A study was conducted to observe the (~xidation of NiAl+3.5at.%Fe alloy in ~-NiAI phase field at air temperatures of 1000, 1200 and 1400"C, and these results were compared with those of pure NiAI alloys. The primary effects of the Fe-addition in NiAI were round to be: l) decrease in oxidation resistance and adherence of scales during both isothermal and cyclic oxidation tests, 2) enhancement of phase transformation rate from 0-to a-AI20,, 3) more rapid fl)rmation of characteristically ridged a-Al~O~ scales during initial ,:)xidation stages, and 4) partial scaling of voids formed at the scale-substrate interlace and dissolulion of Fe inside the alumina scale by the ~mtward diffusion of Fe from the substrate alh~y.

No abstract