Effects of Primary Processing Techniques and Significance of Hall-Petch Strengthening on the Mechani

Effects of Primary Processing Techniques and Significance of Hall-Petch Strengthening on the Mechani

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Nanomaterials 2015 , 5 , 1256-1283; doi:10.3390/nano5031256 nanomaterials ISSN 2079-4991 Article Effects of Primary Processing Techniques and Significance of Hall-Petch Strengthening on the Mechanical Response of Magnesium Matrix Composites Containing TiO 2 Nanoparticulates Ganesh Kumar Meenashisundaram, Mui Hoon Nai and Manoj Gupta * Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore; E-Mails: [email protected] (G.K.M.); [email protected] (M.H.N.) * Author to whom correspondence should be addressed; E-Mail: [email protected]; Tel.: +65-6516-6358; Fax: +65-6779-1459. Academic Editor: Thomas Nann Received: 24 June 2015 / Accepted: 20 July 2015 / Published: 31 July 2015 Abstract: In the present study, Mg (1.98 and 2.5) vol % TiO 2 nanocomposites are primarily synthesized utilizing solid-phase blend-press-sinter powder metallurgy (PM) technique and liquid-phase disintegrated melt deposition technique (DMD) followed by hot extrusion. Microstructural characterization of the synthesized Mg-TiO 2 nanocomposites indicated significant grain refinement with DMD synthesized Mg nanocomposites exhibiting as high as ~47% for 2.5 vol % TiO 2 NPs addition. X-ray diffraction studies indicated that texture randomization of pure Mg depends not only on the critical amount of TiO 2 NPs added to the Mg matrix but also on the adopted synthesis methodology. Irrespective of the processing technique, theoretically predicted tensile yield strength of Mg-TiO 2 nanocomposites was found to be primarily governed by Hall-Petch mechanism. Among the synthesized Mg materials, solid-phase synthesized Mg 1.98 vol % TiO 2 nanocomposite exhibited a maximum tensile fracture strain of ~14.5%. Further, the liquid-phase synthesized Mg-TiO 2 nanocomposites exhibited higher tensile and compression properties than those primarily processed by solid-phase synthesis. The tensile-compression asymmetry values of the synthesized Mg-TiO 2 nanocomposite was found to be lower than that of pure Mg with solid-phase synthesized Mg 1.98 vol % TiO 2 nanocomposite exhibiting as low as 1.06. OPEN ACCESS
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Nanomaterials 2015 , 5 1257 Keywords: Mg (1.98 and 2.5) vol % TiO 2 nanocomposites; synthesis techniques; Hall-Petch mechanism; tensile properties; compression properties 1. Introduction Magnesium (Mg) is the lightest of all structural metals having a low density of 1.74 g/cm 3 which is approximately two-thirds that of Al (2.7 g/cm 3 ), one-fifth that of steel (7.9 g/cm 3 ) and in close comparison to that of plastics (0.92–2.17 g/cm 3 ) [1]. Contributing to approximately 2.7% by weight, Mg is the seventh most abundant element in the earth’s crust. Besides being light, Mg based materials also exhibit other important properties such as good castability, machinability, thermal stability, good damping characteristics, high specific mechanical properties and resistance to electromagnetic radiation [2–4].
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