Deposition of AA5083-H112 Over AA2024-T3 by friction surfacing

Abstract

Friction surfacing (FS) is an advanced solid state process in surface modification with increasing applications in reclaiming worn parts, hardfacing and corrosion protection. The advantages of the process are that materials are deposited in the solid state and the resultant forged microstructure which leads to enhanced mechanical properties. As no melting takes place, the process allows joining of dissimilar materials while avoiding several fusion related problems. The present study addresses the deposition of AA5083-H112 coatings over AA2024-T3 substrates focusing on the influence of the main process parameters such as axial force, rotational speed and deposition speed, in the mechanical properties of the deposits. A performance and geometric analysis of the depositions are also presented. Sound aluminum coatings were produced; plastic deformation and heat generation promotes a dynamic recrystallization of the anisotropic consumable rod, resulting in a fine and homogeneous deposit. The coating presented an increase in ultimate tensile strength and failure deformation of 9% and 6%, respectively. Deposition efficiency between 25 and 50% were obtained, with a maximum of 48% average efficiency observed with 800 RPM, 12 kN and 16 mm/s.