The effect of particulate loading on the mechanical behaviour of Al2O3/Al metal-matrix composites

Fabrication of Cement, Polymer, and Metal-Matrix Fibre Composites by Gravity-Assisted Liquid-Binder Infiltration: A Practical Approach

“…Typical SEM images ( Figure 7) taken on three points on the cut surfaces showed a fibrous microstructure (black/dark regions) within the aluminium alloy matrix (grey/white regions) at magnifications 50 µm and 125 µm, respectively. Similar results have been reported elsewhere [8,9]. Typical EDX spectrum obtained (Figure 8) taken on three points on the cut surfaces showed strong peaks characteristic of Mg, Al, and Si but Bi peak was absent.…”

“…A relationship was derived, based on experimental observations, between viscosity and setting time that enabled the time available for effective gravity-assisted infiltration to be determined. Developments in the area of fabrication of metal fibre composites include pressureless liquid-binder infiltration techniques for the fabrication of composites with a magnesium-containing aluminium alloy binder reported by Aghajanian et al [8,9] and Dwivedi et al [10]. The techniques developed employed preformed arrays of the fibres, contained within refractory vessels, infiltrated by the molten binder to identify, when possible, relationships between distance of infiltration and other process parameters.…”

Microstructure and mechanical properties of fly ash particle reinforced AA6061 composites produced by press and extrusion

“…They also reported that the tensile elastic modulus of the ash alloy increases with increase in fly ash fractions (up to 10wt %). Aghajanian et al have studied the Al 2 O 3 particle reinforced aluminum MMCs, with varying particulate percentages and reported improvement in elastic modulus, tensile strength, compressive strength and fracture properties with an increase in the reinforcement content [13]. Deuis et al showed that aluminum-silicon alloys and aluminum based metal matrix composites containing hard particles offer superior operating performance and resistance to wear [14].…”

Fracture of aluminium reinforced with densely packed ceramic particles: influence of matrix hardening

“…As a consequence, trends and limits in their properties are little-known or unclear. Their fracture toughness, like their tensile strength and ductility, has in the few investigations to date been found to be highly variable and strongly system-dependent, varying between 3 and roughly 20 MPa p m [6][7][8][9]. One general trend that is observed is that, as the particle diameter increases, the fracture toughness increases [7,[10][11][12][13][14].…”

“…One general trend that is observed is that, as the particle diameter increases, the fracture toughness increases [7,[10][11][12][13][14]. In one study of alumina-reinforced composites produced by capillarity-driven infiltration, it was also found that toughness, when expressed as a stressintensity factor, is relatively independent of particle volume fraction [9].…”