|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||176 High-Temperature Oxidation of Ti-48Al-2Cr-2Nb-(0~1%)W Alloys in Air
||Min Jung Kim, Dong Bok Lee, Sung June Bong
|On-Site Speaker (Planned)
||Min Jung Kim
Three powder metallurgy (PM) TiAl alloys with a fully lamellar structure were oxidized isothermally and cyclically between 800 and 1000 oC in air in order to find the effect of W on the oxidation behavior of Ti-48Al-2Cr-2Nb alloys. The alloys oxidized parabolically during isothermal oxidation. Tungsten improved the isothermal and cyclic oxidation resistance. The oxide scales consisted primarily of an outer TiO2 layer, an intermediate Al2O3-rich layer, and an inner TiO2-rich layer. The alloying elements of Cr, Nb, and W tended to segregate in the lower part of the scale owing to their thermodynamic nobility. In the vicinity of the scale/matrix interface, TiN and Ti2AlN coexisted. Acknowledgement. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Korean Ministry of Education, Science and Technology (Project No. 2010-0023002).