Hybridizing boron carbide (B4C) particles with aluminum (Al) to enhance the mechanical response of magnesium based nano-composites

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[1] [1,Habibi, Meisam K.
[2] Hamouda, Abdelmagid S.
[3] Gupta, Manoj
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Gupta, M. (mpegm@nus.edu.sg) | 1600年 / Elsevier Ltd卷 / 550期
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In this work; we synthesized and investigated the mechanical performance of magnesium (Mg) nano-composites containing either B4C or hybrid Al-B4C particles (B4C particles hybridized with Al using ball milling) synthesized through powder metallurgy route using microwave assisted rapid sintering technique followed by hot extrusion. Compared to monolithic Mg; microstructural characterizations revealed presence of porosity along the particles boundaries and reduction in average matrix grain size. Among the different nano-composite formulations; the Mg/0.66B4C nano-composite exhibited the best improvement; though marginal; in tensile yield strength (0.2% YS); compressive yield strength (0.2% CYS); ultimate tensile strength (UTS); ultimate compressive strength (UCS) and tensile failure strain (FSt) (up to +10%; +7.5%; +2%; +36%; and; 12%; respectively) compared to pure Mg while compressive failure strain (FSc) was compromised. To improve the mechanical response of Mg/B4C nano-composites further; the best observed B4C content was hybridized with Al to outcome hybrid Al-B4C particles. The effect of presence of hybridized B 4C particles with Al (Al-B4C) in the case of hierarchical Mg/0.92Al-0.66B4C configuration exhibits an improvement of +8.3% (0.2% YS); +29% (0.2% CYS); +45% (UTS) and +6.2 (UCS) compared to its Mg/0.66B4C nano-composite counterpart whereas both FSt and FSc were compromised. Considering the crystallographic texture; the effect of presence of B4C particles (either solely or as hybrid particle forms) on textural evolution of Mg is also investigated here. © 2012 Elsevier B.V. All rights reserved;
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