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influence of Multi-pass Friction Stir Processing on Microstructure and Mechanical Properties of Die Cast Al–7Si–3Cu Aluminum Alloy

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Acta Metallurgica Sinica(English Letters) 2016年第5期29卷 431-440页

作者： L.John Baruch R.Raju V.Balasubramanian A.G.Rao i.dinaharan Department of Mechanical Engineering Madanapalle Institute of Technology and ScienceMadanapalleAndhra Pradesh 517325India Department of industrial Engineering College of EngineeringAnna UniversityChennaiTamil Nadu 600025India Department of Manufacturing Engineering Centre for Materials Joining and Research(CEMAJOR)Annamalai UniversityAnnamalai NagarChidambaramTamil Nadu608002India Marine Materials Division Naval Materials Research LaboratoryThaneMaharashtra 421506India Department of Mechanical Engineering Science University of JohannesburgAuckland Park Kingsway CampusJohannesburg 2006South Africa

The influence of overlap multi-pass friction stir processing on the microstructure and the mechanical properties, in particular, strength, ductility and hardness of die cast A1-7Si-3Cu aluminum alloy was investigated. it was observed that increase in the number of overlap passes friction stir processing resulted in significant refinement and redistribution of aluminum silicon eutectic phase and elimination of casting porosities. The microstructural refinement by the friction stir processing not only increases the ultimate tensile strength from 121 to 273 MPa, but also increases the ductility as observed by the increase in fracture strain from 1.8% to 10%. Analysis of the fractured surface reveals that the microstructural refinement obtained by friction stir processing plays a vital role in transforming the fracture mode from completely mixed mode to the ductile mode of the fracture with increasing number of passes. The change in the size, shape, morphology and distribution of eutectic silicon particles and elimination of the porosities are the main reasons for the increases in tensile strength and ductility due to friction stir processing.

关键词： Friction stir processing Overlap multi-pass Microstructure Mechanical properties

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influence of processing route on microstructure and wear resistance of fly ash reinforced AZ31 magnesium matrix composites

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Journal of Magnesium and Alloys 2019年第1期7卷 155-165页

作者： i.dinaharan S.C.Vettivel M.Balakrishnan E.T.Akinlabi Department of Mechanical Engineering Science University of JohannesburgAuckland Park Kingsway CampusJohannesburg 2006 GautengSouth Africa Department of Mechanical Engineering Chandigarh College of Engineering and TechnologyChandigarh 160019India Department of Mechanical Engineering Nehru Institute of Engineering and TechnologyCoimbatore 641105 Tamil NaduIndia

Utilizing fly ash(FA)as reinforcement for magnesium matrix composites(MMCs)brings down the production cost and the land *** alloy AZ31 was reinforced with FA particles(10 vol.%)successfully by two different processing methods namely conventional stir casting and friction stir processing(FSP).The microstructural features were observed using optical microscope,scanning electron microscope and electron backscatter *** sliding wear behavior was tested using a pin-on-disc wear *** stir cast composite showed inhomogeneous particle dispersion and coarse grain *** of the FA particles decomposed and reacted with the matrix alloy to produce undesirable ***,FSP composite showed superior particle dispersion and fine,equiaxed grains by dynamic *** particles encountered disintegration but there was no interfacial *** composite demonstrated higher strengthening and wear resistance to that of stir cast *** morphology of the worn surface and the wear debris were studied in detail.

关键词： Magnesium matrix composite Stir casting Friction stir processing Fly ash Wear

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Dry sliding wear behavior of AA6061/ZrB_2 in-situ composite

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Transactions of Nonferrous Metals Society of China 2012年第4期22卷 810-818页

作者： i.dinaharan N.MURUGAN Department of Mechanical Engineering Karunya UniversityCoimbatore-641 114Tamil NaduIndia Department of Mechanical Engineering Coimbatore Institute of TechnologyCoimbatore-641 014Tamil NaduIndia

The dry sliding wear behavior of AA6061/ZrB2 in-situ composite prepared by the reaction of inorganic salts K2ZrF6 and KBF4 with molten aluminum was *** attempt was made to develop a mathematical model to predict the wear rate of AA6061/（0-10%） ZrB2 in-situ ***-factor,five-level central composite rotatable design was used to minimize the number of *** factors considered are sliding velocity,sliding distance,normal load and mass fraction of ZrB2 *** effect of these factors on the wear rate of the fabricated composite was analyzed and the predicted trends were discussed by observing the wear surface *** in-situ formed ZrB2 particles enhance the wear performance of the *** wear rate of the composite bears a proportional relationship with the sliding velocity,sliding distance and normal load.

