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Mechanical property and cellular structure of an additive manufactured FeCoNiCrMo_(0.2) high-entropy alloy at high-velocity deformation

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Journal of Materials Science & Technology 2023年第8期139卷 156-166页

作者： Wenshu Li YiYu Huang ZhongHao Xie Haoyu Chen Weihua Li Bin Liu Bingfeng Wang State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China School of Materials Science and Engineering Central South UniversityChangsha 410083China

The microstructural modification for cellular structures can achieve the improvement of dynamic me-chanical properties of a selective laser melted FeCoNiCrMo_(0.2)high-entropy alloy(SLM-FeCoNiCrMo_(0.2)HEA)and can expand its promising applications in the field of high-velocity *** this work,FeCoNiCrMo_(0.2)HEAs with cellular structures in different sizes were produced by selective laser melt-ing(SLM)with different process *** dynamic mechanical properties and microstructure of the SLM-FeCoNiCrMo_(0.2)HEA were *** dynamic mechanical properties of the SLM-FeCoNiCrMo_(0.2)HEA increased with decrease of average size of cellular structures,and the values of them were sensitive to strain *** energy absorption,compressive strength and yield strength of the SLM-FeCoNiCrMo_(0.2)HEAs reached 315.6 MJ/m^(3),2.2 GPa and 775.6 MPa,respectively at a strain rate of 2,420 s^(−1),under the process parameters of laser power and scanning speed of 330 W and 800 mm/s,respectively,where the corresponding average size of cellular structures in the HEAs was 483.6 *** value of strain-hardening rate of the SLM-FeCoNiCrMo_(0.2)HEA was about 5.1 GPa at a strain level of 0.1,which was much higher than that of the powder-metallurgy FeCoNiCrMo_(0.2)*** cellular structure was formed inside the molten pool with segregation of Mo on the *** localization appeared in the cellular structures,forming several deformation bands after high strain-rate *** elemental segre-gation strengthening and dislocation strengthening are considered to be the main strengthening mecha-nisms in SLM-FeCoNiCrMo_(0.2)HEA.

关键词： FeNiCr-based HEA Additive manufacturing Mechanical property cellular structure Strengthening mechanisms

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Effect of film types on thermal response,cellular structure,forming defects and mechanical properties of combined in-mold decoration and microcellular injection molding parts

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Journal of Materials Science & Technology 2021年第33期92卷 98-108页

作者： Wei Guo Zhihui Yu Wenting Wei Zhenghua Meng Huajie Mao Lin Hua School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Advanced Technology for Automotive Components(Wuhan University of Technology) Wuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China Hubei Research Center for New Energy&Intelligent Connected Vehicle Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Different types of polymer films were used in the combined in-mold decoration and microcellular injection molding(IMD/MIM)*** multiphase fluid-solid coupled heat transfer model was established to study the thermal response at the melt filling stage in the IMD/MIM *** was found that the temperature distributed asymmetrically along the thickness direction due to the changed heat transfer coefficient of the melt on the film *** polyethylene terephthalate(PET)films were applied,the temperature of the melt-film interface increased faster and to be higher at the end of melt filling stage in comparison with the application of polycarbonate(PC)and thermoplastic polyurethane(TPU)*** the effects of film types on the cellular structure,forming defects and mechanical properties of IMD/MIM parts were also studied *** results showed that the film types had no obvious effect on the cells size in the transition layer and the mechanical properties of the *** certain film thickness,the offset distance of core layer was the largest with PET film used,while the offset distance was the smallest with TPU film *** similar results were found for the warpage of the ***,an exactly opposite change occurred for the thickness of film-side transition layer and the bubble marks on the surface of the parts.

关键词： Microcellular injection molding In-mold decoration Thermal response cellular structure Forming defects Mechanical properties

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Effect of cellular structure on Mechanical Properties of Polyurethane Foam Curing Materials

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Journal of Wuhan University of Technology(Materials Science) 2019年第6期34卷 1371-1375页

作者： ZHENG Xinguo LIU Yaxun ZHANG Jinyong REN Lin WANG Weimin School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Railway Engineering Research Institute China Academy of Railway Sciences Co.LtdBeijing 100081China School of Science Wuhan University of TechnologyWuhan 430070China

Based on the mechanical properties and microstructure of polyurethane foam solidified material, a two-dimensional model of polyurethane foam solidified material was constructed. Polyurethane foam was obtained by fully and uniformly mixing the two components. The research was carried out through the combination of experimental test and finite element simulation. The experimental results show that when the pore density is constant, the size of the bubble hole is an important factor affecting the mechanical properties of the model. The smaller the size of the bubble hole, the less likely it is to produce stress concentration inside the model, and the stronger the resistance to material deformation. Under the random distribution, the lower the density of the polyurethane cured material, the higher the probability of damage between the adjacent bubbles, which is not conducive to the stability of the material. The density of the cured material should not be lower than 199 kg/m^3.

