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.