关键词： aluminum matrix composites ZrB2 dry sliding wear mathematical model

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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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Synthesize of AZ31/TiC magnesium matrix composites using friction stir processing

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Journal of Magnesium and Alloys 2015年第1期3卷 76-78页

作者： M.Balakrishnan i.dinaharan R.Palanivel R.Sivaprakasam Department of Mechanical Engineering Akshaya College of Engineering and TechnologyCoimbatore 642109Tamil NaduIndia Department of Mechanical Engineering V V College of EngineeringTisaiyanvilai 627657Tamil NaduIndia Department of Mechanical Engineering Roever College of Engineering and Technology621212 PerambalurTamil NaduIndia Department of Aeronautical Engineering Karpagam UniversityCoimbatore 641021Tamil NaduIndia

Friction stir processing(FSP)is a novel solid state technique to synthesize metal matrix *** the present work,an attempt has been made to synthesize AZ31/TiC magnesium matrix composites using FSP and to analyze the microstructure using scanning electron microscopy.A groove was prepared on 6 mm thick AZ31 magnesium alloy plates and compacted with TiC *** width of the groove was varied to result in four different volume fraction of TiC particles(0,6,12 and 18 vol.%).A single pass FSP was carried out using a tool rotational speed of 1200 rpm,traverse speed of 40 mm/min and an axial force of 10 *** electron microscopy was employed to study the microstructure of the synthesized *** results indicated that TiC particles were distributed uniformly in the magnesium matrix without the formation of *** was no interfacial reaction between the magnesium matrix and the TiC *** particles were properly bonded to the magnesium matrix.

关键词： Magnesium alloy Friction stir processing TiC Microstruture

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Prediction of influence of process parameters on tensile strength of AA6061/TiC aluminum matrix composites produced using stir casting

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Transactions of Nonferrous Metals Society of China 2016年第6期26卷 1498-1511页

作者： J.JEBEEN MOSES i.dinaharan S.JOSEPH SEKHAR Department of Mechanical Engineering St.Xavier's Catholic College of Engineering Department of Mechanical Engineering Science University of JohannesburgAuckland Park Kingsway Campus

Stir casting was used to produce AA6061/15%TiC （mass fraction） aluminum matrix composites （AMCs）. An empirical relationship was developed to predict the effect of stir casting parameters on the ultimate tensile strength （UTS） of AA6061/TiC AMCs. A central composite rotatable design consisting of four factors and five levels was used to minimize the number of experiments, i.e., castings. The factors considered were stirring speed, stirring time, blade angle and casting temperature. The effect of those factors on the UTS of AA6061/TiC AMCs was derived using the developed empirical relationship and elucidated using microstructural characterization. Each factor significantly influenced the UTS. The variation in the UTS was attributed to porosity content, cluster formation, segregation of TiC particles at the grain boundaries and homogenous distribution in the aluminum matrix.

关键词： aluminum matrix composite stir casting TiC tensile strength

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Mechanical and metallurgical properties of dissimilar friction stir welded AA5083-H111 and AA6351-T6 aluminum alloys

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Transactions of Nonferrous Metals Society of China 2014年第1期24卷 58-65页

作者： R.PALANiVEL P.KOSHY MATHEWS i.dinaharan N.MURUGAN Department of Mechanical Engineering Roever College of Engineering and Technology Department of Mechanical Engineering Kalaivani College of Technology Department of Mechanical Engineering V V College of Engineering Department of Mechanical Engineering Coimbatore Institute of Technology

The microstructure and mechanical characterization of dissimilar friction stir welded AA5083-H111 and AA6351-T6 aluminum alloys were studied. Three different welding speeds （36, 63 and 90 mm/min） were used to weld the dissimilar alloys. The effect of welding speed on mechanical and metallurgical properties was analyzed. it is found that the welding speed of 63 mm/min produces better mechanical and metallurgical properties than other welding speeds. The weld zone is composed of three kinds of microstructures, namely unmixed region, mechanically mixed region and mixed flow region. The fracture mode was observed to be a ductile fibrous fracture.