关键词： polyurethane foam curing material cellular structure mechanical property

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A stochastic inverse modeling for 3D printed cellular structure with defects and microdefects

A stochastic inverse modeling for 3D printed cellular struct...

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第十一届南方计算力学学术会议（SCCM-11）

作者： Wen Pin Ye Hongling Yang Qingsheng Yang Chunhui College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology School of Computing Engineering and Mathematics University of Western Sydney

In this paper, a stochastic inverse approach is presented to predict the defect parameters in a 3D printed cellular structure without measuring the dimension when macroscopic properties are tested. Firstly, the cellular structure with random defects was modeled in statistics data from collected database. Numerical simulation by First-order Perturbation based Stochastic Homogenization method was then utilized to predict reliability of macroscopic compression stiffness. A stochastic inverse method was presented via occurring probability of fabricated specimen from predicted distribution database of macroscopic properties. Further, fabrication was conducted for numerical models with introduced defects by stereolithography and compression test was followed. Experimental results verified the probabilistic characteristic of macroscopic compressive stiffness. While a preserved structure was restored later in the verification of stochastic inverse method, a good agreement was obtained between the predicted structure and the fabricated one. This approach provides an efficient solution to make an inference of structural parameters for further analysis when structure can’t be detected in the practical sense.

关键词： Defect database 3D printing cellular structure Statistical analysis

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Design and mechanical properties analysis of a cellular Waterbomb origami structure

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Theoretical & Applied Mechanics Letters 2024年第3期14卷 193-202页

作者： Yongtao Bai Zhaoyu Wang Yu Shi School of Civil Engineering Chongqing UniversityChongqing 400045China Research Center of Steel structure Engineering Chongqing UniversityChongqing 400045China

cellular structures are commonly used to design energy-absorbing structures,and origami structures are becominga prevalent method of cellular structure *** paper proposes a foldable cellular structure based on theWaterbomb origami *** geometrical configuration of this structure is ***-static compressiontests of the origami tube cell of this cellular structure are conducted,and load-displacement relationship curvesare *** simulations are carried out to analyze the effects of aspect ratio,folding angle,thicknessand number of layers of origami tubes on initial peak force and specific energy absorption(SEA).Calculationformulas for initial peak force and SEA are obtained by the multiple linear regression *** degree ofinfluence of each parameter on the mechanical properties of the single-layer tube cell is *** resultsshow that the cellular structure exhibits negative stiffness and periodic load-bearing capacity,as well as foldingangle has the most significant effect on the load-bearing and energy-absorbing *** adjusting the designparameters,the stiffness,load-bearing capacity and energy absorption capacity of this cellular structure can beadjusted,which shows the programmable mechanical properties of this cellular *** foldability andthe smooth periodic load-bearing capacity give the structure potential for application as an energy-absorbing structure.

关键词： cellular structure Waterbomb origami Mechanical metamaterial Numerical simulation Energy absorption

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Multifunctional cellular carbon foams derived from chitosan toward self-cleaning, thermal insulation, and highly efficient microwave absorption properties

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Nano Research 2024年第3期17卷 927-938页

作者： Beibei Zhan Yanling Hao Xiaosi Qi Yunpeng Qu Junfei Ding Jing-liang Yang Xiu Gong Yanli Chen Qiong Peng Wei Zhong College of Physics Guizhou Province Key Laboratory for Photoelectrics Technology and ApplicationGuizhou UniversityGuiyang 550025China Minzu Normal University of Xingyi Xingyi 562400China National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology Nanjing UniversityNanjing 210093China

