

Since the Bronze Age to the early 21st century,development of metals and alloys have been limited to one principal element with minor addition of relatively small amounts of other elements,such as steels,titanium allo... 详细信息

关键词：钛合金青铜时代原子部分元素铝合金基础金属钢

Local chemical ordering and its impact on radiation damage behavior of multi-principal element alloys

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Journal of Materials Science & Technology 2023年第4期135卷 13-25页

作者： Leqing Liu Xiongjun Liu Qing Du Hui Wang Yuan Wu Suihe Jiang zhaoping lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

Multi-principal element alloys(MPEAs)have attracted much attention as future nuclear materials due to their extraordinary radiation *** this work,we have elucidated the development of local chemical orderings(LCOs)and their influences on radiation damage behavior in the typical CrFeNi MPEA by hybrid-molecular dynamics and Monte Carlo *** was found that considerable LCOs consist-ing of the Cr-Cr and Ni-Fe short-range orders existed in the ordered configuration with optimized system *** modeling the accumulation cascades up to 1000 recoils,we revealed that the size of de-fect clusters and dislocation loops is smaller in the ordered configuration than those in the random one,although the former formed more Frenkel pairs(i.e.,self-interstitials and vacancies).In addition,the dis-tribution of dislocation loops is relatively more dispersed in the ordered configuration,and the stair-rod dislocations related to irradiation swelling are also smaller,implying that the existence of LCOs is con-ducive to enhancing radiation damage *** understand the underlying mechanism,the effects of LCOs on the formation and evolution of defects and radiation resistance were discussed from the aspects of atomic bonding,migration path,and energy of defect diffusion,which provides theoretical guidance for the design of MPEAs with enhanced radiation resistance.

关键词： Multi-principal element alloys Local chemical ordering Radiation damage Dislocation evolution Molecular dynamics simulation

A new many-body potential with the second-moment approximation of tight-binding scheme for Hafnium

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Science China(Physics,Mechanics & Astronomy) 2013年第11期56卷 2071-2080页

作者： LIN DeYe WANG Yi SHANG ShunLi lu zhaoping LIU ZiKui HUI XiDong State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Department of Materials Science and Engineering the Pennsylvania Sate UniversityUniversity Park

In this work,we develop a new many-body potential for alpha-hafnium(α-Hf)based on the second moment approximation of tight-binding(TB-SMA)theory by introducing an additional Heaviside step function into the potential model and a new analytical scheme of density *** the parameters of the new potential have been systematically evaluated by fitting to ground-state properties including cohesive energy,lattice constants,elastic constants,vacancy formation energy,structure stability and equation of *** using the present model,the melting point,melt heat,thermal expansion coefficient,point defects,and low-index surface energies ofα-Hf were calculated through molecular dynamics *** with experiment observations from others,it is shown that these properties can be reproduced reasonably by the present model,some results being more consistent to the experimental data than those by previous suggested *** indicates that this work is sutiable in TB-SMA potential for hexagonal close packed metals.

关键词： many-body potentials second moment approximation of the tight-binding scheme molecular dynamics simulation lattice defects hafnium

Enhancing properties of high-entropy alloys via manipulation of local chemical ordering

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Journal of Materials Science & Technology 2024年第13期180卷 23-31页

作者： Yihan Wang Meiyuan Jiao Yuan Wu Xiongjun Liu Hui Wang Suihe Jiang Xiaobin Zhang zhaoping lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

*** High entropy alloys(HEAs),arising from the incorporation of multiple principal elements[1,2],have garnered extensive atten-tion due to their great potential to be utilized under extreme con-ditions[3-5].

