As-cast magnesium AM60-based hybrid nanocomposite containing alumina fibres and nanoparticles: Microstructure and tensile behavior

Magnesium AM60 based metal matrix hybrid nanocomposite (MHNC) reinforced with alumina (Al2O3) fibre and nano-sized Al2O3 particles was successfully fabricated by a perform-squeeze casting technique under an applied pressure of 90 MPa. Tensile properties of the unreinforced AM60 alloy, Al2O3 fibre/AM...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-01, Vol.740-741, p.305-314
Main Authors: Zhou, Junxiang, Ren, Luyang, Geng, Xinyu, Fang, Li, Hu, Henry
Format: Article
Language:English
Subjects:
Al2O3 nanoparticles
Aluminum oxide
Cracking (fracturing)
Damage localization
Dislocation density
Ductility
Fibers
Fracture mechanics
Grain refinement
Hybrid composites
Hybrid nanocomposite
Magnesium
Magnesium alloy (AM60)
Magnesium base alloys
Microscopes
Microstructure
Nanocomposites
Nanoparticles
Particulate composites
Pressure casting
Restoration
Squeeze casting
Tensile properties
Transmission electron microscopy
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Summary:Magnesium AM60 based metal matrix hybrid nanocomposite (MHNC) reinforced with alumina (Al2O3) fibre and nano-sized Al2O3 particles was successfully fabricated by a perform-squeeze casting technique under an applied pressure of 90 MPa. Tensile properties of the unreinforced AM60 alloy, Al2O3 fibre/AM60 composite, hybrid composite containing both Al2O3 fibres, and micron and/or nano-sized Al2O3 particles were evaluated. The addition of fibres and/or micron-sized particles significantly improves the ultimate tensile and yield strengths of the matrix alloy from 171 and 81 MPa to 192 and 142 MPa, respectively, while a substantial reduction (73%) in ductility from 6.0% to only 1.6% is observed. The replacement of the micron particles with the nano-sized Al2O3 particles into the hybrid composite restores the ductility from 1.6% to 3.5%. Microstructure analyses via optical (OM) and scanning electron (SEM) microscopes suggest that the homogeneous distribution, clean interfacial structure and grain refinement result in the high strengths of the magnesium hybrid nanocomposite (MHNC). The observation by transmission electron microscopy (TEM) indicates that the presence of a relatively low dislocation density in the matrix grains of the MHNC benefits the ductility restoration. The SEM fractography shows that the fracture mode of the composites is the evolution of localized damages, such as particles and fibres damage and cracking, matrix fracture, and interface debonding, which are consistent with the tensile results.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.10.070