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Title: Effect of ball milling the hybrid reinforcements on the microstructure and mechanical properties of Mg-(Ti + n-Al2O3) composites
Authors: Sankaranarayanan, S.
Jayalakshmi, S. 
Gupta, M. 
Keywords: Mechanical alloying
Mechanical properties
Metal matrix composites
Rapid solidification
Scanning electron microscopy (SEM)
Issue Date: 30-Jun-2011
Citation: Sankaranarayanan, S., Jayalakshmi, S., Gupta, M. (2011-06-30). Effect of ball milling the hybrid reinforcements on the microstructure and mechanical properties of Mg-(Ti + n-Al2O3) composites. Journal of Alloys and Compounds 509 (26) : 7229-7237. ScholarBank@NUS Repository.
Abstract: In this study, composites containing pure magnesium and hybrid reinforcements (5.6 wt.% titanium (Ti) particulates and 2.5 wt.% nanoscale alumina (n-Al2O3) particles) were synthesized using the disintegrated melt deposition technique followed by hot extrusion. The hybrid reinforcement addition into the Mg matrix was carried out in two ways: (i) by direct addition of the reinforcements into the Mg-matrix, Mg-(5.6Ti + 2.5n-Al2O3) and (ii) by pre-synthesizing the composite reinforcement by ball milling and its subsequent addition into the Mg-matrix, Mg-(5.6Ti + 2.5n-Al2O3)BM. Microstructural characterization revealed significant grain refinement due to reinforcement addition. The evaluation of mechanical properties indicated a significant improvement in microhardness, tensile and compressive properties of the composites when compared to monolithic magnesium. For the Mg-(5.6Ti + 2.5n-Al2O3) composite, wherein the reinforcements were directly added into the matrix, the improvement in strength properties occurred at the expense of ductility. For the Mg-(5.6Ti + 2.5n-Al2O 3)BM composites with pre-synthesized ball-milled reinforcements, the increase in strength properties was accompanied by an increase/retention of ductility. The observed difference in behaviour of the composites is primarily attributed to the morphology and distribution of the reinforcements obtained due to the ball-milling process, thereby resulting in composites with enhanced toughness. © 2011 Elsevier B.V. All rights reserved.
Source Title: Journal of Alloys and Compounds
ISSN: 09258388
DOI: 10.1016/j.jallcom.2011.04.083
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