The effect of reinforcement content and milling time on microstructure and mechanical properties of Al–10Mg/xAl2O3 nanocomposites

Mechanical and wear performance of A356/Al2O3 aluminum nanocomposites by considering the mechanical milling time and microstructural properties

“…In other words, nanocomposite powders undergo more deformation with the increase in milling time leads to an increase in hardness and compressive strength. The second, which is valid for nanocomposites MM'ed for 4 h is that the decrease in particle size due to MM strengthen the nanocomposites by well-known grain-boundary strengthening (Hall-Petch) mechanism (Safari et al, 2013;Tiku et al, 2020). However, considering the particle size results given in Figure 1(a), it is observed that the hardness of nanocomposites MM'ed for 2 h increased as close as the nanocomposites which has smaller particles (nanocomposites MM'ed for 1 h).…”

“…The density of the nanocomposites decreases almost linearly with an increase in MM time, whereas particle size increases interruptedly with a decrease at higher MM time, as seen in Figure 1(a). Powders subjected to excessive plastic deformation during high-energy milling undergo deformation hardening, which makes shaping them challenging during cold pressing (Safari et al , 2013). The compressibility of composite powders decreased with an increase in MM time in a previous study (Rahimian et al , 2010), restricting the packaging of green compacts and increasing the amount of pore while decreasing the density.…”

“…The powder size increases because of cold welding and decreases due to fracturing (Safari et al, 2013). Deformation during the MM process leads to complexshaped particles with increased surface area, resulting in higher porosity.…”

“…The addition of hard reinforcement particles positively affects the mechanical properties. Studies also examine the effects of MM time on the final powder size and the mechanical properties of the produced material (Akhlaghi et al , 2017; Safari et al , 2013). The reduction in the reinforcement particle size by MM, increases the hardness and strength of the composites and minimizes the loss in ductility (Rahimian et al , 2010).…”

Role of Different Fractions of Nano-size SiC and Milling Time on the Microstructure and Mechanical Properties of Al–SiC Nanocomposites

“…This is accompanied by a reduction in overall Trans Indian Inst Met dislocation density by annihilation at grain boundaries [18] (dynamic recovery), which leads to a rigorous decline in increasing rate of microstrain. Also, temperature rise effect brings about static recovery and strain relaxation [12,20,25]. However, further rise in microstrain is a result of introduction of more SiC nanoparticles into the matrix and its subsequent effects such as hindering of dislocations' movements.…”