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Title: High temperature tensile response of nano-Al 2O 3 reinforced AZ31 nanocomposites
Authors: Hassan, S.F.
Paramsothy, M. 
Patel, F.
Gupta, M. 
Keywords: AZ31
High-temperature strength
Nano-Al 2O 3
Issue Date: 15-Dec-2012
Citation: Hassan, S.F., Paramsothy, M., Patel, F., Gupta, M. (2012-12-15). High temperature tensile response of nano-Al 2O 3 reinforced AZ31 nanocomposites. Materials Science and Engineering A 558 : 278-284. ScholarBank@NUS Repository.
Abstract: Nano-Al 2O 3 reinforcement's capability to simultaneously enhance the room temperature (25°C) strength and ductility of magnesium alloys has effectively been exploited in ingot metallurgy processed AZ31/1.5Al 2O 3 nanocomposite in this study. Tensile characterization revealed that at high temperature (150-250°C), instead of strengthening, the thermally stable nano-Al 2O 3 reinforcement ironically exacerbated the softening of AZ31 alloy. However, an incredible increment in AZ31 alloy (with grain size of ~2.3μm) ductility (up to 184%) has been achieved in the nanocomposite with increasing temperature due to the incorporation of nano-Al 2O 3 as reinforcement. Microstructural characterization of the nanocomposite revealed that the dynamic recrystallization process has induced a complete recrystallization in AZ31 alloy matrix at a relatively much lower temperature (150°C) with tremendous grain growth near the fracture surface at higher temperature (250°C). Fractography of the nanocomposite revealed that the room temperature mixed ductile mode fracture behavior of AZ31 alloy transformed to a complete ductile mode at high temperature due to the presence of nano-Al 2O 3 particulates. © 2012 Elsevier B.V.
Source Title: Materials Science and Engineering A
ISSN: 09215093
DOI: 10.1016/j.msea.2012.08.002
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