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 0 C of stirring temperature is sufficient for aluminium foaming.

Al and A356 Alloy Foam Castings Modified with Low Concentrations of Nano-Sized Particles: Structural Study and Compressive Strength Tests

“…In [31], the plastic collapse of an AA7075 alloy foam reinforced with micro-sized SiC and TiB2 is compared with an A356 alloy foam containing micro-sized SiC particles, which are, respectively, 25MPa and 5MPa (Figure 12b). Here, again, it was difficult to analyze the obtained results, because the alloys are different, as are the introduced micro-powders.…”

Analysis and Optimization of Process Parameters of Powder Mixed Near Dry- EDM by using Grey Relational Optimization

“…The setup's panel incorporates various key components, including a dielectric chamber for mixing, mist flow meter for a dielectric, manual regulators, and pressure gauges that play a crucial role in determining the working pressure of the dielectric medium. After that, the material removal rate is calculated according to Sundriyal s. discussed in literature survey 22,28 .…”

“…From Figure 9(b), which shows the effect of input parameters on Tool Wear Rate (TWR), it can be seen that a lower value of tool wear rate was observed when the mist of powder concentration increased on duty cycle, the pulse on time, and discharge current increased due to this. The tool's strong thermal conductivity and the workpiece materials low specific heat make for more effective TWR findings 11,28 . It was observed that the lower the tool wear rate in PM-EDM as compared to ND-EDM at input parameters of 4 g/l powder concentration, a pulse From Figure 11(a), which shows the effect of various inputs on surface roughness, it can be seen that when there are increases in discharge current, duty cycle, and pulse on time, a better surface of finish is achieved.…”

“…It was observed that the lower the tool wear rate in PM-EDM as compared to ND-EDM at input parameters of 4 g/l powder concentration, a pulse From Figure 11(a), which shows the effect of various inputs on surface roughness, it can be seen that when there are increases in discharge current, duty cycle, and pulse on time, a better surface of finish is achieved. The metallic powder played a major role in changing the spark gap, which improved surface quality 28,29 . Due to the lack of metallic powder, a maximum increase in surface quality of 16.36% was seen when comparing PMND-EDM to near-dry EDM.…”

Numerical Study on the Effect of Spinning for 7.62 APM2 Projectile Impacting on Al 7075-T651 Target

“…Aluminium alloys and their composites have a wide range of applications such as automobile structures, aerospace structures, and marine applications [15][16][17][18]. Al 7075-T651 alloy is one of the well-known Armour-grade aluminium alloys [19,20] because of its high strength and low weight properties.…”