Abstract
The machinability of graphene-reinforced magnesium-based hybrid nanocomposites produced through the application of powder metallurgy method has not been completely reported. This article presents an experimental investigation on the thrust force, the surface roughness (Ra), and drilled surfaces characteristics in the drilling process of a Mg/SiC/GNPs (magnesium matrix based silicon carbide and graphene nanoplatelets) hybrid magnesium matrix composite. The hybrid composite material was produced through the application of a powder metallurgy method. The experiments were carried out with uncoated, PVD (Physical Vapor Deposition), and CVD (Chemical Vapor Deposition) coated tungsten carbide drill bits at three levels of cutting speeds (30, 40, and 50 m/min), and three different levels of feed rate (0.10, 0.15, and 0.20 mm/rev) under dry machining conditions. Taguchi’s L27 (33) orthogonal array and S/N ratio were used to optimize the optimal parameters for thrust force and surface roughness. The experimental results indicated that the thrust force and the surface roughness were extremely dependent on a particular type of drill bits, feed rate, and cutting speed. The feed rate parameter is known to have a significant influence on the surface finish.
Highlights
IntroductionMetal matrix composites (MMCs) are mainly used in a large domain due to their excellent properties (properties-to-weight) of strength and stiffness compared to monolithic metals, and they show some capable degree of latency for novel products proposed and produced [1,2,3,4,5]
Metal matrix composites (MMCs) are mainly used in a large domain due to their excellent properties of strength and stiffness compared to monolithic metals, and they show some capable degree of latency for novel products proposed and produced [1,2,3,4,5]
The results indicated that the increase of the cutting speed reduce the surface roughness, whereas the increase of the feed rate increases the surface roughness, and they reported that the feed rate is the factor which extremely influences the surface finish in the drilling of hybrid MMCs
Summary
Metal matrix composites (MMCs) are mainly used in a large domain due to their excellent properties (properties-to-weight) of strength and stiffness compared to monolithic metals, and they show some capable degree of latency for novel products proposed and produced [1,2,3,4,5]. MMCs are anisotropic, non-homogeneous materials and reinforced with abrasive reinforcements. This formulates hard materials to cut/machine [6,7]. Magnesium is lighter than aluminum, titanium, and stainless steels by 33%, 61%, and 77%, respectively [4,8]. Mg MMC presents several advantages compared to Mg metal or its alloys, such as a high modulus of elasticity, high strength, and excellent creep properties [6,8,9]. The reinforced materials mainly used are SiC (silicon carbide), TiC (titanium carbide), Al2 O3 (aluminum oxide), B4 C (boron carbide), CNTs (carbon nano-tubes), and the new graphene nano-platelets (GNPs) [9,10,11]
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