Stir casted SiC-Gr/Al6061 hybrid composite tribological and mechanical properties
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Stir casted SiC‑Gr/Al6061 hybrid composite tribological and mechanical properties Ibrahim Sabry1 · M. Abdel Ghafaar1 · Abdel‑Hamid Ismail Mourad2,3 · Amir Hussain Idrisi2 Received: 3 February 2020 / Accepted: 7 April 2020 © Springer Nature Switzerland AG 2020
Abstract The improvement in the mechanical properties of composites is always an essential requirement for technological development. In this work, hybrid aluminum matrix composites fabricated using the stir casting technique. Silicon carbide and graphite used as reinforcement to improve the mechanical properties. AMCs produced by adding various volume fraction of SiC (5%, 10% and 15%) whereas fixed volume fraction (10%) of the graphite used in composites. The fabricated AMC samples were tested to determine the tensile strength, hardness and wear rate. The wear rate was deter‑ mined under the different loads (10 N, 20 N, 30 N and 40 N) and sliding velocities (0.4 m/s, 0.8 m/s, 1.2 m/s and 1.6 m/s). Mechanical properties of fabricated AMCs are evaluated and compared with Al6061 alloy. The results discovered that the tensile strength and hardness increased from 490 to 710 MPa and 65VHN to 85VHN respectively with the addition of silicon carbide and graphite particles. The wear rate also increased with the increase of applied load. However, for sliding velocity it surges till 1.2 m/s then decreased steeply. Keywords Aluminum matrix composites · Graphite and silicon carbide reinforcement · Stir casting · Wear testing
1 Introduction Aluminum matrix composites (AMCs) are engineering materials having useful characteristics such as high ten‑ sile strength, compressive strength, hardness and stiffness. These materials have better abrasive resistance compared to unreinforced alloys. These materials are being utilized in various structural implementation in several industries such as marine, aerospace, automobile etc. [1, 2]. Al 6061 is most utilized matrix material because of its low density, high strength, low electrical resistance, high corrosion resistance and higher machinable properties. However, lower wear resistance has restricted its application. The mechanical and tribological characteristics of both particulate and fiber reinforced Al 6061composite have improved significantly in recent years. Abdullah et al. [3]
investigated that the tensile strength and hardness of alu‑ minum improved with the increase of SiC particles, but the plasticity and malleability of the composites decrease sig‑ nificantly. Idrisi et al. [4] fabricated AMC reinforced with a different fraction of SiC particles using traditional stir cast‑ ing and ultrasonic vibration based stir casting process. They observed significant increase in density, tensile strength, hardness and compressive strength of the AMCs devel‑ oped through ultrasonic stir casting route. The stir casting method allows uniform dispersion of reinforcement to the base material and scattering of the agglomeration and reduces the crack like [5–15] flows which affects the physi‑ cal and mechanical behavior of the composi
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