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Title: Hierarchical magnesium nano-composites for enhanced mechanical response
Authors: Habibi, M.K.
Joshi, S.P. 
Gupta, M. 
Keywords: Al and Al2O3 reinforcements
Ball milling
Hierarchical nano-composite
Magnesium metal matrix composite
Powder metallurgy
Issue Date: Oct-2010
Citation: Habibi, M.K., Joshi, S.P., Gupta, M. (2010-10). Hierarchical magnesium nano-composites for enhanced mechanical response. Acta Materialia 58 (18) : 6104-6114. ScholarBank@NUS Repository.
Abstract: In this work we have synthesized and investigated the mechanical performance of a hierarchical magnesium (Mg) nano-composite with a novel micro-architecture including a reinforcing constituent that is a composite in itself. Specifically, we developed a nano-composite (alternatively referred to as a level II composite) with monolithic Mg as the matrix, reinforced by another level I composite comprising a sub-micron pure aluminum (Al) matrix in which are embedded nano-alumina (n-Al2O3) particles. The level II composite was obtained by adding a small volume fraction (vf) of the ball-milled level I composite to Mg using the powder metallurgy route followed by microwave-assisted rapid sintering and hot extrusion. Compared with the monolithic pure Mg, the hierarchical composites exhibited significant simultaneous enhancement of strengthening, hardening and failure strain, and also non-monotonic mechanical performance as a function of level I vf. Among the different hierarchical formulations synthesized, the hierarchical level I composition with 0.972% Al and 0.66% Al2O3 by volume (Mg/0.972 Al-0.66 Al2O3) exhibited the best overall mechanical properties compared with monolithic Mg, with an improvement of 96% in the 0.2% yield strength, 80% in the ultimate tensile strength, 42% in failure strain and 147% in the work of fracture. We identified and quantified some of the strengthening mechanisms that may be responsible for the impressive performance of this hierarchical nano-composite. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Source Title: Acta Materialia
ISSN: 13596454
DOI: 10.1016/j.actamat.2010.07.028
Appears in Collections:Staff Publications

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