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Title page for ETD etd-07302008-205305


Type of Document Master's Thesis
Author Prater, Tracie Joy
Author's Email Address tracie.j.prater@vanderbilt.edu
URN etd-07302008-205305
Title An Investigation into the Friction Stir Welding of Al 6061 and Al 6061/SiC/17.5p using Diamond Coatings
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Dr. Alvin Strauss Committee Chair
Dr. George E. Cook Committee Member
Keywords
  • Diamond thin films -- Industrial applications
  • Metallic composites -- Fatigue -- Testing
  • diamond coatings
  • Friction stir welding
  • Metal Matrix Composites
  • Aluminum -- Fatigue -- Testing
Date of Defense 2008-08-08
Availability unrestricted
Abstract
Friction Stir Welding (FSW) is a solid-state joining process developed by The Welding Institute (TWI) in 1991. The large axial forces associated with this process are typically cited as one of the major obstacles to its widespread application. The primary objective of this research is to quantify the reduction of axial force through use of diamond coatings of FSW tools. Results of welds for coated and uncoated tools on Al 6061 are compared. The goal is to produce friction stir welds using the diamond-coated tool that are comparable in quality to those performed using conventional tool materials, but with an appreciable reduction in tool wear and/or axial force. A finite element solver is used to model the stresses and deformations for the coated and uncoated tools.

Aluminum Metal Matrix Composites (Al-MMCs) are used in many naval and aerospace structures. An MMC material is comprised of two parts: a continuous metal matrix (in this case Aluminum) and reinforcing particles dispersed throughout the matrix. The secondary objective of this research is to parameterize the friction stir welding of Aluminum 6061 Metal Matrix Composites reinforced with 17.5 percent Silicon Carbide particles, a superabrasive material valued for its high strength to weight ratio. A range of acceptable process parameters for the joining of this material is established. Since tool wear is a limiting factor in the joining of MMCs, tool wear is periodically monitored and quantified using an optical comparator.

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