Compositions of the γ, γ' and DO22 phases in the nickel-base superalloy RSR 143 (76Ni-13A1-9Mo-2Ta, at. %) have been determined via atom probe field-ion microscopy (APFIM) as 76Ni-6A1-18Mo, 67Ni-25A1-4Mo-4Ta and be 73Ni-4A1-20Mo-3Ta respectively. Using energy dispersive x-ray spectroscopy in the analytical transmission electron microscopy (TEM), the composition of the γ' phase (69Ni-22A1-4Mo-5Ta) was found to be similar to that determined by APFIM. The deviation of the DO22 composition from Ni3Mo is in agreement with the prediction of a recent TEM study (Martin et al, 1980, 1982).
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Melmed et al. (1984) studied this question.
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