Scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD) were employed to study the phase in a directionally solidified experimental nickel base alloy. It was observed that the phase distribute at interdendritic area and precipitate mainly from the 0 phase in this experimental alloy. Orientation relationship between the 0 and the phase was found as ð111Þ 0 k ð0001Þ and h " 1 110i 0 k h11 " 2 20i . Detrimental effect of the phase on oxidation resistance of the alloys was also found.
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