Reinforcement with carbon nanotubes in aluminum matrix composites

Analysis of Lightweight Materials for the AM2 System

“…Researchers hypothesized the cause of this observation was that the smaller grain size placed less tensile stress on the CNT fiber and increased the shear stress loaded perpendicular to the fiber's length, as shown in Figure 27 (Choi et al 2008). Therefore, as the material became more dependent on the integrity of the CNT for its strength, the small grain structure began to fracture the CNT fibers.…”

“…The manufacturing of CNTs is still very difficult and, in most techniques, exhibits a low production volume, which is not very applicable for manufacturing of the AM2. Tensile (top chart) and Shear Stress (bottom chart) for ultra-fine grain (c) and nanoscale grain (d) aluminum MMC (Choi et al 2008). …”

Plasma And Cold Sprayed Aluminum Carbon Nanotube Composites: Quantification Of Nanotube Distribution And Multi-Scale Mechanical Properties

“…Various processing routes like casting [23][24][25], hot pressing [26][27][28], extrusion [29][30][31] and thermal spraying [32][33][34][35] employ high temperatures which may cause damage to the CNT structure. Successful retention of CNTs during high temperature processes like plasma spraying and high velocity oxy-fuel spraying has been reported by our group in several previous works [32,35].…”

“…However, the approach was mainly confined to Cu-CNT [41,71,[77][78][79][80] and Al-CNT [29,30,[81][82][83][84][85][86] composites. Kuzumaki et al [29] have synthesized Al-CNT composite through hot extrusion of powder compacts, at 873K.…”

“…Compacts processed by hot extrusion, rolling, ECAP Cu-CNT [41,67,[77][78][79][80] Al-CNT [29,30,[81][82][83][84][85][86] Mg-CNT [90,180] 100% increase in tensile strength in hot extruded Al-10vol.% CNT [29] 71% reduction in wear loss in (sintered + rolled) Cu-12vol.% CNT [80] 15% increase in yield strength in (sintered + hot extruded) Mg 0.3wt.% CNT [87] Casting Pre-alloyed powders melt and cast…”