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Title: Nanoparticle interactions with the magnesium alloy matrix during physical deformation: Tougher nanocomposites
Authors: Paramsothy, M. 
Chan, J.
Kwok, R.
Gupta, M. 
Keywords: Composite materials
Transmission electron microscopy (TEM)
Issue Date: 14-Dec-2012
Citation: Paramsothy, M., Chan, J., Kwok, R., Gupta, M. (2012-12-14). Nanoparticle interactions with the magnesium alloy matrix during physical deformation: Tougher nanocomposites. Materials Chemistry and Physics 137 (2) : 472-482. ScholarBank@NUS Repository.
Abstract: This study is aimed at understanding the toughness enhancing function of nanoparticles in magnesium nanocomposites, focussing on experimentally observed nanoparticle-matrix interactions during physical deformation. Al 2O3 nanoparticles were selected for reinforcement purposes due to the well known affinity between magnesium and oxygen. AZ31/AZ91 (hybrid alloy) and ZK60A magnesium alloys were reinforced with Al2O 3 nanoparticles using solidification processing followed by hot extrusion. In tension, each nanocomposite exhibited higher ultimate strength and ductility than the corresponding monolithic alloy. However, the increase in ductility exhibited by ZK60A/Al2O3 (+170%) was significantly higher than that exhibited by AZ31/AZ91/Al2O 3 (+99%). The previously unreported and novel formation of high strain zones (HSZs, from nanoparticle surfaces inclusive) during tensile deformation is highlighted here as a significant mechanism supporting ductility enhancement in ZK60A/Al2O3 (+170% enhanced) and AZ31/AZ91/Al2O3 (+99% enhanced) nanocomposites. Also, ZK60A/Al2O3 exhibited lower and higher compressive strength and ductility (respectively) compared to ZK60A while AZ31/AZ91/Al 2O3 exhibited higher and unchanged compressive strength and ductility (respectively) compared to AZ31/AZ91. Here, the previously unreported nanograin formation (recrystallization) during room temperature compressive deformation as a toughening mechanism in relation to nanoparticle stimulated nucleation (NSN) ability is also highlighted. © 2012 Elsevier B.V. All rights reserved.
Source Title: Materials Chemistry and Physics
ISSN: 02540584
DOI: 10.1016/j.matchemphys.2012.09.036
Appears in Collections:Staff Publications

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