关键词： aluminum alloys friction stir welding welding speed tensile strength microstructure

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influence of tool rotational speed on microstructure and sliding wear behavior of Cu/B_4C surface composite synthesized by friction stir processing

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Transactions of Nonferrous Metals Society of China 2015年第1期25卷 95-102页

作者： R.SATHiSKUMAR i.dinaharan N.MURUGAN S.J.ViJAY Department of Mechanical Engineering Coimbatore Institute of Technology Department of Mechanical Engineering V V College of Engineering School of Mechanical Sciences Karunya University

An attempt was made to synthesize Cu/B4C surface composite using friction stir processing（FSP） and to analyze the influence of tool rotational speed on microstructure and sliding wear behavior of the composite. The tool rotational speed was varied from 800 to 1200 r/min in step of 200 r/min. The traverse speed, axial force, groove width and tool pin profile were kept constant. Optical microscopy and scanning electron microscopy were used to study the microstructure of the fabricated surface composites. The sliding wear behavior was evaluated using a pin-on-disc apparatus. The results indicate that the tool rotational speed significantly influences the area of the surface composite and the distribution of B4C particles. Higher rotational speed exhibits homogenous distribution of B4C particles, while lower rotational speed causes poor distribution of B4C particles in the surface composite. The effects of tool rotational speed on the grain size, microhardness, wear rate, worn surface and wear debris were reported.

关键词： surface composite friction stir processing rotational speed wear rate microstructure

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Production and characterization of rich husk ash particulate reinforced AA6061 aluminum alloy composites by compocasting

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Transactions of Nonferrous Metals Society of China 2015年第3期25卷 683-691页

作者： J.ALLWYN KiNGSLY GLADSTON N.MOHAMED SHERiFF i.dinaharan J.DAViD RAJA SELVAM Department of Mechanical Engineering SCAD College of Engineering and Technology Department of Mechanical Engineering PET Engineering College Department of Mechanical Engineering Science University of JohannesburgAuckland Park Kingsway Campus Centre for Research in Metallurgy (CRM) School of Mechanical SciencesKarunya University

Rice husk ash(RHA) is a potential particulate reinforcement to produce aluminum matrix composites(AMCs)*** method was applied to produce aluminum alloy AA6061 reinforced with various amounts(0,2%,4%,6%and 8%,mass fraction) of RHA *** prepared composites were characterized using X-ray diffraction and scanning electron microscopy.X-ray diffraction patterns of AA6061/RHA AMCs revealed the presence of RHA particles without the formation of any other intermetallic *** scanning electron micrographs showed a homogeneous distribution of RHA particles all over the aluminum *** distribution of RHA particles was ***,RHA particles were bonded well with the aluminum matrix and a clear interface *** reinforcement of RHA particles enhanced the microhardness and ultimate tensile strength(UTS) of the *** tensile behavior is correlated to the microstructure of the AMCs.

关键词： 6061 Al alloy aluminum matrix composite compocasting rice husk ash microstructure

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Microstructure and mechanical properties characterization of AA6061/TiC aluminum matrix composites synthesized by in situ reaction of silicon carbide and potassium fluotitanate

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Transactions of Nonferrous Metals Society of China 2016年第7期26卷 1791-1800页

作者： K.JESHURUN LiJAY J.DAViD RAJA SELVAM i.dinaharan S.J.ViJAY School of Mechanical Sciences Karunya University Center for Research in Metallurgy School of Mechanical SciencesKarunya University Department of Mechanical Engineering Science University of Johannesburg

Aluminum alloys AA6061 reinforced with various amounts （0, 2.5% and 5%, mass fraction） of TiC particles were synthesized by the in situ reaction of inorganic salt K2TiF6 and ceramic particle SiC with molten aluminum. The casting was carried out at an elevated temperature and held for a longer duration to decompose SiC to release carbon atoms. X-ray diffraction patterns of the prepared AMCs clearly revealed the formation of TiC particles without the occurrence of any other intermetallic compounds. The microstructure of the prepared AA6061/TiC AMCs was studied using field emission scanning electron microscope （FESEM） and electron backscatter diffraction （EBSD）. The in situ formed TiC particles were characterized with homogeneous distribution, clear interface, good bonding and various shapes such as cubic, spherical and hexagonal. EBSD maps showed the grain refinement action of TiC particles on the produced composites. The formation of TiC particles boosted the microhardness and ultimate tensile strength （UTS） of the AMCs.

关键词： aluminum matrix composite titanium carbide electron backscatter diffraction casting microstructure mechanical properties

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