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Oxidation of Powder Metallurgy (PM) Ti-48%Al-2%Cr-2%Nb-(0-1%)W Alloys Between 800 and 1000A degrees C in Air

Author:
Seo, Dong Yi  Nguyen, Thuan Dinh  Lee, Dong Bok  


Journal:
OXIDATION OF METALS


Issue Date:
2010


Abstract(summary):

Three powder metallurgy (PM) TiAl alloys with a fully lamellar structure were oxidized isothermally and cyclically between 800 and 1000A degrees C 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 TiO(2) layer, an intermediate Al(2)O(3)-rich layer, and an inner TiO(2)-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 Ti(2)AlN coexisted.


Page:
145---156


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