To adapt the practical demand,designing and constructing the multifunctional microwave absorbers(MAs)is the key future direction of research and ***,effective integrating the multiple functions into a single material remains a huge ***,cellular carbon foams(CCFs)with different porous structures were elaborately designed and fabricated in high efficiency through a facile continuous freeze-drying and carbonization processes using a sustainable biomass chitosan as the *** obtained results revealed that the thermal treated temperature and g-C_(3)N_(4) amount played a great impact on the carbonization degrees,pore sizes,and morphologies of CCFs,which led to their tunable electromagnetic(EM)parameters,improved conduction loss,and polarization loss *** to the special cellular structure,the designed CCFs samples simultaneously displayed the strong absorption capabilities,broad absorption bandwidths,and thin matching ***,the as-prepared CCFs exhibited the strong hydrophobicity and good thermal insulation,endowing its attractive functions of self-cleaning and thermal ***,our findings not only presented a facile approach to produce different porous structures of CCFs,but also provided an effective strategy to develop multifunctional high-performance MAs on basis of three-dimensional CCFs.

关键词： multifunctional microwave absorbers carbon foams cellular structure self-cleaning thermal insulation

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Significant effect of ordered micro-domain on cell boundary phase distribution and demagnetization curve squareness of Sm_(2)Co_(17)-type magnet

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Rare Metals 2024年第4期43卷 1724-1735页

作者： Zhuang Liu Hai-Chen Wu Chao-Yue Zhang Chao-Qun Zhu Guo-Xin Chen Huan-Ming Lu Ren-Jie Chen Aru Yan CISRI&NIMTE Joint Innovation Center for Rare Earth Permanent Magnets Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China University of Chinese Academy of Sciences Beijing100049China Analytical Center Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China

Cu-rich cell boundary phase is difficult to precipitate evenly,resulting in a generally poor demagnetization curve squareness for Fe-rich Sm_(2)Co_(17)-type magnet,which is a key factor limiting the further improvement of magnetic energy *** this study,we report that nanoscale strip-like ordered micro-domains distributed in1:7H disordered matrix phase of the solid solution precursor is a new factor significantly affecting the precipitation and distribution of the cell boundary *** strip-like and continuous micro-twin structure with twin boundaries neatly perpendicular to the C-axis is observed after sintering *** solution treatment,sequential and long strip-like micro-twins gradually transform into disordered state along the basal plane,forming narrow disordered 1:7H(TbCu_(7)-type structure)phase between the separated strip-like ordered *** disordering transformation takes place via broken down of the long strip-like ordered micro-domains,which is accomplished by narrowing along the width direction followed by reduction of the ***,a new model revealing the effect of the ordered micro-domains on the formation of the cell boundary phase is *** boundaries enriched in Cu have already existed in the precursor with long strip-like ordered ***,the Cu-rich cell boundary phase acting as strong pinning centers cannot be precipitated homogeneously and distributed continuously after aging,resulting in a poor demagnetization curve squareness of Sm_(2)Co_(17)-type *** results indicate that significant broken down of the nanoscale ordered micro-domains in solution precursor is the key factor improving the distribution of cell boundary phase in Sm_(2)Co_(17)-type magnets.

关键词： Sm_(2)Co_(17) magnets Solution precursor Ordered micro-domains Disordering transformation cellular structure

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Effects of Reinforcement Content and Homogenization Treatment on the Microstructure and Mechanical Properties of in‑situ TiB_(2)/2219Al Composites

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1421-1437页

作者： Linwei Li Donghu Zhou Kai Zhao Lifeng Jiang Huijun Kang Enyu Guo Feng Mao Zongning Chen Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and TechnologyLuoyang 471003China Longmen Laboratory Luoyang 471000China

