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From Northwestern University Center for Atom-Probe Tomography
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Interprecipitate Distance Distribution algorithm.

A proxigram obtained from a LEAP tomographic dataset of a dilute Al-Sc-Lu alloy which has been aged at 300 deg C. Nanometer-sized Al3(Sc1-xLux) precipitates are exploited as a strengthening phase. This proxigram quantifies the core/shell structure which develops in the precipitates, with Lu segregating to the center of the precipitates and Sc forming a shell around the core.

(Courtesy: Matt Krug)