Development and Characterization of Ductile MgY2O3 Nanocomposites

[+] Author and Article Information
S. F. Hassan, M. Gupta

Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575

J. Eng. Mater. Technol 129(3), 462-467 (Jan 11, 2007) (6 pages) doi:10.1115/1.2744418 History: Received July 03, 2006; Revised January 11, 2007

Nano-Y2O3 particulates containing ductile magnesium nanocomposites were synthesized using blend-press-sinter powder metallurgy technique followed by hot extrusion. Microstructural characterization of the nanocomposite samples showed fairly uniform reinforcement distribution, good reinforcement-matrix interfacial integrity, significant grain refinement of magnesium matrix with increasing presence of reinforcement, and the presence of minimal porosity. Mechanical properties characterization revealed that the presence of nano-Y2O3 reinforcement leads to marginal increases in hardness, 0.2% yield strength and ultimate tensile strength, but a significant increase in ductility and work of fracture of magnesium. The fracture mode was changed from brittle for pure Mg to mix ductile and intergranular in the case of nanocomposites.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Representative micrographs showing nano-Y2O3 reinforcement distribution in the case of Mg∕1.11Y2O3 nanocomposite (using FESEM) in (a) and grain morphology for Mg and Mg∕0.22Y2O3 in (b) and (c), respectively

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Figure 2

Representative graphs showing tensile stress-strain behavior of magnesium and nanocomposites

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Figure 3

Representative SEM fractographs showing (a) cleavage steps in Mg, (b) dimples in Mg∕0.22Y2O3, and (c) intergranular crack propagation with increasing presence of microcracks in Mg∕1.11Y2O3, respectively

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Figure 4

Representative SEM fractographs showing (a) straight lines due to slip in the basal plane in Mg and (b) uneven lines due to combined effect of basal and non-basal slip in Mg∕0.22Y2O3, respectively



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