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Microstructure and wear characteristics of ATZ ceramic particle reinforced gray iron matrix surface composites

China Foundry 2018年第3期15卷 167-172页

作者： Xue Ma Liang-feng Li Fan Zhang Zu-hua Zhang Hao Wang En-ze Wang School of Materials Science and Engineering Southwest University of Science and Technology Chengdu Aerospace Superalloy Technology Co. Ltd Centre for Future Materials University of Southern Queensland

The alumina toughened zirconia(ATZ) ceramic particle reinforced gray iron matrix surface composite was successfully manufactured by pressureless infi ltration. The porous preform played a key role in the infi ltrating progress. The microstructure was observed by scanning electron microscopy(SEM); the phase constitutions was analyzed by X-ray diffraction(XRD); and the hardness and wear resistance of selected specimens were tested by hardness testing machine and abrasion testing machine, respectively. The addition of high carbon ferrochromium powders leads to the formation of white iron during solidifi cation. The wear volume loss rates of ATZ ceramic particle reinforced gray iron matrix surface composite decreases fi rst, and then tends to be stable. The wear resistance of the composite is 2.7 times higher than that of gray iron matrix. The reason is a combination of the surface hardness increase of gray iron matrix and ATZ ceramic particles and alloy carbides protecting effect on gray iron matrix.

关键词： metal-matrix surface composites pressureless infiltrating particle-reinforcement surface alloying wear testing

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Dry sliding wear behavior of stir cast AA6061-T6/AlN_p composite

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Transactions of Nonferrous Metals Society of China 2014年第9期24卷 2785-2795页

作者： B.ASHOK KUMAR N.MURUGAN I.DINAHARAN Department of Mechanical Engineering Faculty of EngineeringErode Builder Educational Trust’s Group of InstitutionsNathakadaiyur Kangayam – 638108 Tirupur District Tamil Nadu India Department of Mechanical Engineering Coimbatore Institute of TechnologyCoimbatore – 641014 Tamil Nadu India Department of Mechanical Engineering V V College of Engineering Tisaiyanvilai – 627657 Tamil Nadu India

The dry sliding wear behavior of AA6061 matrix composite reinforced with aluminium nitride particles（AlN） produced by stir casting process was investigated. A regression model was developed to predict the wear rate of the prepared composite. A four-factor, five-level central composite rotatable design matrix was used to minimize the number of experimental runs. The factors considered in this study were sliding velocity, sliding distance, normal load and mass fraction of AlN reinforcement in the matrix. The developed regression model was validated by statistical software SYSTAT 12 and statistical tools such as analysis of variance（ANOVA） and student＇s t test. It was found that the developed regression model could be effectively used to predict the wear rate at 95% confidence level. The influence of these factors on wear rate of AA6061/AlNp composite was analyzed using the developed regression model and predicted trends were discussed with the aid of worn surface morphologies. The regression model indicated that the wear rate of cast AA6061/AlNp composite decreased with an increase in the mass fraction of AlN and increased with an increase of the sliding velocity, sliding distance and normal load acting on the composite specimen.

关键词： aluminium matrix composite particle-reinforcement wear regression model

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Comparison of wear behaviour of LM13 Al−Si alloy based composites reinforced with synthetic(B_(4)C)and natural(ilmenite)ceramic particles

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Transactions of Nonferrous Metals Society of China 2021年第12期31卷 3613-3625页

作者： Rahul GUPTA Tarun NANDA O.P.PANDEY Mechanical Engineering Department Thapar Institute of Engineering and TechnologyPatiala 147004PunjabIndia School of Physics and Materials Science Thapar Institute of Engineering and TechnologyPatiala 147004PunjabIndia

Dry sliding wear behaviour of stir-cast aluminium matrix composites(AMCs)containing LM13 alloy as matrix and ceramic particles as reinforcement was *** different ceramic particle reinforcements were used separately:synthetic ceramic particles(B_(4)C),and natural ceramic particles(ilmenite).Optical micrographs showed uniform dispersion of reinforced particles in the matrix *** particles refined the grain size of eutectic silicon and changed its morphology to globular type.B_(4)C reinforced composites(BRCs)showed maximum improvement in hardness of *** reinforced composites(IRCs)showed maximum reduction in coefficient of friction values due to strong matrix−reinforcement interfacial bonding caused by the formation of interfacial *** sliding wear behaviour of composites was significantly improved as compared to base *** low density and high hardness of B_(4)C particles resulted in high dislocation density around filler particles in *** the other hand,the low thermal conductivity of ilmenite particles resulted in early oxidation and formation of a tribo-layer on surface of ***,both types of reinforcements led to the improvement in wear properties of AMCs,though the mechanisms involved were very ***,the low-cost ilmenite particles can be used as alternative fillers to the high-cost B_(4)C particles for processing of wear resistant composites.

关键词： aluminium matrix composites ilmenite boron carbide particle-reinforcement wear test tribolayer XRD analysis SEM−EDS

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High throughput construction for the deformation mechanism diagram and dynamic recrystallization of a bimodal-sized particle-reinforced Ti-2.5Zr-2Al-1(Si,C)titanium alloy

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Materials Genome Engineering Advances 2023年第1期1卷 132-145页

作者： Yixin An Kechao Zhou Shaohong Wei Shiyan Zhu Yechen Deng Yangzhihong Xiao Xiaoyong Zhang Yubin Ke Bingfeng Wang State Key Laboratory of Powder Metallurgy Central South UniversityChangshaChina School of Materials Science and Engineering Central South UniversityChangshaChina Spallation Neutron Source Science Center DongguanChina Institute of High Energy Physics Chinese Academy of SciencesBeijingChina

An in situ autogenous particle-reinforced Ti-2.5Zr-2Al-1(Si,C)titanium alloy is prepared by vacuum induction *** wide range of an effective strain between 0.2 and 1.2 and the corresponding microstructure are obtained by the double-cone high-throughput compression test and finite element *** deformation mechanism diagram with strains of 0.2-1.2 and strain rates of 0.7-1.5 s^(-1)at 900℃ is *** the strain rate is 1.3 s^(-1),dynamic recovery occurs in the small strain range(1.182),resulting in the deformation ***-angle annular dark field and high-resolution transmission electron microscopy are used to determine the existence of bimodal particle distribution,namely micron-scale TiC particles and nano-scale Ti5Si3 and(Zr,Si)*** average radius of the(Zr,Si)nanoparticles measured by small angle neutron scattering is 19.3 nm,and the volume fraction is 0.35%.DRX grains with an average size of 0.49μm are obtained at 900°C,strain rate of 1.3 s^(-1),and strain of about ***-scale particles stimulated DRX nucleation,while nanoscale particles hindered the growth of new grains,resulting in grain refinement.

关键词： deformation mechanism diagram dynamic recrystallization particle-reinforcement small angle neutron scattering titanium alloys

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