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MSE SEMINAR December 5, 2008 113 McBryde Hall 3:30 – 4:30 Refreshments at 3:00 Mr. David Gray Graduate Student Materials Science and Engineering Department Virginia Tech “Thermal Modeling of Friction Stir Fabrication” ABSTRACT Current thermal spray technologies are not well suited for the deposition of thick layers of advanced Al-based MMCs on aluminum substrates. The exceedingly high temperatures required to achieve a thick coating using current techniques will significantly change the microstructure of the substrate. Furthermore, current spray-coat techniques result in films with high porosity, high oxide content, and distinct interfaces between coatings and substrates. Friction Stir Fabrication is a low temperature coating process under development with Schultz-Creehan that can theoretically overcome many of the shortfallings of current techniques. However, in order to attain the desired final properties in the substrate, the coating and the interface of the two, a detailed processstructure-properties map must be generated. The first step in the creation of this map is understanding the evolution of the temperature of the workpiece with time. BIOSKETCH Mr. David Gray graduated with a B.S. in Electrical Engineering from Virginia Tech in 2000. He earned his M.S. degree from the MSE Department at Virginia Tech in 2002 under the guidance of Dr. Robert Hendricks in the field of silicon based semiconductors. During the period of 2002-2006, David continued his studies in the field of compound semiconductor material growth under Dr. Guido. He is currently pursuing his Ph.D. degree under the guidance of Dr. Kampe in the area of Friction Stir Fabrication.