An investigation of the synthesis,consolidation and mechanical behaviour of Al 6061 nanocomposites reinforced by TiC via mechanical alloying |
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| Affiliation: | 1. Department of Production Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India;2. Department of Mechanical Engineering, KPR Institute of Engineering and Technology, Coimbatore 641407, Tamil Nadu, India;3. Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India;4. Powder Metallurgy Shop, Heavy Alloy Penetrator Project, Tiruchirappalli 620025, Tamil Nadu, India;1. Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece;2. Physical Metallurgy Department, Materials Science Institute, The University of Miskolc, H-3515 Miskolc-Egyetemvaros, Hungary;1. St.Peter’s University, Chennai, Tamil Nadu, 600054, India;2. Dr.M.G.R.Educational and Research Institute, Chennai, Tamil Nadu, 600095, India;1. Department of Mechanical Engineering, Hacettepe University, 06935 Ankara, Turkey;2. Department of Metallurgy and Materials Engineering, Gazi University, 06500 Ankara, Turkey;1. Thapar Institute of Engineering and Technology, Patiala, India;2. Faculty of Meerut Institute of Engineering & Technology, Meerut, India |
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| Abstract: | Nanostructured Al 6061–x wt.% TiC (x = 0.5, 1.0, 1.5 and 2.0 wt.%) composites were synthesised by mechanical alloying with a milling time of 30 h. The milled powders were consolidated by cold uniaxial compaction followed by sintering at various temperatures (723, 798 and 873 K). The uniform distribution and dispersion of TiC particles in the Al 6061 matrix was confirmed by characterising these nanocomposite powders by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), differential thermal analysis (DTA) and transmission electron microscopy (TEM). The mechanical properties, specifically the green compressive strength and hardness, were tested. A maximum hardness of 1180 MPa was obtained for the Al 6061–2 wt.% TiC nanocomposite sintered at 873 K, which was approximately four times higher than that of the Al 6061 microcrystalline material. A maximum green compressive strength of 233 MPa was obtained when 2 wt.% TiC was added. The effect of reinforcement on the densification was studied and reported in terms of the relative density, sinterability, green compressive strength, compressibility and Vickers hardness of the nanocomposites. The compressibility curves of the developed nanocomposite powders were also plotted and investigated using the Heckel, Panelli and Ambrosio Filho and Ge equations. |
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| Keywords: | Mechanical alloying Nanocomposites Compressibility: sinterability |
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