Abstract
The response of two different types of aluminium matrix composites (AMCs) reinforced with silicon carbide ceramic particulates or nickel metallic particulates to hot compression testing parameters was evaluated. The composites were produced via two-step stir-casting technique. Axisymmetric compression testing was performed on the samples at different deformation temperatures of 220 and 370 °Ϲ, 0.5 and 5 s−1 strain rates and total strains of 0.6 and 1.2. The initial and post-deformed microstructures were studied using optical and scanning electron microscopy. The results show that flow stress was significantly influenced by imposed deformation parameters and the type of reinforcements used in the AMCs. Nickel particulate reinforced aluminium matrix composite (AMC) showed superior resistance to deformation in comparison with silicon carbide reinforced AMC under the different testing conditions. In both AMCs, work hardening, dynamic recovery and dynamic recrystallisation influenced their response to imposed parameters. The signature of dynamic recrystallisation was very apparent in aluminium matrix composite reinforced with nickel particulates.
Highlights
Over the last two decades, aluminium matrix composites have taken the lead among other metal matrix composites within various domains of applications but have replaced a number of traditional alloys in different applications in the automotive industries [1,2]
To establish the factors that are responsible for higher hot compressive strength in Ni reinforced aluminium matrix composites (AMCs) over SiC reinforced AMCs, the microstructural changes that occurred during deformation was evaluated
The comparison between the high temperature compression strength, flow behavior and microstructural evolution of AA6063-SiCp and AA6063-Nip composites were evaluated under different deformation temperatures, strain rate and strain
Summary
Over the last two decades, aluminium matrix composites have taken the lead among other metal matrix composites within various domains of applications but have replaced a number of traditional alloys in different applications in the automotive industries [1,2]. It is evident from this review that the idea of using metallic and metallic glasses as reinforcements in AMCs is attracting several research interests especially with the sudden increase in the number of published articles in this area Common metallic reinforcements such as particulates of iron, nickel, machined steel chips among others have reportedly improved ductility levels in this new class of AMCs and this trend was attributed to the inherent ductile nature of those metallic particles and the improved wettability between the metallic reinforcements and the metal matrices [29,30,31,32]. The response of metallic reinforced aluminium composites to different strain rates and deformation temperatures will provide insights into their integrity under high temperature conditions These insights will be useful in ranking the composites as suitable material for application where damping capacity and high temperature strength are crucial. The response of this composite is compared with AMC reinforced with conventional silicon carbide particulates
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