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Title: Hot workability and deformation mechanisms in Mg/nano-Al2O3 composite
Authors: Prasad, Y.V.R.K.
Rao, K.P.
Gupta, M. 
Keywords: A. Metal-matrix composites
B. Plastic deformation
C. Modelling
D. Optical microscopy
E. Extrusion
Issue Date: Jun-2009
Citation: Prasad, Y.V.R.K., Rao, K.P., Gupta, M. (2009-06). Hot workability and deformation mechanisms in Mg/nano-Al2O3 composite. Composites Science and Technology 69 (7-8) : 1070-1076. ScholarBank@NUS Repository.
Abstract: The response of extruded Mg/nano-Al2O3 (1 vol.%) composite to hot working in the temperature range 300-500 °C and strain rate range 0.0003-10 s-1 has been characterized using processing map and kinetic analysis. The hot working window for the composite occurs at strain rates >0.1 s-1 and the optimum range of temperature is 400-450 °C. In this window, the behavior of the composite is similar to that of the matrix and is controlled by the grain boundary self-diffusion. At lower strain rates, however, the composite exhibits much higher apparent activation energy than that for lattice self-diffusion unlike the matrix material. The deformed microstructures revealed that the prior particle boundaries decorated by the nano-Al2O3 particles, are stable and do not slide, rotate or migrate but kink after compressive deformation and as such contribute to the high temperature strength of the composite. © 2009 Elsevier Ltd. All rights reserved.
Source Title: Composites Science and Technology
ISSN: 02663538
DOI: 10.1016/j.compscitech.2009.01.032
Appears in Collections:Staff Publications

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