The Experts below are selected from a list of 14877 Experts worldwide ranked by ideXlab platform
Min Song - One of the best experts on this subject based on the ideXlab platform.
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microstructures and mechanical properties of carbon nanotubes reinforced Pure Aluminum composites synthesized by spark plasma sintering and hot rolling
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Baisong Guo, Rujuan Shen, Zhonghua Tang, Min SongAbstract:Abstract In this study, flat products of carbon nanotubes (CNTs) reinforced Pure Aluminum (Al) composites were fabricated by spark plasma sintering and hot rolling. The effects of sintering temperature and CNTs content on the microstructures and mechanical properties of the composites were investigated. It has been shown that the composite reinforced by 0.75 vol% CNTs and sintered at 630 °C has the best comprehensive mechanical properties, due to the combined positive effects of the good Al-CNTs interfacial bonding, full densification of the composite and the uniform dispersion of the CNTs. It has been found that the load transfer strengthening and dispersion strengthening of CNTs are the dominant strengthening mechanisms in the composites. The study provides a guidance for manufacturing the flat products of Al/CNTs composites with high strength and good ductility.
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effect of particle size on the microstructures and mechanical properties of sic reinforced Pure Aluminum composites
Journal of Materials Engineering and Performance, 2011Co-Authors: Chao Sun, Min Song, Zhangwei WangAbstract:This article examined the effects of particle size and extrusion on the microstructures and mechanical properties of SiC particle-reinforced Pure Aluminum composites produced by powder metallurgy method. It has been shown that both particle size and extrusion have important effects on the microstructures and mechanical properties of the composites. The SiC particles distribute more uniformly when the ratio of the matrix powder size and SiC particle size approaches unity, and the smaller-sized SiC particles tend to cluster easily. The voids are found to coexist with the clustered and large-sized SiC particles, and they significantly decrease the density and mechanical properties of the composites. Extrusion can redistribute the SiC particles in the matrix and decrease the number of pores, thus make the SiC particles distribute more uniformly in the matrix, and enhance the interfacial bonding strength. The decrease in the SiC particle size improves the tensile strength and yield strength, but decreases the ductility of the composites.
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effect of particle size on the microstructures and mechanical properties of sic reinforced Pure Aluminum composites
Journal of Materials Engineering and Performance, 2011Co-Authors: Min Song, Zhangwei Wang, Yuehui HeAbstract:This article examined the effects of particle size and extrusion on the microstructures and mechanical properties of SiC particle-reinforced Pure Aluminum composites produced by powder metallurgy method. It has been shown that both particle size and extrusion have important effects on the microstructures and mechanical properties of the composites. The SiC particles distribute more uniformly when the ratio of the matrix powder size and SiC particle size approaches unity, and the smaller-sized SiC particles tend to cluster easily. The voids are found to coexist with the clustered and large-sized SiC particles, and they significantly decrease the density and mechanical properties of the composites. Extrusion can redistribute the SiC particles in the matrix and decrease the number of pores, thus make the SiC particles distribute more uniformly in the matrix, and enhance the interfacial bonding strength. The decrease in the SiC particle size improves the tensile strength and yield strength, but decreases the ductility of the composites.
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effects of die pressing pressure and extrusion on the microstructures and mechanical properties of sic reinforced Pure Aluminum composites
Materials & Design, 2010Co-Authors: Min SongAbstract:Abstract This paper studied the effects of die-pressing pressure and extrusion on the microstructures and mechanical properties of powder metallurgy fabricated SiC particle reinforced Pure Aluminum composites by optical microscopy, SEM microscope and mechanical testing machine. It has been shown that both extrusion and increasing die-pressing pressure can substantially improve the strength and plasticity of the composites since they decrease the number of microcrack initiators during deformation. The extrusion and increasing the die-pressing pressure decrease the number of pores and increase the density and interfacial bonding strength, and thus, improve the mechanical properties of the composites.
Z F Zhang - One of the best experts on this subject based on the ideXlab platform.
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effect of stress profile on microstructure evolution of cold drawn commercially Pure Aluminum wire analyzed by finite element simulation
Journal of Materials Science & Technology, 2017Co-Authors: Q Y Chen, Q Z Wang, H Y Yu, Runwei Li, Z J Zhang, G Zhang, Z F ZhangAbstract:Abstract The evolution of microstructure in the drawing process of commercially Pure Aluminum wire (CPAW) does not only depend on the nature of materials, but also on the stress profile. In this study, the effect of stress profile on the texture evolution of the CPAW was systematically investigated by combining the numerical simulation and the microstructure observation. The results show that the tensile stress at the wire center promotes the formation of texture, whereas the shear stress nearby the rim makes little contribution to the texture formation. Therefore, the texture at the wire center is stronger than that in the surface layer, which also results in a higher microhardness at the center of the CPAW under axial loading.
