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In-situ Dendrite/Metallic Glass Matrix composites:A Review

Journal of Materials Science & Technology 2013年第8期29卷 685-701页

作者： Junwei Qiao Laboratory of Applied Physics and Mechanics of Advanced Materials College of Materials Science and EngineeringTaiyuan University of Technology

The advanced fabrication of in-situ dendrite/metallic glass matrix （MGM） composites is reviewed. Herein, the semi- solid processing and Bridgman solidification are two methods, which can make the dendrites homogeneously dispersed within the metallic glass matrix. Upon quasi-static compressive loading at room temperature, almost all the in-situ composites exhibit improved plasticity, due to the effective block to the fast propagation of shear bands. Upon quasi-static tensile loading at room temperature, although the composites possess tensile ductility, the inhomogeneous deformation and associated softening dominates. High volume-fractioned dendrites and network structures make in-situ composites distinguishingly plastic upon dynamic compression. In-situ composite exhibits high tensile strength and softening （necking） in the supercooled liquid region, since the presence of high volume-fractioned dendrites lowers the rheology of the viscous glass matrix at high temperatures. At cryogenic temperatures, a distinguishingly-increased maximum strength is available; however, a ductile-to-brittle transition seems to be present by lowering the temperature. Besides, improved tension-tension fatigue limit of 473 MPa and four-point-bending fatigue limit of 567 MPa are gained for Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0 MGM composites. High volume-fraction dendrites within the glass matrix induce increased effectiveness on the blunting and propagating resistance of the fatigue-crack tip. The fracture toughness of in-situ composites is comparable to those of the toughest steels and crystalline Ti alloys. During steady-state crack-growth, the confinement of damage by in-situ dendrites results in enhancement of the toughness.

关键词： Bulk metallic glasses composites Mechanical properties Dynamic loading Microstructures Shear bands

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Third-order nonlinear optical properties of graphene composites:A review

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Chinese Physics B 2021年第8期30卷 120-131页

作者：尚萌李培玲王玉华罗经纬 Hubei Province Key Laboratory of Science in Metallurgical Process Wuhan University of Science and TechnologyWuhan 430081 China

Graphene has excellent thirdorder nonlinear optical(NLO)properties due to its unique electronic band structure and wideband gap *** paper focuses on the research progress of graphene and its composite materials in nonlinear optics in recent *** this review,recent results on graphene(or graphene oxide)-metal nanoparticles(G-MNPs),graphene-metal-oxide nanoparticles(G-MONPs),graphene-metal sulfide nanoparticles(G-MSNPs),and graphene-organic molecular composites(G-OM)have been *** addition,the enhancement mechanism of nonlinear absorption(NLA)and optical limiting(OL)have also been covered.

关键词： graphene composites nonlinear optics optical limiting enhancement

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Characterizations on Mechanical Properties and In Vitro Bioactivity of Biomedical Ti–Nb–Zr–CPP composites Fabricated by Spark Plasma Sintering

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Acta Metallurgica Sinica(English Letters) 2016年第11期29卷 1073-1080页

作者： Zheng-Yuan He Lei Zhang Wen-Rui Shan Yu-Qin Zhang Ye-Hua Jiang Rong Zhou Jun Tan School of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093China National-local Joint Engineering Laboratory of Metal Advanced Solidification Forming and Equipment Technology Kunming 650093 China Engineering Technology Research Center of Titanium Products and Application of Yunnan Province Kunming 650093 China IFW Dresden Institute for Complex MaterialsP.O. Box 27 01 16 01171 Dresden Germany

