Effect of ball-milling time on mechanical properties of carbon nanotubes reinforced aluminum matrix composites

Investigation of different carbon nanotube reinforcements for fabricating bulk AlMg5 matrix nanocomposites

“…Liu et al also showed that prolonged milling time leads to destruction of CNTs. They confirmed this with Raman spectroscopy, showing that the integrated intensity ratio between the G-(graphite) and D-line (defects) of carbon (I G /I D ) decreases with increasing milling time [9]. Furthermore the authors observed that the improvement of the dispersion uniformity was not obvious after increasing milling time over an optimum, however CNTs damage became more evident.…”

“…The shortened CNTs are then easily dispersed into the matrix. The shortening and damaging of CNTs during the milling process have been already reported by other authors [8,9]. Beside the dispersion, the high energy milling has another primordial effect for explaining the composites strengthening.…”

“…The fact that short milling times lead to a poor mechanical strength could be explained by the combination of flaky shapes, softer particles and probably a poor CNT dispersion. Liu et al also reported that short milling time or low milling energies lead to a covering of the aluminium particles with CNTs and longer times (higher energy) are required to embed the CNTs into the matrix particles [9].…”

Microstructure, electrical conductivity and hardness of multilayer graphene/Copper nanocomposites synthesized by flake powder metallurgy

“…According to their results, mechanical milling can offer a homogeneous distribution for low reinforcement content. However, the high degree of work deformation reduces the ductility of the matrix material, and the compressibility of alloy and composite powders decreases due to the increase in hardening during the mechanical milling process [20][21][22]. Therefore, it is essential to develop an easy and effective way to achieve a uniform mixing of reinforcement particles in the matrix, which will enable an adequate deformation capacity of the powder compacts.…”

A novel approach to prepare aluminium-alloy foams reinforced by carbon-nanotubes

“…But, incorporating CNTs in metal-matrices is rather difficult due to several reasons, such as their high tendency to agglomerate into clusters, their poor dispersion ability in the metal-matrix, poor wettability of carbon by molten metal due to a large difference of surface tensions and the formation of an interfacial reaction product [6,7]. Great efforts have been carried out by researchers for achieving uniform dispersion of CNTs in the metal-matrix using various processing strategies, mainly based on PM-method [6,7,9,10]. The results have shown that better dispersion of these reinforcement elements in the metal powder can be achieved using high-energy mixing process (e.g.…”