Mississippi State University
Date of Degree
Original embargo terms
Complete embargo for 2 years
Graduate Thesis - Open Access
Master of Science
James Worth Bagley College of Engineering
Department of Mechanical Engineering
Additive friction stir deposition is characterized by rotating a consumable feedstock rod that induces severe plastic deformation to deposit material additively without raising the material past its melting point. In this way, additive friction stir deposition differs from traditional additive manufacturing, and new developments in this technology require further investigation of build parameters, tooling, and resultant builds to better understand this printing process and its applications. This thesis evaluated the effect of rotational speed on aluminum 6061 builds using mechanical testing and microstructural investigations. Three different build conditions were evaluated at 180 RPM, 240 RPM, and 300 RPM. Mechanical testing methods were used to determine hardness values, ultimate tensile strength, yield strength, elastic modulus, and density. Imaging techniques including optical microscopy, electron backscatter diffraction, energy dispersive x-ray spectroscopy, and x-ray computed tomography were used to evaluate microstructure, grain size, chemical composition, and porosity.
This material is based upon work supported by the U.S. Army Engineer Research and Development Center (ERDC) under contract W912HZ-19-C-0036. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of ERDC or the U.S. Government. Distribution Statement A: Approved for public release; distribution unlimited.
McCabe, Emily Margaret, "Evaluation of the effects of rotational speed on microstructural and mechanical properties of additive friction stir deposited aluminum 6061" (2021). Theses and Dissertations. 5209.
Available for download on Tuesday, August 15, 2023