To alleviate the bio-inert of Ti alloys as hard tissue implants, Ti–35Nb–7Zr–xCPP（calcium pyrophosphate,x = 5, 10, 15, 20 wt%） composites were prepared by mechanical alloying（MA） and following spark plasma sintering（SPS）. Mechanical behaviours and in vitro bioactivity of these composites were investigated systematically. Results showed that the composites consisted of β-Ti matrix, α-Ti, and metal–ceramic phases such as CaO, CaTiO3, CaZrO3, and TixPy. With increasing CPP content, the composites had higher strength（over 1500 MPa） and higher elastic modulus, but suffered almost zero plastic deformation together with lower relative density. When the CPP contents were 5 and 10 wt%,the compressive elastic moduli were 44 and 48 GPa, respectively, which were close to those of natural bones. However, the compressive elastic modulus of the composites increased significantly when CPP contents exceed 10 wt%, thus deteriorating the mechanical compatibility of the composites owing to more α-Ti and metal–ceramic phases. Besides, the surface of Ti–35Nb–7Zr–10CPP composite was deposited as a homogeneous apatite layer during soaking in simulated body fluid（SBF）. It indicates a good bioactivity between the implant materials and living bones.

关键词： composites Spark plasma sintering Microstructure Mechanical behaviours Bioactivity

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Enhancing both strength and toughness of carbon/carbon composites by heat-treated interface modification

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Journal of Materials Science & Technology 2019年第3期35卷 383-393页

作者： Jiajia Sun Hejun Li Liyuan Han Qiang Song State Key Laboratory of Solidification Processing Northwestern Polytechnical University

A simple method to increase both strength and toughness of carbon/carbon(C/C) composites is *** method is based on the heat treatment of the pre-deposited thin carbon coating, leading to the formation of more orderly pyrolytic carbon(PyC) as a functional interlayer between fiber and matrix that could optimize the interfacial sliding strength in C/C composites. Effects of such a heat-treated PyC layers on the microstructure, tensile strength and fracture behavior of unidirectional C/C composites were investigated. Results showed that although the in-situ fiber strength was deteriorated after the introduction of interfacial layer, tensile strength of the specimen was greatly improved by 38.5% compared with pure C/C composites without any treatment. The interfacial sliding stress sharply decreased, which was interpreted from finite element analysis and verified by Raman spectra. Therefore, the fracture behavior was changed from brittle fracture to multiple-matrix cracking induced non-linear mechanical ***, the ultimate strength can be predicted by different models according to the interfacial sliding stress. Our research would provide a meaningful way to improve both strength and toughness of C/C composites.

关键词： Carbon/carbon composites Tensile strength Interface Heat treatment

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A machine learning framework for damage mechanism identification from acoustic emissions in unidirectional SiC/SiC composites

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npj Computational Materials 2021年第1期7卷 1326-1335页

作者： C.Muir B.Swaminathan K.Fields A.S.Almansour K.Sevener C.Smith M.Presby J.D.Kiser T.M.Pollock S.Daly Materials University of California-Santa BarbaraSanta BarbaraCAUSA Mechanical Engineering University of California-Santa BarbaraSanta BarbaraCAUSA NASA Glenn Research Center ClevelandOHUSA Materials Science and Engineering University of Michigan-Ann ArborAnn ArborMIUSA

In this work,we demonstrate that damage mechanism identification from acoustic emission(AE)signals generated in minicomposites with elastically similar constituents is *** waveforms were generated by SiC/SiC ceramic matrix minicomposites(CMCs)loaded under uniaxial tension and recorded by four sensors(two models with each model placed at two ends).Signals were encoded with a modified partial power scheme and subsequently partitioned through spectral *** cracking and fiber failure were identified based on the frequency information contained in the AE event they produced,despite the similar constituent elastic properties of the matrix and ***,the resultant identification of AE events closely followed CMC damage chronology,wherein early matrix cracking is later followed by fiber breaks,even though the approach is fully domain-knowledge ***,the partitions were highly precise across both the model and location of the sensors,and the partitioning was *** presented approach is promising for CMCs and other composite systems with elastically similar constituents.