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fatigue and fracture behavior of a cold drawn commercially Pure Aluminum wire
Materials, 2016Co-Authors: Jiapeng Hou, H J Yang, Qiang Wang, Z F ZhangAbstract:Fatigue properties and cracking behavior of cold-drawn commercially Pure Aluminum wires (CPAWs) widely used as the overhead transmission conductors were investigated. It was found that the fracture surface of the CPAWs shows an obvious four-stage fracture characteristic, i.e., crack initiation, planar crack propagation, 45°-inclined crack propagation and final rapid fracture. The crack growth mechanisms for the CPAWs were found quite different from those for the conventional coarse-grained materials. The cracks in the CPAWs firstly grow along the grain boundaries (Stage I crack growth), and then grow along the plane of maximum shear stress during the last stage of cycling (Stage II crack growth), leading to the distinctive fracture surfaces, i.e., the granular surface in the planar crack propagation region and the coarse fatigue striations in the 45°-inclined crack propagation region. The grain boundary migration was observed in the fatigued CPAWs. The increase in fatigue load enhances the dislocation recovery, increases the grain boundary migration rate, and thus promotes the occurrence of softening and damage localization up to the final failure.
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microstructure evolution and strengthening mechanisms of cold drawn commercially Pure Aluminum wire
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2015Co-Authors: Jinliang Hou, Q M Wang, H J Yang, Z F ZhangAbstract:Abstract The tensile strength of cold-drawn commercially Pure Aluminum wire shows an obvious three-stage characteristic, including the first strengthening stage, steady stage and second strengthening stage, with increasing extrusion strain. The dislocation density, intensity of 〈111〉 texture and percentage of high-angle grain boundaries are apparently increased in the second strengthening stage. Consequently, the final strengthening mechanisms may be well explained by the existence of the high-density dislocation, the 〈111〉 texture and high-angle grain boundary.
Qijie Zhai - One of the best experts on this subject based on the ideXlab platform.
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refining of Pure Aluminum cast structure by surface pulsed magneto oscillation
Journal of Materials Processing Technology, 2012Co-Authors: Zhenxing Yin, Yongyong Gong, Y F Cheng, Dong Liang, Qijie ZhaiAbstract:Abstract A technique termed surface pulsed magneto-oscillation (SPMO) was developed for refining the solidification structure of metals and alloys. Its working principles are to allow an electropulse to pass through a cookie-like induction coil mounted on the top of a mold to produce pulsed electromagnetic fields (EMFs) which are expected to modify the solidification process and structure of ingots. The experimental results showed that an electropulse flowing in the induction coil can make Pure Aluminum cast structures transform radically from the columnar to equiaxed grains. In order to examine the origin of equiaxed grains, the steel gauze was applied to the mold to hinder the migration of free grains induced by the pulsed electromagnetic fields. Through comparison of cast structures it was showed that the equiaxed grains should originate from the upper surface of the melt and/or top mold wall. And the forced convection induced by the pulsed magneto-oscillation plays a vital role in the formation of cast structure.
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structure refinement of Pure Aluminum by pulse magneto oscillation
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008Co-Authors: Yongyong Gong, Jun Luo, Jinxian Jing, Zanqi Xia, Qijie ZhaiAbstract:Pulse magneto-oscillation (PMO) is developed as a novel technique to refine the solidification structure of Pure Aluminum, and its grain refinement mechanism is proposed based on the experiment. Experimental results indicate that PMO is an effective technique for the grain refinement of Pure Al which is achieved mainly due to the nucleus increase in the solidifying melt. When PMO is applied during the solidification process, the nucleus falls off the mould wall and drifts in the melt. Due to its distinctive refinement effect, flexibility, and environment-friendly features, PMO has potential application in controlling the solidification process of metals.