Obtaining an appropriate grain size is crucial for Al alloys or Al matrix composites prior to processing,as it significantly influences the mechanical properties of components and workability during the manufacturing ***_(2)particles are exceptional grain refiners in Al and serve as excellent reinforcement particles for particulate-reinforced aluminum matrix ***,the optimal particle content for achieving excellent refinement and strengthening effects depends on the matrix composition and requires further ***,homogenization is essential for mitigating the element segregation in the *** it is anticipated that adding suitable particles can effectively inhibit undesired grain growth during homogenization,comprehensive investigations on this aspect are currently ***,TiB_(2)/2219Al matrix composites with varying reinforcement contents(0,1,3,5 wt%)were fabricated through traditional casting followed by homogenization treatment to address these research *** effects of reinforcement content and homogenization treatment on the microstructure and mechanical properties of in-situ TiB_(2)/2219Al composites were *** results demonstrate a gradual strengthening of the refining effect with increasing particle ***,composites containing 3 wt%TiB_(2)particles exhibit superior comprehensive mechanical properties in both as-cast and homogenized ***,potential orientation relationships are observed and calculated between undissolved Al_(2)Cu eutectic phase and submicron or nanometer-sized TiB_(2)particles,resulting in a mixture structure with enhanced bonding *** mixture structure is continuously distributed along grain boundaries during solidification,forming a three-dimensional cellular network that acts as primary retarding forces for grain growth during ***,the established homogenization kinetic equations were further utilized to an

关键词： TiB_(2)/2219Al matrix composite Reinforcement content Homogenization treatment Homogenization kinetic cellular structure Mechanical property

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Electrochemical behavior of open-cellular structured Ti-6Al-4V alloy fabricated by electron beam melting in simulated physiological fluid:the significance of pore characteristics

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Journal of Materials Science & Technology 2022年第2期97卷 272-282页

作者： Xin Gai Rui Liu Yun Bai Shujun Li Yang Yang Shenru Wang Jianguo Zhang Wentao Hou Yulin Hao Xing Zhang Rui Yang R.D.K.Misra Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Department of Orthopedic Surgery Peking Union Medical College Hospital(PUMCH)Peking Union Medical College and Chinese Academy of Medical SciencesBeijing 100730China Department of Metallurgical Materialsand Biomedical EngineeringThe University of Texas at El Paso500W.University AvenueEl PasoTX 79968United States

The cellular structured titanium alloys have attracted significant attention for implants because of their lower Young’s modulus,which is comparable to human bone and has the capability of providing space for bone tissue ***,there is a gap in the knowledge in regard to the relationship between the pore characteristics and the electrochemical performance of open-cellular structured titanium *** this study,we elucidate the influence of pore characteristics on the electrochemical performance of open-cellular structured Ti-6Al-4V alloys produced by electron beam melting(EBM).Intriguingly,the passive film formed on cellular structured Ti-6Al-4V alloy with a larger pore size was more stable and protective,and the corrosion performance was superior compared to the samples with a smaller pore size in phosphate buffered saline(PBS),mainly because of relatively smaller exposed surface area and unlimited flow of ***,in acidic PBS containing fluoride ions,the pore characteristics did not play an important role in the corrosion *** was considered that the protective film breaks down such that the corrosion performance of cellular structured alloys was comparable to each other in this harsh environment.

关键词： cellular structure Ti-6Al-4V Electron beam melting Corrosion resistance Fluoride ion

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In-Plane and Out-of-Plane Mechanical Properties of Zero Poisson’s Ratio cellular structures for Morphing Application

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Transactions of Nanjing University of Aeronautics and Astronautics 2022年第3期39卷 326-337页

作者： SONG Leipeng LI Qiang WANG Hongjie WANG Taoxi NIE Xiaohua KONG Xiangsen SHEN Xing State Key Laboratory of Mechanics and Control of Mechanical structures Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China Beijing Institute of Space Long March Vehicle Beijing 100048P.R.China Computational structure Technique&Simulation Center Aircraft Strength Research Institute of ChinaXi’an 710065P.R.China

Intelligent structures like zero Poisson’s ratio(ZPR)cellular structures have been widely applied to the engineering fields such as morphing wings in recent decades,owing to their outstanding characteristics including light weight and low effective modulus. In-plane and out-of-plane mechanical properties of ZPR cellular structures are investigated in this paper. A theoretical method for calculating in-plane tensile modulus,in-plane shear modulus and out-of-plane bending modulus of ZPR cellular structures is proposed,and the impacts of the unit cell geometrical configurations on in-plane tensile modulus,in-plane shear modulus and out-of-plane bending modulus are studied systematically based on finite element(FE)simulation. Experimental tests validate the feasibility and effectiveness of the theoretical and FE analysis. And the results show that the in-plane and out-of-plane mechanical properties of ZPR cellular structures can be manipulated by designing cell geometrical parameters.

关键词： cellular structure zero Poisson’s ratio(ZPR) mechanical properties parameter design morphing application

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