Nanoparticles Distribution and Mechanical Properties of Aluminum-Matrix Nano-Composites Treated with External Fields

Influence of Combined Helical and Pass Rolling on Structure and Residual Porosity of an AA6082-0.2 wt % Al2O3 Composite Produced by Casting with Ultrasonic Processing

“…In Figure 2b, the contrast caused by the alumina particles can be seen near the grain boundaries. The number of pores in this case is considerably higher than in the matrix alloy particles, and as a rule, they are surrounded by agglomerates of particles, which is rather typical for nanocomposites [6]. The measured density of the cast materials showed (Table 1) that the alloy approached the density of pure aluminium (99.8%), while the density of the composite was significantly lower (2.655 g/cm 3 ), which is approximately 98% of the aluminium density (2.7 g/cm 3 ).…”

“…In Figure 2b, the contrast caused by the alumina particles can be seen near the grain boundaries. The number of pores in this case is considerably higher than in the matrix alloy particles, and as a rule, they are surrounded by agglomerates of particles, which is rather typical for nanocomposites [6]. The density was measured by hydrostatic weighing on an analytical scales RADWAG XA 110 (RADWAG, Radom, Poland) with an accuracy of 1 × 10 −4 g. Microhardness was measured using a Duramin-5 micro hardness tester with a load on the indenter of 25 g and a minimum of 20 indentations.…”

“…As a result, a reduced density is observed in composites due to the residual porosity, decreasing their mechanical characteristics [6]. There are several solutions to the problem: applying coatings on the particles that increase wettability, using master alloys, and/or imposing external fields on the metallic melt [3][4][5][6][7]. In this study, a specially prepared master alloy as well as ultrasonic treatment of the melt was used.…”

Coupling of Acoustic Cavitation with Dem-Based Particle Solvers for Modeling De-agglomeration of Particle Clusters in Liquid Metals

“…Equations [2] and [3] are solved using a high-order staggered finite difference method. [17] Spatial derivatives are evaluated on a 6-point stencil, with mirroring of variables at solid boundaries.…”

“…Another study indicated a slight enhancement in Brinell hardness of aluminum, magnesium, and copper-based MMNCs with Al 2 O 3 and AlN nanoparticles. [2] The study suggested that a better dispersion of nanoparticles is needed. Other researchers also report agglomerations of nanoparticles made visible using high-definition scanning electron microscopy (SEM).…”