Mechanical characterization and wear behavior of aerospace alloy AA2124 and micro B4C reinforced metal composites

Abstract

In the present investigation, the mechanical and wear properties of aerospace alloy AA2124-9 wt% of B4C composites were displayed. The composites containing 9 wt% of micro boron carbide in AA2124 alloy were synthesized by liquid metallurgy method through stir casting. For the composites, reinforcement particles were preheated to a temperature of 400℃ and afterward added in ventures of two stages into the vortex of liquid AA2124 alloy compound to improve the wettability and dispersion. Microstructural examination was carried out by SEM and elemental investigation was finished by EDS. Mechanical and wear properties of as cast AA2124 alloy and AA214-9 wt% of B4C composites were evaluated as per ASTM standards. Microstructural characterization by SEM and EDS confirmed the distribution and presence of micro boron carbide particles in the AA2124 alloy matrix. The hardness, ultimate strength, yield strength and bending behaviour of AA2124 alloy enhanced with the incorporation of 9 wt% of micro B4C particles. The hardness of as-cast AA2124 alloy was 65.76 BHN; it is 96.7 BHN in 9 wt% of B4C reinforced composites. The ultimate and yield strength of AA2124 alloy was 187.08 MPa and 150.33 MPa respectively. The enhanced UTS and YS in 9 wt% of B4C reinforced composites were 254.1 MPa and 203.7 MPa, respectively. Further, ductility of AA2124 alloy decreased with the presence of B4C particles. Wear resistance of aerospace alloy increased with the addition of micro particles. Tensile fractography and worn surface morphology were studied on the tested samples to know the various fractured and wear mechanisms.

Influence of SiO2 and nano graphene particles on the microstructure and mechanical behavior of A356 alloy metal composites

“…The presence of robust SiO2 particles, in conjunction with the finely dispersed Gr particles, significantly elevates the barriers to grain boundary sliding [41]. Additionally, an essential factor contributing to the overall enhancement in the composite's hardness, owing to the incorporation of SiO2, stems from an augmented dislocation density due to the thermal expansion mismatch between the reinforcement and the hybrid matrix at the particle-matrix interfaces [42]. The cumulative effect of these factors translates into formidable resistance against localized deformation during indentation.…”

A review on constituents, applications and processing methods of metal matrix composites

“…We will go into more detail about how carbides of various types are commonly utilized as reinforcements in metal matrices. The composite's qualities will be improved with the addition of reinforcements at a significantly lower cost than with the traditional monolithic material [30,31].…”