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Dynamic Tensile Response of Magnesium Nanocomposites

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Abstract:

AZ31-based magnesium nanocomposites were produced by a disintegrated melt deposition technique, whereby different volume fractions of 50-nm Al2O3 nanoparticles (1.0v%, 1.4v% and 3.0v%) were used as reinforcement and added to AZ31 Mg alloy. A monolithic counterpart was also produced by the same process for comparison. Samples of these materials were subjected to dynamic tension at strain rates up to 1.2 103 s-1, using a split-Hopkinson Bar device. Compared to the quasi-static response, the monolithic and composite materials showed significantly increased yield stress and ductility under dynamic loading. The enhancement in yield stress with strain rate indicates rate sensitivity of the critical resolved shear stress for slip systems under tension. The addition of nanoparticles was found to reduce the grain size of the resulting material and increase the yield stress and ductility simultaneously, for both low and high rate loading.

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Periodical:

Applied Mechanics and Materials (Volume 566)

Pages:

56-60

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.566.56

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Cite this paper

Online since:

June 2014

Authors:

Y. Chen*, V.P.W. Shim, Manoj Gupta

Keywords:

Magnesium Nanocomposites, Nanoparticle, Strain Rate, Tension

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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