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Microstructures and mechanical properties of extruded 2024 aluminum alloy reinforced by FeNiCrCoAl_3 particles 被引量:7
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作者 王志伟 原燕波 +2 位作者 郑瑞晓 Kei AMEYAMA 马朝利 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2366-2373,共8页
Different proportions of commercial 2024 aluminum alloy powder and FeNiCrCoA13 high entropy alloy (HEA) powder were ball-milled (BM) for different time. The powder was consolidated by hot extrusion method. The mic... Different proportions of commercial 2024 aluminum alloy powder and FeNiCrCoA13 high entropy alloy (HEA) powder were ball-milled (BM) for different time. The powder was consolidated by hot extrusion method. The microstructures of the milled powder and bulk alloy were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Mechanical properties of the extruded alloy were examined by mechanical testing machine. The results show that after BM, the particle size and microstructures of the mixed alloy powder change obviously. After 48 h BM, the average size of mixed powder is about 30 nm, and then after hot extrusion, the average size of grains reaches about 70 rim. The compressive strength of the extruded alloy reaches 710 MPa under certain conditions of milling time and composition. As a result of the identification of the nano-/micro-strueture-property relationship of the samples, such high strength is attributed mainly to the nanocrystalline grains of a(Al) and nanoscaled FeNiCrCoAl3 particles, and the fine secondary phase of Al2Cu and Fe-rich phases. 展开更多
关键词 aluminium alloys FeNiCrCoAl3 reinforced particles high entropy alloy ball milling hot extrusion nano-precipitates
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Fabrication and Mechanical Properties of 2024 Aluminum Alloy Reinforced by FeNiCrCoAl_3 High Entropy Particles 被引量:2
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作者 Zhi-Wei Wang Rui-Xiao Zheng +2 位作者 Chao-Li Ma Li-Rong Hao Yang Han 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2013年第5期119-122,共4页
This article mainly discussed bulk material lHvl^ared by powder metallurgy, and the commercial 2024 aluminum alloy powder and FeNiCrCoA13 high entropy alloy powder (both produced by argon gas atomization process) we... This article mainly discussed bulk material lHvl^ared by powder metallurgy, and the commercial 2024 aluminum alloy powder and FeNiCrCoA13 high entropy alloy powder (both produced by argon gas atomization process) were ball-milled for different hours. The prepared powder was consolidated by hot extrusion method. The microstruetures of the milled powder and bulk alloy were examined by X - Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The thermal stability was tested by differential scanning calorimetry (DSC). Mechanical properties of the extruded alloy were examined by Vickers hardness tester and mechanical testing machine. The results show that after milling, the mixed particle sizes and microstructures of the alloy powder change obviously. The compressive strength of the extruded alloy has reached 580 MPa under certain conditions of milling time and composition. 展开更多
关键词 aluminum alloy nanocrystaUine FeNiCrCoA13 high entroy reinforced particle ball milling(BM) the extruded alloy
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Effects of TaN nanoparticles on microstructure,mechanical properties and tribological performance of PEEK coating prepared by electrophoretic deposition 被引量:1
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作者 Lin CAO Peng ZHANG +7 位作者 Shuang-jian LI Qi-wei WANG Da-hai ZENG Chuan-yong YU Qing-yang LI Yu-wen LIAO Zhi-dan LIN Wei LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第10期3334-3348,共15页
In order to solve the friction,wear and lubrication problems of titanium,a series of TaN/ployether−ether−ketone(PEEK)coatings were developed by electrophoretic deposition,and the effects of TaN nanoparticles on the mi... In order to solve the friction,wear and lubrication problems of titanium,a series of TaN/ployether−ether−ketone(PEEK)coatings were developed by electrophoretic deposition,and the effects of TaN nanoparticles on the microstructure,mechanical properties and tribological performance of coatings were explored.Results manifest that the introduction of TaN nanoparticles into PEEK coatings could improve the deposition efficiency,enhance the resistant deform capacity,increase the hardness,elastic modulus and adhesive bonding strength.Compared with the pure PEEK coating,the friction coefficient of P-TN-3 was greatly reduced by 31.25%.The wear resistance of P-TN-3 was also improved in huge boost,and its specific wear rate was decreased from 9.42×10^(−5) to 1.62×10^(−5) mm^(3)·N^(−1)·m^(−1).The homogeneous composite TaN/PEEK coatings prepared by electrophoretic deposition were well-adhered to the titanium alloy substrate,TaN nanoparticles could improve the strength of PEEK coating,and provide wear-resistance protection for titanium alloys. 展开更多