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research on solidification structure refinement of Pure Aluminum by electric current pulse with parallel electrodes
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008Co-Authors: Yulai Gao, Qijie ZhaiAbstract:Abstract The influence of electric current pulse (ECP) with parallel electrodes on the solidification structure of Pure Aluminum has been investigated. The experimental results indicate that the solidification structure cannot be refined when the ECP is applied before the molten metal starts nucleating. However, significant refinement of the solidification structure can be achieved by applying ECP during the nucleation stage. In addition, under the same cooling conditions, ECP with parallel electrodes has better refinement effect than ECP with up–down electrodes. The refinement mechanism of ECP with parallel electrodes has also been proposed.
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refining mechanism of the electric current pulse on the solidification structure of Pure Aluminum
Acta Materialia, 2007Co-Authors: Qijie Zhai, Xiliang Liao, Jun Luo, Wenjie Chen, Yongyong GongAbstract:The refining mechanism of the electric current pulse (ECP) on the solidification structure of Pure Aluminum is systematically investigated by properly designed experiments. The experiment results show that the solidification structure cannot be refined by exerting an ECP on the high temperature liquid phase, indicating that the ECP has no inoculation effect on the liquid metal. The ECP has also no obvious influence on the solidification structure when it is applied during crystal growth, showing that the ECP cannot cause melting or break off the growing crystal. However, the very fine macrostructure is obtained by applying an ECP during the nucleation of the melt. The reason is that the ECP makes the crystal nuclei formed on the wall of the mould fall off and move freely in the molten metal, promoting the multiplication of crystal nuclei.
Murat Aksoy - One of the best experts on this subject based on the ideXlab platform.
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investigation on diffusion bonding characteristics of Aluminum metal matrix composites al sicp with Pure Aluminum for different heat treatments
Journal of Materials Processing Technology, 2006Co-Authors: M Muratoglu, Okkes Yilmaz, Murat AksoyAbstract:Abstract Joining characteristic of SiC particulate reinforced Aluminum metal matrix composites (MMCs) with Pure Aluminum were investigated by diffusion bonding process. The joining quality of the Al/SiCp MMCs was studied to determine the influences of SiCp particulates with homogenization and age hardening on bonding properties. The experimental results indicate that the application of aging before and after diffusion bonding decreases SiC particulate accumulation, and increases other elemental concentration at interface. Especially, the application of aging treatment before the diffusion bonding of Al/SiCp MMCs to Pure Al, increased Cu% concentration at interface which treats as the insert alloy.
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investigation on diffusion bonding characteristics of Aluminum metal matrix composites al sicp with Pure Aluminum for different heat treatments
Journal of Materials Processing Technology, 2006Co-Authors: M Muratoglu, Okkes Yilmaz, Murat AksoyAbstract:Abstract Joining characteristic of SiC particulate reinforced Aluminum metal matrix composites (MMCs) with Pure Aluminum were investigated by diffusion bonding process. The joining quality of the Al/SiCp MMCs was studied to determine the influences of SiCp particulates with homogenization and age hardening on bonding properties. The experimental results indicate that the application of aging before and after diffusion bonding decreases SiC particulate accumulation, and increases other elemental concentration at interface. Especially, the application of aging treatment before the diffusion bonding of Al/SiCp MMCs to Pure Al, increased Cu% concentration at interface which treats as the insert alloy.
Zuoyong Dou - One of the best experts on this subject based on the ideXlab platform.
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high strain rate compression of cenosphere Pure Aluminum syntactic foams
Scripta Materialia, 2007Co-Authors: Zuoyong Dou, Longtao Jiang, Qiang Zhang, Z Y Xiu, Guoqin ChenAbstract:The high strain rate compression behavior of cenosphere–Pure Aluminum syntactic foams has been studied by comparing it with the results from the quasi-static loading condition. The foams exhibited distinct strain rate sensitivity and the peak strengths increased from ∼45–75 to ∼65–120 MPa; the energy absorption capacity also increased by ∼50–70%. A three-parameter data-fitting equation has been developed to predict the rate-dependent compressive stress at relatively low strains for the syntactic foams.
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compression behaviors of cenosphere Pure Aluminum syntactic foams
Scripta Materialia, 2007Co-Authors: Zuoyong Dou, Longtao Jiang, D L Sun, B S DingAbstract:A new method has been established to predict the compressive strength of cenosphere–Aluminum syntactic foams, showing the relation between the relative wall thickness of the cenopshere and the compressive strength of such foams. Quasi-static compression tests indicated that annealed cenosphere–Aluminum syntactic foams can deform plastically at a relatively higher stress (∼45–75 MPa) and their energy-absorbing capacity can reach ∼20–35 MJ m−3. The deformation mechanisms of syntactic foams have also been discussed.
