Evaluation of the Mechanical Properties of AA 6063 Processed by Severe Plastic Deformation
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UCTION
ALUMINUM alloy 6063 (AA 6063) is widely used in different industrial fields such as construction and transportation due to its acceptable formability, proper weldability, and corrosion resistance. However, the mechanical properties of this alloy such as hardness, tensile strength, fatigue life, and fretting fatigue behavior are not appreciable.[1] Fretting is a contact damage process that occurs when fatigue load is imposed on a component, while it is in contact with an adjacent component. This phenomenon leads to oscillatory microslipping at the components’ surfaces, which actuates the existing crack nucleation
DAVOUD MASHHADI JAFARLOU, Researcher, ERFAN ZALNEZHAD and NOOR AZIZI BIN MARDI, Senior Lecturers, are with the Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia, and also with the Centre of Advanced Manufacturing & Material Processing (AMMP), 50603 Kuala Lumpur, Malaysia. Contact e-mail: [email protected] ABDELMAGID SALEM HAMOUDA, Professor, is with the Mechanical and Industrial Engineering Department, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar. GHADER FARAJI, Assistant Professor, is with the School of Mechanical Engineering, College of Engineering, University of Tehran, 11155-4563 Tehran, Iran. MOHSEN ABDELNAEIM HASSAN MOHAMED, Associate Professor, is with the Department of Mechanical Engineering, Faculty of Engineering, University of Malaya and Centre of Advanced Manufacturing & Material Processing (AMMP), and also with the Department of Mechanical Engineering, Faculty of Engineering, Assiut University, Assiut 71516, Egypt. Manuscript submitted July 9, 2014. METALLURGICAL AND MATERIALS TRANSACTIONS A
and eventually leads to unanticipated structure failure.[2,3] A traditional fretting fatigue improvement strategy is coating as a surface modification method in industrial applications wherever contact parts are subjected to small amplitude relative motion as a result of vibration or cyclic loads. The effects of hard and soft coatings on fretting fatigue behavior have been studied broadly.[4] In order to reduce the detrimental effect of fretting fatigue, hard anodizing (HA) is extensively applied in industry as an efficient coating technique. In addition, HA coating significantly increases surface hardness and corrosion resistance, and further simultaneously serves decorative purposes.[5] The other technique for improving the mechanical properties of metallic materials is to decrease the metal grain size by subjecting them to severe shear plastic deformation (SPD). Bulk materials with ultrafine grains (UFGs) processed with SPD have attracted great interest in the industrial field for their unique mechanical properties. The major role of the SPD process is the imposition of ultra-large shear plastic strain into the material structure to convert coarse-grained (CG) structure into UFG structure.[6] Various types of SPD techniques such as equal channel angular pressing (ECAP),[7] high-pressure torsion (HPT),[8] accumulative roll
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