关键词 ployether−ether−ketone coating tantalum nitride particle reinforcement MICROSTRUCTURE mechanical properties BIOTRIBOLOGY
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Effective Elastic Properties of 3-Phase Particle Reinforced Composites with Randomly Dispersed Elastic Spherical Particles of Different Sizes Dedicated to Professor Karl Stark Pister for his 95th birthday 被引量:1
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作者 Yu-Fu Ko Jiann-Wen Woody Ju 《Computer Modeling in Engineering & Sciences》 SCIE EI 2021年第12期1305-1328,共24页
Higher-order multiscale structures are proposed to predict the effective elastic properties of 3-phase particle reinforced composites by considering the probabilistic spherical particles spatial distribution,the parti... Higher-order multiscale structures are proposed to predict the effective elastic properties of 3-phase particle reinforced composites by considering the probabilistic spherical particles spatial distribution,the particle interactions,and utilizing homogenization with ensemble volume average approach.The matrix material,spherical particles with radius a1,and spherical particles with radius a2,are denoted as the 0th phase,the 1st phase,and the 2nd phase,respectively.Particularly,the two inhomogeneity phases are different particle sizes and the same elastic material properties.Improved higher-order(in ratio of spherical particle sizes to the distance between the centers of spherical particles)bounds on effective elastic properties of 3-phase particle reinforced proposed Formulation II and Formulation I derive composites.As a special case,i.e.,particle size of the 1st phase is the same as that of the 2nd phase,the proposed formulations reduce to 2-phase formulas.Our theoretical predictions demonstrate excellent agreement with selected experimental data.In addition,several numerical examples are presented to demonstrate the competence of the proposed frameworks. 展开更多
关键词 Particle reinforced composites MICROMECHANICS spherical particle interactions ensemble volume average HOMOGENIZATION probabilistic spatial distribution higher-order bounds multiscale
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Laser cladding in-situ carbide particle reinforced Fe-based composite coatings with rare earth oxide addition 被引量:21
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作者 吴朝锋 马明星 +3 位作者 刘文今 钟敏霖 张红军 张伟明 《Journal of Rare Earths》 SCIE EI CAS CSCD 2009年第6期997-1002,共6页
Particulate reinforced metal matrix composite(PR-MMC) has excellent properties such as good wear resistance,corrosion resistance and high temperature properties.Laser cladding is usually used to form PR-MMC on metal s... Particulate reinforced metal matrix composite(PR-MMC) has excellent properties such as good wear resistance,corrosion resistance and high temperature properties.Laser cladding is usually used to form PR-MMC on metal surface with various volume fractions of ceramic particles.Recent literatures showed that laser melting of powder mixture containing carbon and carbide-forming elements,was favorable for the formation of in-situ synthesized carbide particles.In this paper,rare earth oxide(RE2O3) was added into t... 展开更多
关键词 laser cladding particle reinforced rare earth oxide nucleation rare earth carbide
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Effect of sintering parameters on the microstructure and thermal conductivity of diamond/Cu composites prepared by high pressure and high temperature infiltration 被引量:6
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作者 Hui Chen Cheng-chang Jia Shang-jie Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2013年第2期180-186,共7页
Pure Cu composites reinforced with diamond particles were fabricated by a high pressure and high temperature (HPHT) infiltration technique. Their microstructural evolution and thermal conductivity were presented as ... Pure Cu composites reinforced with diamond particles were fabricated by a high pressure and high temperature (HPHT) infiltration technique. Their microstructural evolution and thermal conductivity were presented as a function of sintering parameters (temperature, pressure, and time). The improvement in interfacial bonding strength and the maximum thermM conductivity of 750 W/(m.K) were achieved at the optimal sintering parameters of 1200℃, 6 GPa and 10 min. It is found that the thermal conductivity of the composites depends strongly on sintering pressure. When the sintering pressure is above 6 GPa, the diamond skeleton is detected, which greatly contributes to the excellent thermal conductivity. 展开更多
关键词 metallic matrix composites particle reinforced composites COPPER diamonds INFILTRATION microstructuralevolution thermal conductivity
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Influence of Ta on Microstructure and Abrasive Wear Resistance of Laser Clad NiCrSiB Coating 被引量:3
