Cu-rich and NiAl- type precipitates,
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Cu-rich and NiAl- type precipitates, 5 -10 nm in diameter. Fe 3 C-type Cementite. 59 nm. Cu-rich Precipitates. Small (2nm diameter). Al. Mn. C. Cu. Ni. Si. Fe. 45 nm. 44 nm.

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45 nm

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45 nm

Cu-rich and NiAl- type precipitates, 5 -10 nm in diameter

Fe3C-typeCementite

59 nm

Cu-rich Precipitates

Small (2nm diameter)

Al

Mn

C

Cu

Ni

Si

Fe

45 nm

44 nm

Atom-by-Atom Materials Analysis by LEAP TomographyNSF MRI Instrumentation Grant DMR-0420532, David N. Seidman, PI

The high-strength low-carbon steel NUCu-150, developed at Northwestern University, obtains its excellent strength through small nanometer-sized Cu-rich precipitates. The Local-Electrode Atom-Probe (LEAP™), acquired with NSF support, allows for an atom-by-atom analysis of all phases in this steel. A quantitative concentration profile across the cementite precipitate seen at the top left is shown below.

Fe3C-typeCementite


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