Role of ultrasonic treatment on microstructure, mechanical and tribological behavior of 2D boron nitride reinforced aluminum composites

Role of Ultrasonic Treatment on Microstructure, Multiscale Mechanical, and Tribological Behavior of 2D Tungsten Disulfide Reinforced Aluminum Composites

“…However, the increase from UST‐induced dispersion of WS 2 in Al 6061 is relatively low, an additional increment of only 2.5% in 45 s. This is in direct contrast to refinement efficiencies achieved in UST‐induced dispersion of 3D SiC [ 4 ] and 2D h‐BN. [ 6 ] In these composites, 35% and 45% refinements have been reported in Al 1100 in 60 s. The density of WS 2 , 7.5 gcm −3 , is significantly higher than those of SiC (3.2 gcm −3 ) [ 4 ] and h‐BN (2.1 gcm −3 ). [ 6 ] Thus, there is a progressive decrease in grain refinement efficiency with increased reinforcement density.…”

“…[ 6 ] In these composites, 35% and 45% refinements have been reported in Al 1100 in 60 s. The density of WS 2 , 7.5 gcm −3 , is significantly higher than those of SiC (3.2 gcm −3 ) [ 4 ] and h‐BN (2.1 gcm −3 ). [ 6 ] Thus, there is a progressive decrease in grain refinement efficiency with increased reinforcement density. It can be concluded that it is more difficult for the ultrasonic waves to disperse denser materials in similar metal matrices and UST durations.…”

“…As a result, the only 2D layered platelets used to reinforce composites by ultrasonic casting, hexagonal boron nitride (h‐BN), and graphene nanoplatelets (GNPs) constitute about 6% of the reported literature. [ 6,11–14 ]…”

“…This sole employment of h‐BN and GNPs during ultrasonic casting of 2D platelet reinforced metal matrix composites renders an additional limitation. The densities of h‐BN, 2.1 gcm −3 , [ 6 ] and GNP, 2.2 gcm −3 , [ 13,14 ] are comparable to that of aluminum (Al), 2.7 g cm −3 , and thus intermix easily with the molten metal. On the other hand, the intermixing behavior of 2D layered reinforcements heavier than Al is entirely unexplored.…”

The Wear Performance of Cu-Based Composites Reinforced with Boron Nitride Nanosheets

“…Third, BNNSs may become the origin source of cracks due to their medium bonding strength with the Cu matrix. Finally, agglomerated BNNSs can weaken the interfacial bonding between adjacent composite particles, making some composite particles easily peeled off [ 36 , 37 ]. In short, BNNSs may have both positive and negative effects on the wear resistance of CMCs.…”