关键词： composites damage mechanism

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Graphene oxide wrapped magnetic nanoparticle composites induced by SiO_(2) coating with excellent regenerability

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International Journal of Minerals,Metallurgy and Materials 2021年第12期28卷 2001-2007页

作者： Zhong-liang Hu Hou-quan Cui Yan-huai Ding Jing-ying Li Yi-rong Zhu Zhao-hui Li College of Metallurgy and Material Engineering Hunan University of TechnologyZhuzhou 412007China College of Chemistry Xiangtan UniversityXiangtan 411105China Institute of Fundamental Mechanics and Materials Engineering Xiangtan UniversityXiangtan 411105China

Graphene oxide(GO)wrapped Fe_(3)O_(4) nanoparticles(NPs)were prepared by coating the Fe_(3)O_(4) NPs with a SiO_(2) layer,and then modifying by amino groups,which interact with the GO nanosheets to form covalent *** SiO_(2) coating layer plays a key role in integrating the magnetic nanoparticles with the GO *** effect of the amount of SiO_(2) on the morphology,structure,adsorption,and regenerability of the composites was studied in *** appropriate SiO_(2) layer can effectively induce the GO nanosheets to completely wrap the Fe_(3)O_(4) NPs,forming a core-shell Fe_(3)O_(4)@SiO_(2)@GO composite where Fe_(3)O_(4)@SiO_(2) NPs are firmly encapsulated by GO *** optimized Fe_(3)O_(4)@SiO_(2)@GO sample exhibits a high saturated adsorption capacity of 253 mg·g^(-1) Pb(Ⅱ)cations from wastewater,and the adsorption process is well fitted by Langmuir adsorption ***,the composite displays excellent regeneration,maintaining a~90%adsorption capacity for five cycles,while other samples decrease their adsorption capacity *** work provides a theoretical guidance to improve the regeneration of the GO-based adsorbents.

关键词： composites composite coating

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Cu-(B4C)p metal matrix composites processed by accumulative rollbonding

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Progress in Natural Science:Materials International 2016年第6期26卷 613-620页

作者： S.Mansourzadeh M.Hosseini E.Salahinejad A.H.Yaghtin Department of Materials Science and Engineering College of Chemical and Metallurgical EngineeringShiraz BranchIslamic Azad University Department of Materials Science and Engineering School of EngineeringShiraz University Faculty of Materials Science and Engineering K.N.Toosi University of Technology

In this study, Cu/B4C metal matrix composites were prepared by accumulative roll-bonding(ARB). The microstructure of the processed samples was characterized by TEM, SEM and optical microscopy. The microhardness, uniaxial tensile and four-point probe tests were carried out to evaluate the mechanical properties and electrical resistivity of the ARBed monolithic and composite samples. The results showed that the reinforcement distribution was improved by increasing ARB cycles, which was quantitatively confirmed by some models. Based on TEM observations, the formation of an ultrafine grained structure in the composite matrix was also approved. It was shown that with increasing ARB cycles, the microhardness and tensile strength of the monolithic Cu samples were enhanced up to the 3rd cycle and then saturated, but the microhardness and tensile strength of the composites showed an increasing trend to the last cycle. Apart from a substantial improvement in the mechanical properties of the Cu/B4C composites, a minor decrement in electrical conductivity was detected after six ARB cycles.

关键词： Electron microscopy Mechanical characterization composites

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Excellent Terahertz shielding performance of ultrathin flexible Cu/graphene nanolayered composites with high stability

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Journal of Materials Science & Technology 2020年第17期52卷 136-144页

作者： Shengyue Hou Wenle Ma Guanghao Li Yi Zhang Yunyun Ji Fei Fan Yi Huang National Institute for Advanced Materials Tianjin Key Laboratory of Metal and Molecule Based Material ChemistryKey Laboratory of Functional Polymer MaterialsCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)School of Materials Science and EngineeringNankai UniversityTianjin 300350China Beijing Institute of Aeronautical Materials Beijing 100095China Institute of Modern Optics Nankai UniversityTianjin 300350China

