Research

Processing and properties of gas turbine materials (powder metallurgy, casting – directional solidification and single crystal, heat treatment, titanium aluminides, superalloys); solidifi cation process modelling; corrosion of materials in supercritical carbon dioxide; thermal analysis (DTA, DSC, phase transformations, thermophysical properties).

Application

Development of lightweight materials for aircraft gas turbine blade applications, leading to improved effi ciency and power output. Material compatibility for supercritical carbon dioxide gas turbines used for high effi ciency power generation.

Activities

• Executive Member of ASM International – Ottawa Valley Chapter

Journal Articles

D.Y. Seo, H. Saari, P. Au, and J. Beddoes (2007), “Microstructure and creep of gamma-TiAl containing beta stabilizer,” Materials Science Forum 539-543: 1543-1548.

D.Y. Seo, S. Bulmer, H. Saari, and P. Au (2007), “Microstructures and Mechanical Properties of Ti-48Al-2Cr-2Nb-xW,” Materials Science Forum 561-565: 481-486.

Conference Publications

D. Laurin, D.Y. Seo, H. Saari, Y-W. Kim, “The effects of hot isostatic pressing conditions on the microstructure of beta-gamma titanium aluminide powder alloys,” THERMEC 2009, August 2009.

D.Y. Seo, S. Bulmer, H. Saari, P. Au, “The effects of heat treatments and tungsten additions on microstructures and tensile properties of powder metallurgy Ti-48Al-2Nb-2Cr,” THERMEC 2009, August 2009.

S.R. Hegde, R.M. Kearsey, H. Saari, J. Beddoes, “Microstructure refinement of as-cast single crystal superalloys by re-solidification,” THERMEC 2009, August 2009.

H. Saari, S. Bulmer, D.Y. Seo, and P. Au, “Microstructures and creep properties of powder metallurgy Ti-48Al-2Cr-2Nb+W,” ASME Turbo Expo 2007: Power for Land, Sea, and Air, May 2007.