From Northwestern University Center for Atom-Probe Tomography
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3D APT of a multicomponent steel alloy

A 3-D visual reconstruction of two nanoscale precipitates found in an Fe-Cu multicomponent steel alloy specimen analyzed using a Local Electrode Atom Probe (LEAP®) from Imago Scientific Instruments. The specimen was aged for 1024-hours at 500 degrees Celsius after solution treatment for 40 minutes at 900 degrees Celsius. The isoconcentration surfaces are at 12.0 at.% Ni - 9.5 Al - 3.0 Mn. An enhanced view of individual Cu (in the precipitate cut by the surface of the reconstruction volume) and Fe atoms are displayed delineating both the precipitate core and matrix. The remaining solute atoms (Ni, Al, Si, and Mn) atoms are not shown for clarity.