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作者 余廷 DENG Qilin +1 位作者 DONG Gang YANG Jianguo 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第3期437-443,共7页
A mixture of NiCrSiB alloy powder and tantalum (Ta) powder was used as laser clad material to improve abrasive wear resistance of the Ni-based coating. The microstructure and wear resistance of the coating were inve... A mixture of NiCrSiB alloy powder and tantalum (Ta) powder was used as laser clad material to improve abrasive wear resistance of the Ni-based coating. The microstructure and wear resistance of the coating were investigated. Addition of Ta element works to suppress the growth of coarse M7C3 carbide in the coating, resulting in a decrease in aspect ratio of coarse carbide. In the abrasive wear test, in situ synthesized TaC particles well bond with Ni-based matrix, and are hardly pull out from wear surface. Grooves on the worn surface of NiCrSiB coating are much deeper and sharper than those in the NiCrSiB+Ta composite coating. Also, a weight loss of the composite coating is much lower than that of the NiCrSiB coating. The wear resistance of the laser clad Ni-based coating is enhanced to a much greater extent through the addition of Ta. This is attributed to the in situ synthesized hard TaC particles of nearly equiaxed shape, the Ni-based matrix strengthened by Ta and the decrease in aspect ratio of the coarse brittle carbides. 展开更多
关键词 laser cladding Ni-based alloy wear resistance TANTALUM TAC particle reinforcement
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Processing of nanostructured metallic matrix composites by a modified accumulative roll bonding method with structural and mechanical considerations 被引量:3
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作者 Amir Hossein Yaghtin Erfan Salahinejad Ali Khosravifard 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第10期951-956,共6页
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 i... 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. 展开更多
关键词 metallic matrix composites particle reinforced composites NANOSTRUCTURES ALUMINUM boron carbide roll bonding tensile properties
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Microstructure of in situ Al_3Ti/6351Al composites fabricated with electromagnetic stirring and fluxes 被引量:5
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作者 李桂荣 王宏明 +3 位作者 赵玉涛 陈登斌 陈刚 程晓农 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第4期577-583,共7页
The 6351 wrought aluminum alloy and K2TiF6-CaF2-LiCl components were selected as raw materials to fabricate in situ Al3Ti particulate reinforced aluminum alloy at 720℃via direct melt reaction method with electromagne... The 6351 wrought aluminum alloy and K2TiF6-CaF2-LiCl components were selected as raw materials to fabricate in situ Al3Ti particulate reinforced aluminum alloy at 720℃via direct melt reaction method with electromagnetic stirring(EMS).CaF2 and LiCl acted as fluxes to lower the reaction temperature of the system.It is shown that the electromagnetic stirring and fluxes accelerate the emulsion process of K2TiF6.Optical microscopy,scanning electron microscopy,transmission electron microscopy and energy dispersive spectrum were utilized to analyze the microstructure and components of composites.Compared to composites fabricated without EMS and fluxes,the sizes of endogenetic Al3Ti are refined from 10-15μm to 2-4μm,which are often accompanied with silicon element.The morphology of Al3Ti or Al3TiSi0.22 exhibits triangle,quadrilateral and other clumpy patterns. Because of the Ca elements from CaF2,the sizes of Mg2Si decrease from 8-10μm to 1-2μm due to the formation of Ca2Si. 展开更多
关键词 6351 AI alloy MICROSTRUCTURE in situ particle reinforced aluminum composites electromagnetic stirring FLUXES
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Solid fraction evolution characteristics of semi-solid A356 alloy and in-situ A356–TiB_2 composites investigated by differential thermal analysis 被引量:2
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作者 S.Deepak Kumar A.Mandal M.Chakraborty 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第4期389-394,共6页
The key factor in semi-solid metal processing is the solid fraction at the forming temperature because it affects the microstructure and mechanical properties of the thixoformed components. Though an enormous amount o... The key factor in semi-solid metal processing is the solid fraction at the forming temperature because it affects the microstructure and mechanical properties of the thixoformed components. Though an enormous amount of data exists on the solid fraction-temperature re- lationship in A356 alloy, information regarding the solid fraction evolution characteristics of A356-TiB2 composites is scarce. The present article establishes the temperature-solid fraction correlation in A356 alloy and A356-xTiB2 (x = 2.5wt% and 5wt%) composites using dif- ferential thermal analysis (DTA). The DTA results indicate that the solidification characteristics of the composites exhibited a variation of 2℃ and 3℃ in liquidus temperatures and a variation of 3℃ and 5℃ in solidus temperatures with respect to the base alloy. Moreover, the eutectic growth temperature and the solid fraction(fs) vs. temperature characteristics of the composites were found to be higher than those of the base alloy. The investigation revealed that in-situ formed TiB2 particles in the molten metal introduced more nucleation sites and reduced undercooling. 展开更多
