Effect of SiC particle size and weight % on mechanical properties of AA7075 SiC composite
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ORIGINAL RESEARCH
Effect of SiC particle size and weight % on mechanical properties of AA7075 SiC composite Rajesh Kumar Bhushan 1 Received: 21 May 2020 / Revised: 21 July 2020 / Accepted: 2 September 2020 # Springer Nature Switzerland AG 2020
Abstract Metal matrix composites (MMCs) possess high specific strengths and resistance to wear and deformation. Because of these properties, they are needed for automotive and aerospace uses. SiC-reinforced MMCs show good prospective for these uses, but their greater use is hindered by inadequate ductility and fabrication problems. These issues need to be resolved. AA7075 was provided with 10 wt.% and 15 wt.% SiC particle size of 10–20 μm and 20–40 μm by stir casting technique. Composite casting was fabricated. Samples were prepared from these castings. Samples were examined utilizing scanning electron microscopy (SEM) and energy-dispersive X-ray analyses (EDAX). SiC particle distribution and interaction with AA7075 matrix was studied. Change in hardness and tensile strength due to addition of different wt.% and particle size of SiC particles was also investigated. Microstructures of all four types of AA7075/SiCp composite exhibited uniform SiCp dispersal into AA7075. Hardness enhanced by 10.48% with rise of SiC reinforcement from 5 to 15%. Maximum improvement (9.67%) in tensile strength was seen with the addition of 10 wt.% SiC (10–20 μm) particles. AA7075/SiCp composites will be used in industrial applications requiring high tensile strength along with wear resistance. Keywords 7075 Al alloy . SiC . Composite . SEM . EDAX . Hardness . Tensile strength
1 Introduction Engineering applications need metal matrix composites (MMCs) due to their superior physical and mechanical properties. Current focus of research is on MMCs due to their scientific and technological benefits. MMCs with particulates as reinforcement are comparatively less expensive and have isotropic properties when equated to fiber-reinforced MMCs. Boron, silicon nitride, boron nitride, silicon carbide, titanium carbide, and alumina are available as particle reinforcements, but research is focused on development of silicon carbide (SiC) reinforcement. SiC-reinforced composites are favored as they have superior refractoriness and high resistance to abrasion and thermal stress in comparison with composites reinforced with different category of reinforcements. Angers et al. [1] observed that composites having up to 25 vol.% SiCp showed better mechanical properties and consistent spreading of reinforcement particulates but their ductility reduces with
* Rajesh Kumar Bhushan [email protected] 1
Department of Mechanical Engineering, National Institute of Technology Manipur, Imphal, Manipur, India
amount of SiCp. Bonding between AA2024 and SiC particles was found durable. Knowles et al. [2] formed nanoparticlereinforced AA6061 composites through powder metallurgy route. Composite displayed better strength and Young’s modulus together with superior ductility and low density. Amouri et al. [3] fabricated A356-nano
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