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International Journal of Minerals,Metallurgy and Materials 2012年第10期19卷 951-956页

作者： Amir Hossein Yaghtin Erfan Salahinejad Ali Khosravifard Department of Materials Science and Engineering(Shiraz Branch) Islamic Azad UniversityShiraz 71955Iran Department of Materials Science and Engineering School of EngineeringShiraz UniversityShiraz ***Iran

Particulate reinforced metallic matrix composites have attracted considerable attention due to their lightweight, high strength, high specific modulus, and good wear resistance. A1/B4C composite strips were produced in this work by a modified accumulative roll bonding process where the strips were rotated 90° around the normal direction between successive passes. Transmission electron microscopy and X-ray diffraction analyses reveal the development of nanostructures in the Al matrix after seven passes. It is found that the B4C reinforcement distribution in the matrix is improved by progression of the process. Additionally, the tensile yield strength and elongation of the processed materials are increased with the increase of passes.

关键词： metallic matrix composites particle reinforced composites nanostructures aluminum boron carbide roll bonding tensile properties

Thermodynamic property of sandwich cylindrical shell structure with metallic wire mesh:Numerical modeling and experimental analysis

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Chinese Journal of Aeronautics 2024年第1期37卷 138-152页

作者： Xin XUE Guojian SHEN Juan LIAO Institute of Metal Rubber&Vibration Noise School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou 350116China Fujian Shuikou Power Generation Group Co. LTDFuzhou 350000China

As a new addition to lightweight composite structures,the sandwich cylindrical shell with a metallic wire mesh core has emerged as a promising solution for thermodynamic performance analysis at elevated *** intricate interwoven cellular formations within the metallic wire mesh pose difficulties for thermo-mechanical modeling and property ***,the constitutive models employed to characterize hysteresis phenomena were presented,comprising isotropic elasticity,Bergstrom-Boyce model,Ogden hyper-elasticity,and parameter identification through mechanical examinations at varying ***,the finite element modeling of cylindrical shell structures was determined for modal and steady-state dynamic ***,the experimental procedures were carried out,including the preparation of the sandwich cylindrical shell and the dynamic testing *** first-order natural frequency of the cylindrical shell structure is close to the resonance frequency of the dynamic test results,with a maximum error of 6.5%,demonstrating the accuracy of the simulation *** compared to the solid-core cylindrical shell,the average insertion loss of the sandwich cylindrical shell structure within the frequency range of 10–1000 Hz at room temperature is up to 11.09 ***,at elevated temperatures,the average insertion loss of the sandwich cylindrical shell decreases but fluctuates as the temperature changes.

关键词： Energy dissipation metallic matrix composites Numerical analysis Sandwich structure Thermodynamic properties

Role of Edge and Screw Dislocations in Composite System on the Plastic Deformation of Metals

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Journal of Materials Science & Technology 1996年第1期12卷 69-71页

作者： Jiang, J Lung, CW International Centre for Materials Physics Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The present paper has studied the effects of dislocation density on the role of edge and screw dislocations and described further the parallel feature of the edge and screw dislocations and their role on the plastic d... 详细信息

关键词： metallic matrix composites

Creep Behavior of Mullite Short Fiber Reinforced ZL109 Alloy composites at High Temperature

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Journal of Materials Science & Technology 2001年第4期17卷 429-432页

作者： ShanlingWANG BaoluoSHEN ShensiGAO DaLI MingjingTU WeichengYU GeYAO DepartmentofmetallicMaterials SichuanUniversityChengdu610065China StateKeyLaboratoryforFatigueandFractureofMaterials InstituteofMetalResearchChineseAcademyofSciencesShenyang110016China

The creep behavior of Al2O3×SiO2 fiber reinforced ZL109 composites has been investigated at four temperatures ranging from 553 to 623 K. The results show high stress exponent and high apparent creep activation energy. A good correlation between the normalized creep rate and the normalized effective stress means that the true stress exponent of the minimum creep strain rate of the composite is very close to 5, and the minimum creep strain rate is the matrix lattice diffusion controlled. The threshold stress decreases linearly with the temperature increase and disappears at a temperature close to 623 K. It is assumed that the long range internal back stresses generated in creep reduce the load transfer to fibers, and the interaction between dislocations and strengthening precipitates decreases at high temperature. At a high temperature where the long range internal back stress is very close to the applied stress, the threshold stress disappears.

关键词： metallic matrix composites

Selective interfacial bonding and thermal conductivity of diamond/Cu-alloy composites prepared by HPHT technique

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International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 364-371页

作者： Hui Chen Cheng-chang Jia Shang-jie Li Xian Jia Xia Yang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Shenzhen Haimingrun Industrial Co. Ltd. Shenzhen 518126 China

Cu-based and Cu-alloy-based diamond composites were made by high-pressure-high-temperature （HPHT） sintering with the aim of maximizing the thermal conductivity of the composites. Improvements in interfacial bonding strength and thermo-physical properties of the composites were achieved using an atomized copper alloy with minor additions of Co, Cr, 13, and Ti. The thermal conductivity （TC） oh- mined exhibited as high as 688 W.m-1.K-1, but also as low as 325 W.m-1.K-l. A large variation in TC can be rationalized by the discrepancy of diamond-matrix interfacial bonding. It was found from fractography that preferential bonding between diamond and the Cu-alloy matrix occurred only on the diamond {100} faces. EDS analysis and Raman spectra suggested that selective interfacial bonding may be attributed to amorphous carbon increasing the wettability between diamond and the Cu-alloy matrix. Amorphous carbon was found to significantly affect the TC of the composite by interface modification.