关键词 particle reinforced composites aluminum alloys titanium boride CASTING solid fraction differential thermal analysis
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STUDY ON DIFFUSION WELDING OF ALUMINIUN MATRIX COMPOSITE 被引量:4
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作者 J. T. Niu L. M. Liu +2 位作者 J. P. Zhai J. Yu X. M. Zhang (National Key Laboratory of Advanced Welding Production Technology, HIT, Harbin 750001, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第1期12-17,共6页
Effects of diffusion welding parameters on strength of welded joint based on particle reinforced alumini- um matrix composite Al2O3p/6061Al were studied by comparing with aluminium matrix alloy,Mecha- nism for ... Effects of diffusion welding parameters on strength of welded joint based on particle reinforced alumini- um matrix composite Al2O3p/6061Al were studied by comparing with aluminium matrix alloy,Mecha- nism for the loss of joint strength was analyzed.It was pointed out that the key processing parameters affecting the strength of joint was the welding temperature.The high quality joint can be successfully obtained with appropriate diffusion welding parameters. 展开更多
关键词 particle reinforced aluminium matrix composite diffusion welding oxide film
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Study on dry friction and wear resistance of a WC-Co particle reinforced iron matrix composite material 被引量:2
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作者 Zhang Peng Zeng Shaolian +1 位作者 Zhang Zhiguo Li Wei 《China Foundry》 SCIE CAS 2013年第3期135-140,共6页
In order to select a suitable material for the rolling mill guide application, the dry sliding friction and wear resistance of a tungsten carbide combining cobalt (WC-Co) particle reinforced chromium cast iron composi... In order to select a suitable material for the rolling mill guide application, the dry sliding friction and wear resistance of a tungsten carbide combining cobalt (WC-Co) particle reinforced chromium cast iron composite material were studied. In particular, the wear resistance was discussed in detail. The results showed that the composite material demonstrates 25 times the wear resistance of high Cr cast iron, and 9 times the wear resistance of heat resistant steel. However, the average friction factor in the stable friction stage showed a relationship of μComposites/45#steel>μHigh chromium cast iron/45#steel>μHeat resistant steel/45 # steel. The wear resistance mechanism of the composite material was associated with the reinforcing particles, which protruded from the worn surface to bear the friction load when the matrix material surface was worn, thereby reducing the abrasive and adhesive wear. In addition, the matrix material possessed suitable hardness and toughness, providing a support to the reinforcements. 展开更多
关键词 particle reinforcement composite material high Cr cast iron friction and wear
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AN ANALYSIS OF THE MODELING OF STRESS AND STRAIN FIELDS IN A REAL MICROSTRUC-TURE USING AHYBRID METHOD 被引量:2
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作者 E.Soppa S.Schmauder 《Acta Mechanica Solida Sinica》 SCIE EI 2002年第3期277-282,共6页
The distribution of stress and strain fields in a micro-structuralarea of a particle reinforced composite is studied by a combinationof experimental and numerical method (hybrid method). With the ex-perimental values ... The distribution of stress and strain fields in a micro-structuralarea of a particle reinforced composite is studied by a combinationof experimental and numerical method (hybrid method). With the ex-perimental values of displacements in a micro-region as the boundaryloading condition, strain and stress fields inside the micro-regionare calculated by the finite element method under tow different kindsof model- ing, namely, as pale stress and plane strain condition. Thedifferences between the two kinds of modeling conditions as appliedto micro-structural areas are discussed. 展开更多
关键词 particle reinforced composite real microstructure hybrid method deformation and yield- ing
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Fabrication and densification enhancement of SiC-particulate-reinforced copper matrix composites prepared via the sinter-forging process 被引量:1
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作者 Mohammadmehdi Shabani Mohammad Hossein Paydar Mohammad Mohsen Moshksar 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第9期934-939,共6页
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 ine... 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. 展开更多
