Degree
Doctor of Philosophy (PhD)
Department
Mechanical and Industrial Engineering
Document Type
Dissertation
Abstract
In the past few years, Additive Manufacturing (AM) has attracted significant attention as a part of Industry 4.0. Additive Friction Stir Deposition (AFSD), as a branch of it, has been playing a critical role because of its ability to fabricate large parts via frictional heat and plastic deformation without the adverse effects of melting in open-air environments. These advantages have led AFSD to become extremely valuable to industry sectors such as aerospace, energy, and automotive. In this study, the characteristics of AA6061-T6511 using the AFSD technique by using the MELD-L3 machine have been investigated. The primary objective of this project was to explore the feasibility of fabricating AA6061-T6511 parts, visually defect free with minimum wastes, by MELD-L3 machine at a high deposition rate and eliminating graphite coating. After that step, tensile, microhardness, microstructure analysis, and corrosion resistance were carried out to investigate the performance of As Deposited (AD) and Heat Treated (HT) parts, both with Graphite (WG) and No Graphite (NG) coating. Total of 8 blocks with 2 mm layer thickness were fabricated under the same printing parameters of 300 RPM spindle speed, 26.4 in/min of feed rate, and 24 in/min of traverse speed. Half of the blocks were dedicated to exploring the effect of graphite coating. In this study, to statistically enrich and attain as comprehensive results as possible, numerous samples were extracted in variety of locations and orientations from each block. Tensile samples were extracted in both horizontal and vertical orientations. Microhardness, microstructure analysis, and corrosion resistance specimens were extracted in a way to explore the effect of AFSD in vertical direction. Finally, this study will make recommendations for future research directions in the scope of AFSD at high deposition rates.
Date
1-15-2026
Recommended Citation
Talachian, Michael M., "CHARACTERIZATION OF AA6061-T6 3D PRINTED BY ADDITIVE FRICTION STIR DEPOSITION AT HIGH DEPOSITION RATE - MATERIAL AND PROCESS" (2026). LSU Doctoral Dissertations. 6985.
https://repository.lsu.edu/gradschool_dissertations/6985
Committee Chair
Prof. Shengmin Guo