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Microstructural Characterization and Tensile Behavior of Rutile(TiO_2)-Reinforced AA6063 Aluminum Matrix Composites Prepared by Friction Stir Processing

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Acta Metallurgica Sinica(English Letters) 2019年第1期32卷 52-62页

作者： Sahayam Joyson Abraham Isaac Dinaharan jebaraj david raja selvam Esther Titilayo Akinlabi Department of Mechanical Engineering V V College of Engineering Department of Mechanical Engineering Science University of Johannesburg Auckland Park Kingsway Campus Department of Mechanical Engineering Karunya Institute of Technology and Sciences

Rutile(TiO_2) particle-reinforced aluminum matrix composites were prepared by friction stir processing. The microstructure was studied using conventional and advanced characterization techniques. TiO_2 particles were found to be dispersed uniformly in the composite. Clusters of TiO_2 particles were observed at a higher particle content of 18 vol%. The interface between the TiO_2 particle and the aluminum matrix was characterized by the absence of pores and reactive ***-grain boundaries, ultra-fine grains and dislocation density were observed in the composites. TiO_2 particles improved the mechanical properties of the composites. However, a drop in tensile strength was observed at a higher particle content due to cluster formation. All the prepared composites exhibited ductile mode of fracture.

关键词： Aluminum matrix composites Friction stir processing Rutile Microstructure Tensile strength

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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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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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