Development and characterization of Aluminium AA7075 hybrid composite foams (AHCFs) using SiC and TiB2 Reinforcement

Abstract

In this study AA7075/SiC/TiB2 closed-cell Aluminium hybrid composite foam (AHCFs) with different densities was fabricated by top-loaded bottom pouring stir casting technique. This technique uses oyster-shell powders (CaCO3 2.5 wt. % of composite with 60 μm size) as blowing agents and no viscosity-enhancing ingredient. The silicon carbide (SiC 0, 3, 6, 9, and 12 wt. % with 25 μm) and titanium di-boride (TiB2 3 wt. % with particle size 15 μm) are used as primary and secondary reinforcement agents. It has been noted that the addition of TiB2 and SiC enhanced the mechanical properties (modulus of elasticity, yield strength, and plateau strength) of AHCFs. The energy absorption capacity of AHCFs increases with the addition of SiC up to 3 wt. % and a further increase in SiC content leads to the reduction. It is observed that density and cell wall thickness increases with increasing the wt. % of SiC and Cell size and porosity decrease with an increase in wt. %. of reinforcement. It is also noted that Stirring temperature also strongly influenced the microstructural properties of AHCFs, and 750 0C of stirring temperature is sufficient for aluminium foaming.

Investigation and Optimization on Parameters of Gas Additive Powder Mixed Near Dry –EDM (GAPMNDEDM) by using Taguchi based- Grey Relational Optimization

“…The desirable properties of graphite play a crucial role in achieving a high-quality surface finish. Graphite's effective lubrication and low resistivity, in contrast to aluminum and zinc, result in a well-defined microstructure and a more favorable impact on the wetting of powder particles by the molten machine surface 25 . This, in turn, leads to the creation of a smoothly machined surface, as depicted in Figure 10(a).…”

Effect of Reinforcement on Micro Structural and Compressive Deformation Behavior on Closed Cell AA7075 Aluminium Foam

“…its low weight, high explicit stiffness, outstanding strength-to-weight ratios and significantly improved energy absorption capacities [7][8][9] . The metal aluminium foam is regarded as a substance that is solid at low pressure but behaves like a liquid under high pressure [10][11][12] . The powder metallurgy method can also be used to make aluminium metal foams.…”