Dynamic Tensile Properties of Magnesium Nanocomposite

Abstract:

In this study, a Mg-6wt%Al alloy and its composite containing 0.22vol% Al₂O₃ nanoparticles are fabricated using a disintegrated melt deposition technique, and samples are subjected to quasi-static and dynamic tension. Compared to quasi-static loading, both materials exhibit significantly higher yield stresses and tensile strengths, much better ductility, and thus a higher energy absorption capacity under dynamic tension. In terms of nanoparticle addition, its influence on the mechanical properties are not notable; enhancement of the elastic modulus, yield stress and tensile strength are negligible, and there is a small reduction in ductility. The tensile behaviour obtained in this investigation was compared with results of previous compression tests, and significant tension-compression asymmetry in the response is observed. The tensile yield stress is noticeably larger than that in compression, and the profile of the stress-strain curve for tension differs from that for compression – it is convex upwards for tension, but concave upwards for compression. A possible reason for this asymmetry is the occurrence of twinning in compression and its absence in tension.

• Periodical: Materials Science Forum (Volumes 706-709)
• Pages: 780-785
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.706-709.780
• Online since: January 2012
• Authors: Y.B. Guo, V.P.W. Shim, B. W. F. Tan
• Keywords: Dynamic Loading, Magnesium Nanocomposite, Split Hopkinson Tensile Bar

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DOI: 10.1016/0956-716x(94)90159-7