Abstract
A combined atom probe field ion microscopy and analytical electron microscopy characterization has been performed on laboratory aged martensitic and austenitic specimens of FeNi and FeNiP alloys. These techniques revealed that the martensitic 24.1 and 28.6at.%Ni alloys decomposed during aging for 1 year at 300°C to form face centered cubic precipitates of ∼56at.%Ni in a body centered cubic matrix containing ∼20at.%Ni. Some thin platelets were observed in the field ion micrographs of the austenitic Fe-42.9at.%Ni alloy and the Fe-43.2at.%Ni-0.44at.%P alloy after aging at 400 and 350°C. Atom probe analysis revealed phosphorus clustering in the ternary alloy aged at 300°C.
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