关键词 metallic matrix composites particle reinforced composites silicon carbide FORGING SINTERING bulk density
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Synergistic regulation of current-carrying wear performance of resin matrix carbon brush composites with tungsten copper composite powder 被引量:1
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作者 TU Chuan-jun GONG Pei +4 位作者 REN Gai-mei CHEN Gang CHEN Jian HONG Li-rui LIU Ping 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第10期2973-2987,共15页
Resin matrix carbon brush composites(RMCBCs)are critical materials for high-powered electric tools.However,effectively improving their wear resistance and heat dissipation remains a challenge.RMCBCs prepared with flak... Resin matrix carbon brush composites(RMCBCs)are critical materials for high-powered electric tools.However,effectively improving their wear resistance and heat dissipation remains a challenge.RMCBCs prepared with flake graphite powders that were evenly loaded with tungsten copper composite powder(RMCBCs-W@Cu)exhibited a low wear rate of 1.63 mm^(3)/h,exhibiting 48.6%reduction in the wear rate relative to RCMBCs without additives(RMCBCs-0).In addition,RMCBCs-W@Cu achieved a low friction coefficient of 0.243 and low electric spark grade.These findings indicate that tungsten copper composite powders provide particle reinforcement and generate a gradation effect for the epoxy resin(i.e.,connecting phase)in RMCBCs,which weakens the wear of RMCBCs caused by fatigue under a cyclic current-carrying wear. 展开更多
关键词 resin matrix carbon brush composite tungsten copper composite powder current-carrying wear particle reinforcement
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Influence of filler materials on microstructure and mechanical properties of MGH956 alloy in TIG welding
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作者 雷玉成 赵凯 +1 位作者 朱强 黄巍 《China Welding》 EI CAS 2012年第4期59-64,共6页
In order to improve the mechanical properties of MGH956 alloy fusion weZding joint, two kinds of self-made materials were used as filler materials to MGH956 alloy for TIG welding respectively. Microstracture and tensi... In order to improve the mechanical properties of MGH956 alloy fusion weZding joint, two kinds of self-made materials were used as filler materials to MGH956 alloy for TIG welding respectively. Microstracture and tensile fracture of joints were researched by scanning electron microscope(SEM). Reinforced particles were researched by SEM, X-ray diffraction ( XRD ) and energy dispersive X-ray spectrometry (EDS). These results were compared with joint which is filled with base materials. The results show that new reinforced phases such as TiC, TiN, Ni3Al and A1Ni are produced in the weld metal zone with two kinds of self-made materials as filler materials. The size of these reinforcements is about 1 μm, and the distribution of particles is very uniform in the matrix. The number of pores is reduced. Agglomerate Al-Y-O composite oxides are correspondingly decreased compared to the joint filled with base material. Thus, welded joint perormanee is enhanced. The average room temperature tensile strength of joints are 581 MPa and 607 MPa respectively. The fracture of joints both in general exhibit brittle fracture. 展开更多
关键词 MGH956 alloy TIG welding MICROSTRUCTURE metallurgy mechanism reinforce particles mechanical properties
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Effects of sintering temperature on the microstructural evolution and wear behavior of WCp reinforced Ni-based coatings
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作者 Chuan-hui Chen Yang Bai Xu-chu Ye 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第12期1254-1262,共9页
This article focuses on the microstructural evolution and wear behavior of 50wt%WC reinforced Ni-based composites prepared onto 304 stainless steel substrates by vacuum sintering at different sintering temperatures. T... This article focuses on the microstructural evolution and wear behavior of 50wt%WC reinforced Ni-based composites prepared onto 304 stainless steel substrates by vacuum sintering at different sintering temperatures. The microstructure and chemical composition of the coatings were investigated by X-ray diffraction (XRD), differential thermal analysis (DTA), scanning and transmission electron microscopy (SEM and TEM) equipped with energy-dispersive X-ray spectroscopy (EDS). The wear resistance of the coatings was tested by thrust washer testing. The mechanisms of the decomposition, dissolution, and precipitation of primary carbides, and their influences on the wear resistance have been discussed. The results indicate that the coating sintered at 1175℃ is composed of fine WC particles, coarse M6C (M=Ni, Fe, Co, etc.) carbides, and discrete borides dispersed in solid solution. Upon increasing the sintering temperature to 1225℃, the microstructure reveals few incompletely dissolved WC particles trapped in larger M6C, Cr-rich lamellar M23C6, and M3C2 in the austenite matrix. M23C6 and M3C2 precipitates are formed in both the γ/M6C grain boundary and the matrix. These large-sized and lamellar brittle phases tend to weaken the wear resistance of the composite coatings. The wear behavior is controlled simultaneously by both abrasive wear and adhesive wear. Among them, abrasive wear plays a major role in the wear process of the coating sintered at 1175℃, while the effect of adhesive wear is predominant in the coating sintered at 1225℃. 展开更多
