Consolidation of surface coatings by friction stir techniques

Download
Author
Young, Jeremiah J.
Date
2010-09Advisor
McNelley, Terry R.
Second Reader
Menon, Sarath
Metadata
Show full item recordAbstract
Friction Stir Processing (FSP) is an emerging technology that allows for the processing of regions near the surface of a material in order to improve upon the existing mechanical properties. Aluminum alloy samples were plasma sprayed with a Titanium-Nickel-Chrome coating or a Titanium coating. Single and multiple pass experiments were performed with both a pinned and a pinless FSP tool at rotation speeds of 400, 800 and 1500 revolutions per minute; all traverses were done at four inches per minute. Optical and electron microscopy methods were then used to determine the success at consolidating the relatively hard and porous Titanium based coatings onto the Aluminum alloy surface. Results showed that the most successful results were accomplished using a flat, pinless tool, with minimal downward force applied to the sample. The Titanium coatings were visibly less porous at microscopic levels, and there was also considerably less separation at the coating-base interface. Energy dispersive x-ray spectroscopy showed very little mixing of the base material and the plasma sprayed coating.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
Related items
Showing items related by title, author, creator and subject.
-
A study of the breakdown mechanism of AISI 304 stainless steel, type 2024 aluminum and various titanium coatings
Beelby, Michael Howard; Ulrich, Henry George, III (Monterey, California. Naval Postgraduate School, 1981-12);An investigation, experimental and theoretical, into the breakdown mechanisms and associated minimum power levels required for the breakdown and unipolar arcing was conducted for AISI 304 stainless steel and Type 2024 ... -
Impurity control of tokamaks with in situ metal deposition
Taylor, R.J.; Bunshah, R.F.; Schwirzke, F. (North-Holland Publishing Company, 1980);Metal coatings of titanium and chromium of different thickness were deposited in situ in microtor and macrotor tokamaks and tested for impurity control. To improve the microstructure of the metal deposit, Ti and Cr were ... -
Plastic instability of aluminide and platinum modified diffusion coatings during 1100˚C cyclic testing.
Manley, Thomas F. II (1985-12);Platinum modified and unmodified aluminide diffusion coatings, on a nickel base superalloy (IN-738), were prepared to test the pre-aluminizing surface roughness effect on coating oxide scale adherence. A preliminary study ...