Abstract
Al2O3 nanoparticle-reinforced Al-12Si matrix composites were successfully fabricated by hot pressing and subsequent hot extrusion. The influence of weight fraction of Al2O3 particles on the microstructure, mechanical properties, and the corresponding strengthening mechanisms were investigated in detail. The Al2O3 particles are uniformly distributed in the matrix, when 2 and 5 wt. % of Al2O3 particles were added to the Al-12Si matrix. Significant agglomeration can be found in composites with 10 wt. % addition of Al2O3 nanoparticles. The maximum hardness, the yield strength, and tensile strength were obtained for the composite with 5 wt. % Al2O3 addition, which showed an increase of about ~11%, 23%, and 26%, respectively, compared with the Al-12Si matrix. Meanwhile, the elongation increased to about ~30%. The contribution of different mechanisms including Orowan strengthening, thermal mismatch strengthening, and load transfer strengthening were analyzed. It was shown that the thermal mismatch strengthening has a more significant contribution to strengthening these composites than the Orowan and load transfer strengthening mechanisms.
Highlights
Al metal matrix composites (MMCs) have gained considerable attention as the ideal candidates for potential lightweight materials used in automobiles and other structural applications because of their attractive properties, such as low density, high specific stiffness, and superior wear resistance [1,2,3,4,5,6].Recently, nano-sized reinforcements have been examined for the fabrication of Al-based composites.It has been shown that the addition of a small amount of fine ceramic particles improves the strength significantly [7,8]
A large number of studies have been performed on the fabrication and characterization of nano-sized Al2 O3 -reinforced Al matrix composites
Karbalaei Akbari et al [11] studied nano-sized Al2 O3 -reinforced A356 alloy with stirring casting, and agglomerated nanoparticles were observed on dendrites in the fracture surface of the
Summary
Al metal matrix composites (MMCs) have gained considerable attention as the ideal candidates for potential lightweight materials used in automobiles and other structural applications because of their attractive properties, such as low density, high specific stiffness, and superior wear resistance [1,2,3,4,5,6].Recently, nano-sized reinforcements have been examined for the fabrication of Al-based composites.It has been shown that the addition of a small amount of fine ceramic particles improves the strength significantly [7,8]. Al metal matrix composites (MMCs) have gained considerable attention as the ideal candidates for potential lightweight materials used in automobiles and other structural applications because of their attractive properties, such as low density, high specific stiffness, and superior wear resistance [1,2,3,4,5,6]. Nano-sized reinforcements have been examined for the fabrication of Al-based composites. Al2 O3 particles with high specific stiffness and superior high temperature properties are used as inert ceramic reinforcement phases in MMCs [9,10]. A large number of studies have been performed on the fabrication and characterization of nano-sized Al2 O3 -reinforced Al matrix composites. Karbalaei Akbari et al [11] studied nano-sized Al2 O3 -reinforced A356 alloy with stirring casting, and agglomerated nanoparticles were observed on dendrites in the fracture surface of the
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