Abstract
This study is aimed at understanding the ductility enhancing function of nanoparticles in a concentrated magnesium alloy (AZ81) nanocomposite. Al2O3 nanoparticles were selected for reinforcement purposes due to the well known affinity between magnesium and oxygen. AZ81 magnesium alloy was reinforced with Al2O3 nanoparticles using solidification processing followed by hot extrusion. The nanocomposite exhibited similar grain size and hardness to the monolithic alloy, reasonable nanoparticle distribution and non-dominant (0002) texture in the longitudinal direction. Compared to the monolithic alloy in both tension and compression, the nanocomposite exhibited higher failure strain (+66% and +18%, respectively) without significant compromise in strength, and higher energy absorbed until fracture (EA) (+71% and +12%, respectively). The beneficial effects of Al2O3 nanoparticle addition on the tensile and compressive ductility enhancement of AZ81 alloy is discussed in this paper.
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