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Influence of Micron-Ti and Nano-Cu Additions on the Microstructure and Mechanical Properties of Pure Magnesium
Department of Mechanical Engineering, National University of Singapore (NUS), 9 Engineering Drive 1, Singapore 117576, Singapore
Mechanical and Industrial Engineering Department, Qatar University, P.O. Box No. 2713, Doha, Qatar
* Author to whom correspondence should be addressed.
Received: 26 April 2012; in revised form: 6 August 2012 / Accepted: 10 August 2012 / Published: 17 August 2012
Abstract: In this study, metallic elements that have limited/negligible solubility in pure magnesium (Mg) were incorporated in Mg using the disintegrated melt deposition technique. The metallic elements added include: (i) micron sized titanium (Ti) particulates with negligible solubility; (ii) nano sized copper (Cu) particulates with limited solubility; and (iii) the combination of micro-Ti and nano-Cu. The combined metallic addition (Ti + Cu) was carried out with and without preprocessing by ball-milling. The microstructure and mechanical properties of the developed Mg-materials were investigated. Microstructure observation revealed grain refinement due to the individual and combined presence of hard metallic particulates. The mechanical properties evaluation revealed a significant improvement in microhardness, tensile and compressive strengths. Individual additions of Ti and Cu resulted in Mg-Ti composite and Mg-Cu alloy respectively, and their mechanical properties were influenced by the inherent properties of the particulates and the resulting second phases, if any. In the case of combined addition, the significant improvement in properties were observed in Mg-(Ti + Cu)BM composite containing ball milled (Ti + Cu) particulates, when compared to direct addition of Ti and Cu particulates. The change in particle morphology, formation of Ti3Cu intermetallic and good interfacial bonding with the matrix achieved due to preprocessing, contributed to its superior strength and ductility, in case of Mg-(Ti + Cu)BM composite. The best combination of hardness, tensile and compressive behavior was exhibited by Mg-(Ti + Cu)BM composite formulation.
Keywords: magnesium composites; metallic additions; mechanical alloying; microstructure; mechanical properties; Scanning Electron Microscopy (SEM)
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Seetharaman, S.; Subramanian, J.; Gupta, M.; Hamouda, A.S. Influence of Micron-Ti and Nano-Cu Additions on the Microstructure and Mechanical Properties of Pure Magnesium. Metals 2012, 2, 274-291.
Seetharaman S, Subramanian J, Gupta M, Hamouda AS. Influence of Micron-Ti and Nano-Cu Additions on the Microstructure and Mechanical Properties of Pure Magnesium. Metals. 2012; 2(3):274-291.
Seetharaman, Sankaranarayanan; Subramanian, Jayalakshmi; Gupta, Manoj; Hamouda, Abdelmagid S. 2012. "Influence of Micron-Ti and Nano-Cu Additions on the Microstructure and Mechanical Properties of Pure Magnesium." Metals 2, no. 3: 274-291.