Effect of carbon nanotube content and double-pressing double-sintering method on the tensile strength and bending strength behavior of carbon nanotube-reinforced aluminum composites

Abstract

Abstract

Microstructure and properties of ZrB2-reinforced aluminum matrix composites consolidated by ECAP process

“…In other words, a decrease in grain boundaries could have been happen. This confirms the occurrence of dynamic recovery at times longer than 18 h of mechanical alloying [12,14,15,[45][46][47][48][49][50].…”

Synthesis of Cu-CNTs nanocomposites via double pressing double sintering method

“…To fully understand the strengthening mechanisms that take place in the Cu-based nanocomposites reinforced with nano-fibers (MWCNTs), additional work is required. Nevertheless, we should consider the following hypotheses: (i) inhibition of dislocation motion by MWCNTs, (ii) thermal mismatch between MWCNTs and Cu, (iii) formation of a transition layer between the MWCNTs and the Cu matrix, (iv) grain refining produced by MM process, and (v) formation (crystallization) of Cu2O [38]. Orowon strengthening, grain, and substructure strengthening, quench hardening resulting from the dislocations generated to accommodate the differential thermal contraction between the reinforcing particles and matrix, and work hardening due to the strain misfit between the elastic reinforcing particles and the particle matrix is also the possible strengthening mechanisms, which may operate simultaneously leading to increased hardness and elastic modulus of the particle-reinforced metal matrix composites [38].…”

“…Nevertheless, we should consider the following hypotheses: (i) inhibition of dislocation motion by MWCNTs, (ii) thermal mismatch between MWCNTs and Cu, (iii) formation of a transition layer between the MWCNTs and the Cu matrix, (iv) grain refining produced by MM process, and (v) formation (crystallization) of Cu2O [38]. Orowon strengthening, grain, and substructure strengthening, quench hardening resulting from the dislocations generated to accommodate the differential thermal contraction between the reinforcing particles and matrix, and work hardening due to the strain misfit between the elastic reinforcing particles and the particle matrix is also the possible strengthening mechanisms, which may operate simultaneously leading to increased hardness and elastic modulus of the particle-reinforced metal matrix composites [38]. Although improvement in mechanical properties is under influence of aforementioned strengthened mechanisms, inhibition of dislocation motion by CNTs and increasing of dislocation density produced by MM process of powders [36] and thermal mismatch between CNTs and Cu could be effective mechanisms to improve mechanical properties in this research work.…”

“…Although improvement in mechanical properties is under influence of aforementioned strengthened mechanisms, inhibition of dislocation motion by CNTs and increasing of dislocation density produced by MM process of powders [36] and thermal mismatch between CNTs and Cu could be effective mechanisms to improve mechanical properties in this research work. It is noteworthy to mention that other researchers have performed some research to investigate the significant effect of second pressing and sintering on a metal matrix which led to considerable enhancement of mechanical properties [28,38,39].…”