Sol–gel coated B₄C particles reinforced 2024 Al matrix composites

Abstract

In this study, mechanical and wear properties of unreinforced 2024 Al alloy and composites with different vol.% of coated and uncoated boron carbide particles were experimentally investigated. It is seen that incorporation of hard particles to 2024 aluminium alloy contributes to the improvement of the mechanical properties and wear resistance of the base alloy to a great extent. Hard particles take part in resisting penetration, cutting, and grinding by the abrasive and protect the surface. It is noted that the increase in the weight fraction of B4C particles improves the wear resistance of the composites. Based on the weight loss data, composites with 30 vol.% B4C particles have the highest wear resistance among all the tested samples and unreinforced aluminium alloys give the lowest wear resistance. The results show that TiB2 coating of the B4C particles improved the mechanical properties. It is observed that the weight losses of the coated composites are less than those of the composites without coating.

Abrasive wear behavior of various reinforced AA6061 matrix composites produced with hot pressing process: A comparative study

“…The highest surface roughness was obtained for the as-received sample, Figure 9. This high surface roughness can be attributed to lower hardness [33][34][35][36][37][38][39][40]. The hardness of the AA6061 alloy is increased with the addition of all reinforcement's material, Table 3.…”

“…Boron carbide is one of the important reinforcing materials used in aluminum based matrix composites [28][29][30][31][32][33][34][35][36][37][38][39][40]. Boron carbide volume fraction is generally below 15 % in the metal matrix composite [32][33][34][35][36][37][38][39][40]. Addition of boron carbide is limited because aluminum and boron carbide has poor wetting ability.…”

Mechanical Properties as a Function of Casting Process of Aluminum–Silicon Alloy Matrix Composites

“…Here σ grain is the contribution of the grains to the yield stress, σ 0 is the friction coefficient, d is the diameter of the grain and k is constant [44,45].…”

Surface chemistry modification for elimination of hydrophilic Al4C3 in B4C/Al composites

“…The variety of routes used for production of Al-MMCs is ample, including powder metallurgy, spray deposition, mixing, diffusion bonding, stir casting, squeeze casting, compo casting, mechanical alloying as well as liquid metal infiltration [8,[12][13][14][15]. The latter route can be carried out in two modes, namely, pressure-assisted infiltration and pressureless infiltration.…”

“…Consequently, a variety of methods have been proposed to enhance wettability, such as surface coating of the reinforcements (Ti-compounds), use of inert or reactive gases, surface active elements, adding alloying elements and increasing the metal liquid temperature [12][13][14][15]. Although the propensity for high levels of porosity can be consequence of a lack of a good wettability of the ceramic by the aluminum alloy, it can be overcome by an adequate optimization study [18][19].…”