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Reinforcing Low-Volume Fraction Nano-TiN Particulates to Monolithical, Pure Mg for Enhanced Tensile and Compressive Response

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Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore
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Mechanical Engineering Department, College of Engineering, King Saud University, PO Box 800, Riyadh 11421, Saudi Arabia
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Author to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Materials 2016, 9(3), 134; https://doi.org/10.3390/ma9030134
Received: 26 December 2015 / Revised: 12 February 2016 / Accepted: 23 February 2016 / Published: 26 February 2016
Novel Mg (0.58, 0.97, 1.98 and 2.5) vol. % TiN nanocomposites containing titanium nitride (TiN) nanoparticulates of ~20 nm size are successfully synthesized by a disintegrated melt deposition technique followed by hot extrusion. Microstructural characterization of Mg-TiN nanocomposites indicate significant grain refinement with Mg 2.5 vol. % TiN exhibiting a minimum grain size of ~11 μm. X-ray diffraction studies of Mg-TiN nanocomposites indicate that addition of up to 1.98 vol. % TiN nanoparticulates aids in modifying the strong basal texture of pure Mg. An attempt is made to study the effects of the type of titanium (metal or ceramic), size, and volume fraction addition of nanoparticulates on the microstructural and mechanical properties of pure magnesium. Among the major strengthening mechanisms contributing to the strength of Mg-Ti-based nanocomposites, Hall-Petch strengthening was found to play a vital role. The synthesized Mg-TiN nanocomposites exhibited superior tensile and compression properties indicating significant improvement in the fracture strain values of pure magnesium under loading. Under tensile and compression loading the presence of titanium (metal or ductile phase) nanoparticulates were found to contribute more towards the strengthening, whereas ceramics of titanium (brittle phases) contribute more towards the ductility of pure magnesium. View Full-Text
Keywords: Mg (0.58, 0.97, 1.98, 2.5) vol. % TiN; nanocomposites; grain refinement; X-ray diffraction; tensile; compression; Hall-Petch mechanism; titanium (metal or ceramic); nanoparticulates Mg (0.58, 0.97, 1.98, 2.5) vol. % TiN; nanocomposites; grain refinement; X-ray diffraction; tensile; compression; Hall-Petch mechanism; titanium (metal or ceramic); nanoparticulates
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Meenashisundaram, G.K.; Nai, M.H.; Almajid, A.; Gupta, M. Reinforcing Low-Volume Fraction Nano-TiN Particulates to Monolithical, Pure Mg for Enhanced Tensile and Compressive Response. Materials 2016, 9, 134.

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