Fig. 1: APT data of Fe-18Al alloy annealing at 523 K for 14 days. | Nature Communications

Fig. 1: APT data of Fe-18Al alloy annealing at 523 K for 14 days.

From: Quantitative three-dimensional imaging of chemical short-range order via machine learning enhanced atom probe tomography

Fig. 1

a APT reconstruction along the [002] zone axis. b two-dimensional detector hit map. Four crystallographic poles were indexed, corresponding to (002), \((\bar{1}02)\), \((\bar{1}\bar{1}2)\), (\(1\bar{1}4\)), respectively. c A close-up of a thin slice in a along [002]. d The z-SDMs of Fe-Fe, Fe-Al, Al-Al pairs in a 2 × 2 × 2 nm3 voxel in a. This signature corresponds to the BCC structure. Typical APT analysis methods: e, f K-nearest neighbour (KNN) distance analysis (k = 1, 2, and 3) of Fe-Fe and Al-Al atoms, respectively, and Exp and Ran refer to the results obtained from experimental and random-labelled datasets, respectively; g Frequency distribution analysis of Fe and Al atoms in comparison to the theoretical binomial random distribution.

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