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Abstract The isothermal oxidation behaviour of Ni_3Al-0.lB alloy containing Zr or Cr additions has been studied over a temperature range of 850-1150℃ and for periods up to 100 h. The structure of scale and phase transformation of the surface zone beneath the scale have been investigated by X-ray diffraction, scanning electron microscopy and electron microprobe analyzer ete. The results show that isothermal oxidation kinetics of the alloys at variour temperatures all obey the parabolic law. The additions of Zr, Cr or Cr + Zr obviously improye oxidation resistance at 850 to 950℃ and worsen it at 1050 to 1150℃. The addition of Zr leads to the formation of adherent scale at all temperatures, since the internal oxides are developed like "tree roots'' between the oxide scale and the substrate. But, Zr clearly increases the diffusion of oxygen along A1_2O_3 grain boundaries at elevated temperature. The oxidation scale is generally made of NiO, NiAl_2O_4 and A1_2O_2, There is a little Cr_2O_3 in Cr containing alloy.
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Received: 25 April 1990
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