The effects of mechanical alloying on the compressibility of aluminium matrix composite powder

Modeling of the Prediction of Densification Behavior of Powder Metallurgy Al–Cu–Mg/B4C Composites Using Artificial Neural Networks

“…When the relative size of B 4 C particles decreases, it is more difficult for the soft matrix to fill the voids between the hard particles. These results have been observed in previous investigations [19,23,29].…”

“…In an ideal model of the spherical and equiaxed particles, symmetrical opposite forces appeared in the contact points, which promoted the compressive deformation of the particles. The irregular morphology of the particle propitiated the formation of asymmetrically opposite forces in the contact points between the particles, which resulted in shear deformation decreasing in the compaction pressure for powder packing [29,30]. It is known that the compaction mechanism of the powders in a rigid die is usually considered in three stages including (1) sliding and rearrangement of the particles; (2) elastic deformation of ductile powders and fragmentation of brittle solids; (3) plastic deformation of bulk compacted powders.…”

Fabrication and properties of mechanically milled alumina/aluminum nanocomposites

“…pictures from the thin film sample prepared by FIB where a large number of cavities are visible at the Al 2 O 3 /Al interface. Mechanical milling reduces the compressibility of the powders due to work hardening occurring during milling [34]. Also, Al 2 O 3 particles act as barriers that slow down the diffusion process required for proper sintering [35].…”

Influence of Alumina (Al2O3) Nanosized Reinforcements on Dimensional Stability of Pure Aluminum Matrix Nanocomposite

“…Reinforcement's particle size plays an important role in the formability of aluminum matrix. Theyact like a barrier against aluminum flow [2]. It is also reported that the weight loss of the composites in corrosive media depends strongly on both volume percent and particle size [3][4][5][6].…”