关键词： alloys entropy utilized

Highly collective atomic transport mechanism in high-entropy glass-forming metallic liquids

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Journal of Materials Science & Technology 2019年第1期35卷 44-47页

作者： Changjiu Chen Kaikin Wong Rithin P.Krishnan Lei Zhifeng Dehong Yu zhaoping lu Suresh M.Chathoth Department of Physics City University of Hong Kong State Key Laboratory for Advanced Metals and Materials University of Science and TechnologyBeijing Australian Nuclear Science and Technology Organization

Quasielastic neutron scattering(QENS) has been used to study the atomic relaxation process and microscopic transport mechanism in high-entropy glass-forming metallic(HE-GFM) liquids. Self-intermediate scattering functions obtained from the QENS data show unusually large stretching, which indicates highly heterogeneous atomic dynamics in HE-GFM liquids. In these liquids, a group of atoms over a length scale of about 21 ? diffuses collectively even well above the melting temperature. However, the temperature dependence of diffusion process in one of the HE-GFM liquid is Arrhenius, but in the other HE-GFM liquid it is non-Arrhenius. Although the glass-forming ability of these HE-GFM liquids is very poor, the diffusion coefficients obtained from the QENS data indicate the long range atomic transport process is much slower than that of the best metallic glass-forming liquids at their melting temperatures.

关键词： High-entropy alloy Neutron scattering Atomic relaxation Diffusion

Bulk ultrafine grained microstructures with high thermal stability via intragranular precipitation of coherent particles

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Journal of Materials Science & Technology 2024年第14期181卷 220-230页

作者： Shenglong Liang Xiaochun Liu Suihe Jiang Huihui Zhu Wei Li Leqing Liu Xiongjun Liu Yuan Wu Xiaobin Zhang Hui Wang zhaoping lu Beijing Advanced Innovation Centre for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Yangjiang Branch Guangdong Laboratory for Materials Science and Technology(Yangjiang Advanced Alloys Laboratory)Yangjiang 529500China Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410000China Liaoning Academy of Materials Shenyang 110000China Inner Mongolia University of science and technology Instrumental Analysis CenterBaotou 014000China

Producing ultrafine-grained(UFG)microstructures with enhanced thermal stability is an important yet challenging route to further improve mechanical properties of structural ***,a high-performance bulk UFG copper that can stabilize even at temperatures up to 750℃(∼0.75 T m,T m is the melting point)was fabricated by manipulating its recrystallization behavior via low alloying of *** of 1 wt.%–1.5 wt.%of Co can trigger quick and copious intragranular clustering of Co atoms,which offers high Zener pinning pressure and pins the grain boundaries(GBs)of freshly recrystallized ul-trafine *** to the fact that the subsequent growth of the coherent Co-enriched nanoclusters was slow,sufficient particles adjacent to GBs remained to inhibit the migration of GBs,giving rise to the UFG microstructure with prominently high thermal *** work manifests that the strategy for pro-ducing UFGs with coherent precipitates can be applied in many alloy systems such as Fe-and Cu-based,which paves the pathway for designing advanced strain-hardenable UFGs with plain compositions.

关键词： Copper alloys Coherent precipitation Ultrafine-grained materials Recrystallization Microstructural stability

Relationship between composite structures and compressive properties in CuZr-based bulk metallic glass system

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Chinese Science Bulletin 2011年第36期56卷 3960-3964页

作者： WU Yuan SONG WenLi ZHANG ZhongYan HUI XiDong MA Dong WANG XunLi SHANG XinCun lu zhaoping State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China Neutron Scattering Science Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Mathematics and Mechanics University of Science and Technology Beijing Beijing 100083 China

Bulk metallic glass (BMG) composites with the austenite B2 phase as reinforcement macroscopically showed strain hardening behavior due to the plasticity induced by martensitic transformation during deformation. Relationship between characteristics of the B2-CuZr reinforcing phase and uniaxial compressive properties of CuZr-based BMG composites was studied. Mechanical properties of these BMG composites were found to depend on not only the reinforced phases but also the amorphous matrix,and the yield and fracture strength can be roughly estimated by the rule of mixture principle. Distribution of the reinforced B2-CuZr phase has an important impact on the compressive plasticity even for the composites with a similar volume fraction of the crystalline phase.

关键词：复合材料结构大块金属玻璃压缩性能相变诱导塑性非晶复合材料应变硬化变形过程机械性能