Abstract
The influence of initial microstructure and Mo composition on the high-temperature creep behaviour of two crept model Ni- x at.%Mo-2.0 at.%Ta-13.7 at.%Al( x = 8.7 and 9.2 at.%) superalloys has been investigated by the techniques of transmission electron microscopy (TEM) and atom probe field ion microscopy (APFIM). Acicular δ phase precipitates of approximate stoichiometry NiMo have been observed by TEM and APFIM in both alloys. However, a marked difference in γ′ morphology is observed between the alloys due to different initial microstructures. Small variations in the initial morphologies of the γ′ microstructure rather than Mo composition play a significant role in affecting creep strength in this alloy system.
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