Download mse seminar - MSE @ VT

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.