Influence of nanosized Al₂O₃weight percentage on microstructure and mechanical properties of Al–matrix nanocomposite

Abstract

Aluminium based metal matrix composites produced by powder metallurgy are used in the aerospace and automobile industries because of their high strength, light weight, etc. The properties may become much better when nanosized reinforcements are used. In this research, the morphological, microstructural and mechanical properties changes during nanosized alumina increment to Al powder were studied. Because nanosized particles are extremely prone to agglomeration, all of the samples have been milled for 12 h by a planetary ball mill. The process was conducted for Al-(0-20) wt-%Al 2 O 3 powders to explore the role of reinforcement nanoparticles on the microstructure and mechanical properties. The results showed that the strength, ductility and hardness were increased by increasing the reinforcement nanoparticles weight percentage. Also, addition of hard particles accelerated the milling process, leading to faster work hardening rate and fracture of the aluminium powder.

Microstructural characterization of ball-milled metal matrix nanocomposites (Cr, Ni, Ti)-25 wt% (Al2O3np, SiCnp)

“…However, one of the negative characteristics of nanoparticles is the high tendency of their agglomeration and cluster formation. Uncontrolled agglomeration, which occurs through van der Waals forces, is a common phenomenon that increases the inhomogeneity of composite structures (Mahboob, Sajjadi, and Zebarjad 2011;Pramanik and Littlefair 2013;Mohanty et al 2014). One method to overcome this obstacle is ball milling.…”

Sensitivity analysis of mechanical properties and ductile/brittle behaviors in aluminum‐silicon alloy to loading rate and nano‐particles, considering interaction effects

“…In this study, silica (SiO 2 ) nano‐particles were considered as reinforcing particles. Nano‐particles, with the size of 20–30 nm 23,24 were selected and prepared by ball‐milling to have a proper distribution of nano‐particles in the molten. For such an objective, aluminum micro‐particles were coated by SiO 2 nano‐particles, during ball‐milling 25,26 .…”

Nanoindentation, Compressive and Tensile Deformation Study of In-Situ Al–AlN Metal Matrix Composites

“…It is well known that, formation of agglomerates affect the uniform distribution of particulates in matrix. Further, higher agglomeration causes stress concentration and local fracture resulting in deteriorated strength of composites [16]. Another factor influencing the strength of composite is volume fraction of particulate in matrix [15].…”