关键词： metallic matrix composites diamonds copper alloys interfacial bonding thermal conductivity

Fabrication,microstructures,and properties of copper matrix composites reinforced by molybdenum-coated carbon nanotubes

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Rare Metals 2011年第4期30卷 401-407页

作者： NIE Junhui JIA Chengchang JIA Xian ZHANG Yafeng SHI Na LI Yi School of Matertals Sctence and Engmeermg Umverszty of Sctence and Technology Beijing Beijing 100083 China China Iron ＆ Steel Research Institute Group Beijing 100081 China

Multiwalled carbon nanotubes （CNTs） were coated by a molybdenum layer using carbonyl thermal decomposition process with a precursor of molybdenum hexacarbonyl. The Mo-coated CNTs （Mo-CNTs） were added into copper powders to fabricate Mo-CNT/Cu composites by means of mechanical milling followed by spark plasma sintering. The Mo-CNTs were uniform dispersion in the Cu matrix when their contents were 2.5 vo1.%-7.5 vol.%, while some Mo-CNT clusters were clearly observed at additions of 10.0 vo1.%-15.0 vol.% Mo-CNTs in the mixture. The mechanical, electrical, and thermal properties of the Mo-CNT/Cu composites were characterized, and the results showed that the tensile strength and hardness were 2.0 and 2.2 times higher than those of CNT-free specimens, respectively. Moreover, the Mo-CNT/Cu composites exhibited an enhanced thermal conductivity but inferior electrical conductivity compared with sintered pure Cu. The uncoated CNT/Cu composites were fabricated by the similar processes, and the measured tensile strength, hardness, thermal conductivity, and electrical conductivity of the CNT/Cu composites were lower than those of the Mo-CNT/Cu composites.

关键词： metallic matrix composites mechanical properties ball milling molybdenum carbon nanotubes

Thermal conductivity of diamond/copper composites with a bimodal distribution of diamond particle sizes prepared by pressure infiltration method

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Rare Metals 2011年第4期30卷 408-413页

作者： CHEN Chao GUO Hong CHU Ke YIN Fazhang ZHANG Ximing HAN Yuanyuan FAN Yeming The General Research Institute of Nonferrous Metals Beijing Beijing 100088 China

The thermal conductivity of diamond/copper composites with bimodal particle sizes was studied. The composites were prepared through pressure infiltration of liquid copper into diamond preforms with a mixture of 40 and 100 pm-size diamonds. The permeability of the preforms with different coarse-to-fine volume ratios of diamonds was investigated. The thermal conductivity of the diamond/copper composites with bimodal size distribution was compared to the theoretical value derived from an analytical model developed by Chu. It is predicted that the diamond/copper composites could reach a higher thermal conductivity and their surface roughness could be improved by applying bimodal diamond particle sizes.

关键词： metallic matrix composites thermal conductivity diamonds copper size distribution pressure infiltration

Copper matrix composites Reinforced with Nanometer Alumina Particle

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Journal of Materials Science & Technology 1999年第2期15卷 143-146页

作者： Wu, JJ Li, GB Zhang, Y Jiang, ZX Lei, TQ Hebei Univ Technol Dept Mat Sci & Engn Tianjing 300130 Peoples R China Harbin Inst Technol Harbin 150006 Peoples R China

The microstructure and properties of the oxide particle dispersion strengthened composite fabricated by internal oxidation method have been studied. Using nitrogen base atmosphere and a new process flow we can improve the quality of the MMCs and decrease the cost of the composites. The size of alumina is in the nanometer order of magnitude and the particles are well distributed. Under the condition of having good electrical conductivity, the composites have 1 to 2 times higher mechanical properties than those of pure Cu.

关键词： metallic matrix composites

Interface Characterization of the SiCp/Al composites Made by Powder Metallurgy

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Journal of Materials Science & Technology 1999年第2期15卷 147-150页

作者： Fan, JZ Zhang, K Shi, LK Zhang, SM Gen Res Inst NonFerrous Met Beijing 100088 Peoples R China

The interface of the SiCp/Al composites produced by powder metallurgy processing involving hot-pressing above the matrix solidus temperature has been investigated by means of TEM. Several kinds of interfaces between the reinforcements and the matrix in the composite, including the clean interfaces, the faceted interfaces and the slight reaction interfaces, are presented. And most of interfaces belong to the slight reaction interfaces which are composed of the Al with different orientation from the Al matrix near the interface zone and particle-like substances produced by MgAl2O4 spinels and impurities.

关键词： metallic matrix composites

Fabrication and densification enhancement of SiC-particulate-reinforced copper matrix composites prepared via the sinter-forging process

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International Journal of Minerals,Metallurgy and Materials 2014年第9期21卷 934-939页

作者： Mohammadmehdi Shabani Mohammad Hossein Paydar Mohammad Mohsen Moshksar Department of Materials Science and Engineering School of Engineering Shiraz University

The fabrication of copper （Cu） and copper matrix silicon carbide （Cu/SiCp） particulate composites via the sinter-forging process was investigated. Sintering and sinter-forging processes were performed under an inert Ar atmosphere. The influence of sinter-forging time, temperature, and compressive stress on the relative density and hardness of the prepared samples was systematically investigated and subsequently compared with that of the samples prepared by the conventional sintering process. The relative density and hardness of the composites were enhanced when they were prepared by the sinter-forging process. The relative density values of all Cu/SiCp composite samples were observed to decrease with the increase in SiC content.

关键词： metallic matrix composites particle reinforced composites silicon carbide forging sintering bulk density