Abstract
In the present study, Al-SiC-ZrO2 nanocomposites were developed and characterized. Towards this direction, the aluminum (Al) matrix was reinforced with nano-sized silicon carbide (SiC) and zirconium dioxide (ZrO2), and the mixture was blended using ball milling technique. The blended powder was compacted and sintered in a microwave sintering furnace at 550 °C with a heating rate of 10 °C/min and a dwell time of 30 min. The amount of SiC reinforcement was fixed to 5 wt.%, while the concentration of ZrO2 was varied from 3 to 9 wt.% to elucidate its effect on the microstructural and mechanical properties of the developed nanocomposites. Microstructural analysis revealed the presence and uniform distribution of reinforcements into the Al matrix without any significant agglomeration. The mechanical properties of Al-SiC-ZrO2 nanocomposites (microhardness and compressive strength) were observed to increase with the increase in the concentration of ZrO2 nanoparticles into the matrix. Al-SiC-ZrO2 nanocomposites containing 9 wt.% of ZrO2 nanoparticles demonstrated superior hardness (67 ± 4 Hv), yield strength (103 ± 5 MPa), and compressive strength (355 ± 5 MPa) when compared to pure Al and other compositions of the synthesized composites. Al-SiC-ZrO2 nanocomposites exhibited the shear mode of fracture under compression loadings, and the degree of deformation was restricted due to the work hardening effect. The appealing properties of Al-SiC-ZrO2 nanocomposites make them attractive for industrial applications.
Highlights
In recent years, active research has been in progress to overcome the limitations of monolithic materials and to develop cost-effective smart materials with promising properties to meet modern engineering and industrial requirements [1]
Al-based nanocomposites are a new class of composites comprised of a combination of one or more types of nano reinforcements incorporated into the Al matrix, enabling them to make use of the unique properties of individual contributing nano reinforcements [16]
The results confirm the presence of Al developed nanocomposites containing various concentrations of ZrO2
Summary
Active research has been in progress to overcome the limitations of monolithic materials and to develop cost-effective smart materials with promising properties to meet modern engineering and industrial requirements [1]. In such applications, aluminum metal matrix composites (AMMCs) are attractive due to their appealing properties such as their low density, high elastic modulus, excellent thermal stability, and wear resistance [2,3,4,5]. The favorable structural, thermal, mechanical, and multifunctional characteristics of nanocomposites have been well explored in many applications like automobile, aerospace, aeronautical, marine, and other engineering applications [23,24,25,26,27,28]
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