Electromagnetic interference(EMI)shielding at Terahertz(THz)frequency range attracts increasing attention due to the rapid development of THz science and *** shielding materials with small thickness,high shielding effectiveness(SE),good flexibility and stability are highly ***,an ultrathin flexible copper/graphene(Cu/Gr)nanolayered composite are prepared,which can reach the average EMI SE of 60.95 dB at 0.1–1.0 THz with a thickness of only 160 nm,indicating that more than 99.9999%of the THz wave power can be ***,the Cu/Gr nanolayered composite also exhibits excellent oxidation resistance,with a 93.09%maintenance rate for EMI SE value after heating at 120℃for 3 h in air,far higher than that of the bare Cu film(62.15%).Besides,the Cu/Gr nanolayered composite exhibits good mechanical flexibility and flexural fatigue *** EMI SE value of the Cu/Gr nanolayered composite shows a maintenance rate of 98.87%even after 1500 times bending cycles,obviously higher than that of multilayer Cu film(93.07%).These results demonstrate that the ultrathin flexible Cu/Gr nanolayered composites with excellent shielding performance and good stability have a broad application prospect in THz shielding for wearable devices and next generation mobile communication equipment.

关键词： Terahertz shielding Ultrathin flexible Cu/grapheme nano composites High stability

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Effect of Different Reinforcing Fillers on Properties,Interfacial Compatibility and Weatherability of Wood-plastic composites

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Journal of Bionic Engineering 2019年第2期16卷 337-353页

作者： Xiaoqian Wang Zhiming Yu Armando G.McDonald MOE Key Laboratory of Wooden Material Science and Application Beijing Forestry UniversityQinghua East Road No.35Beijing 100083China Renewable Materials Program Department of ForestRangelandand Fire SciencesUniversity of Idaho875 Perimeter Drive MS 1133MoscowIdaho 83844-1133USA

Utilization of biochar in plastic based blends offers a sustainable way to renewable materials as well as value-added use of wood *** investigate the interfacial compatibility and weatherability properties of biochar composites,four types of Wood-Plastic composites(WPC)were prepared by an extrusion *** mechanical properties,water absorptions,thermal and viscoelastic properties,and rheological behavior of the composites were also *** decolorizing carbon(NA)composite melts showed the higher modulus and viscosity,indicating better melt *** NA composites performed the best in tensile properties(strength of 2&6 MPa and modulus of 3.4 GPa)and had strong interfacial interaction between particles and the *** degree of HDPE crystallinity in the biochar and carbon composites decreased relative to Douglas-fir(DF)composites,while the thermal properties of the composites improved compared with DF *** the water resistance,the DF composites displayed the highest water absorption(3.7%)and thickness swell(2.9%).During accelerated weathering tests,longer exposure time increased the color change and lightness,especially for DF *** and biochar composites resulted in improved *** study opens up a pathway to utilize effectively the renewable biochar as reinforcing filler in WPC in outdoor applications.

关键词： biochar interfacial compatibility accelerated weathering wood-plastic composites

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Thermodynamic and structural properties of polystyrene/C60 composites: A molecular dynamics study

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Chinese Physics B 2020年第2期29卷 224-230页

作者：杨俊升朱子亮黄多辉曹启龙 Computational Physics Key Laboratory of Sichuan Province Yibin UniversityYibin 644000China Weifang University of Science and Technology Shouguang 262700China

To tailor properties of polymer composites are very important for their *** small concentrations of nanoparticles can significantly alter their physical *** this work,molecular dynamics simulations are performed to study the thermodynamic and structural properties of polystyrene/C60(PS/C60)*** calculated densities,glass transition temperatures,and coefficient of thermal expansion of the bulk PS are in agreement with the experimental data available,implying that our calculations are *** find that the glass transition temperature Tg increases accordingly with an added concentration of C60 for PS/C60 ***,the self-diffusion coefficient D decreases with increase of addition of *** the volumetric coefficients of thermal expansion(CTE)of bulk PS and PS/C60 composites,it can be seen that the CTE increases with increasing content of C60 above Tg(rubbery region).However,the CTE decreases with increasing content of C60 below Tg(glassy region).

关键词： polystyrene/C60 composites molecular dynamics glass transition diffusion

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