关键词 particle reinforced composites composite coatings tungsten carbide microstructural evolution wear behavior sintering temperature
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Study on Diffusion Welding Parameters of Particle reinforced Aluminium Matrix Composite Al_2O_(3p) /6061Al
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作者 刘黎明 牛济泰 韩立红 《Rare Metals》 SCIE EI CAS CSCD 1999年第4期299-304,共6页
Effects of diffusion welding process parameters on strength of welded joint based on particle reinforced aluminium matrix composite Al 2O 3p /6061Al have been studied through comparing with aluminium matrix allo... Effects of diffusion welding process parameters on strength of welded joint based on particle reinforced aluminium matrix composite Al 2O 3p /6061Al have been studied through comparing with aluminium matrix alloy. The mechanism for loss of joint strength has been analyzed. It should be pointed out that key processing parameters affecting the strength of joint was welding temperature. The high quality joint can be successfully obtained with appropriate diffusion welding parameters. 展开更多
关键词 Particle reinforced aluminium matrix composite Diffusion welding Oxide film
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Hypereutectic Al-Si Matrix Composites Prepared by In Situ Fe_(2)O_(3)/Al System
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作者 WANG Yifei ZHANG Jing +5 位作者 SUN Chichi CHENG Zhaoxia PANG Zhouyi WANG Ling CHEN Hongmei LIU Ning 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2021年第5期636-643,共8页
Al_(2)O_(3) particles reinforced hypereutectic Al-Si composites were prepared by in situ Fe_(2)O_(3)/Al reaction system.The thermodynamic analysis and microstructure evolution were investigated by differential scannin... Al_(2)O_(3) particles reinforced hypereutectic Al-Si composites were prepared by in situ Fe_(2)O_(3)/Al reaction system.The thermodynamic analysis and microstructure evolution were investigated by differential scanning calorimetry,optical microscope,scanning electronic microscopy and transmission electron microscope.Results show that the reaction between Fe_(2)O_(3) and Al is spontaneous which can be separated into two steps at different temperatures.The in situ Al_(2)O_(3) particles in nano size distribute on the Al matrix accompanied with long needle-shapedβFe-rich intermetallic phase.With different content of Mn addition,βphase can be modified toα-Al15(Mn,Fe)3Si2 andδ-Al4(Fe,Mn)Si2.Both tensile strength and elongation results at room temperature and 300℃reveal that the optimal Fe-rich intermetallic phase is finer Chinese-script and polyhedralαphase with a Mn/Fe mass ratio 0.5 for the composites.Both in situ Al_(2)O_(3) particles andα-Fe phases contribute to the properties improvement of the composites。 展开更多
关键词 hypereutectic Al-Si alloys particles reinforced composites Al_(2)O_(3)particles Fe-rich intermetallic compounds
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THEORETICAL ANALYSIS ON THE LOCAL CRITICAL STRESS AND SIZE EFFECT FOR INTERFACIAL DEBONDING IN PARTICLE REINFORCED RHEOLOGICAL MATERIALS
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作者 Chen Jiankang Huang Zhuping Bai Shulin 《Acta Mechanica Solida Sinica》 SCIE EI 1999年第1期1-8,共8页
The mechanisms of interfacial debonding of particle reinforcedrheological materials are studied. Based on an energy criterion, asimple formula of local critical stress for interfacial debonding isderived and expressed... The mechanisms of interfacial debonding of particle reinforcedrheological materials are studied. Based on an energy criterion, asimple formula of local critical stress for interfacial debonding isderived and expressed in terms of the interfacial energy. Theparticle size effect on interface debond- ing can then be analyzedeasily owing to the fact that critical stress is inverselyproportional to the square root of particle radius. By takingPP/CaCO_3 system as an example, the present energy criterion iscompared with the mechanical debonding criterion, and it is foundthat under the condition that bond strength is equal to matrixstrength and particle radius not over 0.2μm, the mechanicaldebonding cri- terion can be automatically satisfied if the energycirterion is satisfied. 展开更多
关键词 particle reinforced rheological materials interfacial debonding energycriterion and mechanical debonding criterion
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