D.Y. Seo
Structures and Materials Performance laboratory, Institute for Aerospace Research
National Research Council of Canada , Ottawa , Ontario , K1A OR6

The Materials Component Technologies (MCT) group in the Structures and Materials Performance Laboratory (SMPL), Institute for Aerospace Research (IAR), National Research Council of Canada (NRC), has been involved actively in the development of high temperature alloys and coatings for aerospace applications. In particular, this group specializes in evaluation of high temperature alloys and characterization of high temperature coatings using the IAR burner rig. In this seminar, major evaluation capabilities of high temperature materials and coatings will be introduced briefly. In addition, the results from previous and on-going projects on TiAl intermetallics will be presented and the important finding will be highlighted.

Various TiAl alloys, produced by powder metallurgy (PM) and directional solidification (DS) processes, were successfully HIPed and heat treated to produce fully lamellar (FL) microstructure. A heat treatment with stepped cooling and aging was developed to produce FL microstructures and to stabilize the microstructure. Microstructural features such as grain boundaries, precipitates, and lamellae were examined by electron microscopy. To evaluate the high temperature mechanical properties of these alloys, tension creep tests were carried out in a r at 760ºC at various initial engineering stress levels. The results from this study can be used to identify the processing and heat treatment conditions to optimize the creep resistance as well as to elucidate the creep mechanisms of these materials.

For further information please contact Prof. Tom Bieler, Department of Chemical Engineering and Materials Science at bieler@egr.msu.edu . Persons with disabilities have the right to request and receive reasonable accommodation.

Persons with disabilities have the right to request and receive reasonable accommodation. . Please call the Department of Chemical Engineering and Materials Science at 355-5135 at least one day prior to the seminar; requests received after this date will be met when possible.