Investigating Mechanical Properties, Corrosion Resistance and Machining Characteristics of Al5083-Graphene Composites Pr
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ORIGINAL ARTICLE
Investigating Mechanical Properties, Corrosion Resistance and Machining Characteristics of Al5083-Graphene Composites Produced by Friction Stir Processing G. V. N. B. Prabhakar1,2 • Lingaraju Dumpala1 • N. Ravi Kumar3
Received: 25 May 2020 / Accepted: 28 September 2020 Ó The Indian Institute of Metals - IIM 2020
Abstract In the present work, Al5083-Graphene composite was successfully produced by friction stir processing (FSP). Appearance of texture in FSPed Al5083 with and without Graphene was clearly observed from the X-ray diffraction analysis. Increased hardness and tensile strength were measured for both the FSPed samples compared with the base alloy due to the grain refinement and additionally due to the presence of Graphene in the composite. However, the % of elongation of the composite was decreased compared with FSPed and base material. Machining studies from drilling experiments revealed higher cutting forces for FSPed Al5083 compared with the composite and base material. These results suggested that the presence of Graphene acted as solid lubricant which increased the machinability and decreased the cutting forces during drilling. Corrosion behavior assessed by electrochemical studies indicated decreased corrosion resistance for the composite compared with FSPed alloy, but was marginally improved compared with that of base material. The results demonstrated improved mechanical properties and better machinability of Al5083-Graphene composites. However, deteriorated corrosion resistance is an important concern must be considered, while developing Al5083-Graphene composite by FSP.
& G. V. N. B. Prabhakar [email protected] 1
Department of Mechanical Engineering, Jawaharlal Nehru Technological University Kakinada, Kakinada 533003, India
2
Department of Mechanical Engineering, V.K.R., V.N.B and A.G.K. College of Engineering, Gudivada 521301, India
3
Department of Mechanical Engineering, V. R. Siddhartha Engineering College, Vijayawada 520007, India
Keywords FSP Graphene Al5083 Composite Machinability Corrosion
1 Introduction Developing surface metal matrix composites (MMCs) by friction stir processing (FSP) is an attractive solid state route widely demonstrated in the recent scientific literature [1, 2]. FSP is a solid state process developed from the friction stir welding (FSW) to alter the surface microstructure. The material flow and grain refinement mechanisms during FSW and FSP have been explained in detail elsewhere [3]. Microstructure modification and addition of secondary phases in the form of reinforcement by FSP influence certain material properties of the composites [1, 4]. Several material systems such as aluminium, magnesium, copper, steels and titanium alloys have been used as matrix materials and TiO2, TiC, SiC, B4C, SiO2, Al2O3, carbon nanotubes (CNT), Graphene, metallic powders, hydroxyapatite, fly ash, etc., have been used as dispersing phases to develop surface composites by FSP [5, 6]. In order to fabricate structures and components in engineering
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