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Grain boundary networks in nanocrystalline alloys from atom probe tomography quantization and autocorrelation mapping
Author(s) -
Chen Ying,
Schuh Christopher A.
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532236
Subject(s) - nanocrystalline material , atom probe , grain boundary , materials science , autocorrelation , grain size , nanoscopic scale , quantization (signal processing) , anisotropy , spatial analysis , nanotechnology , physics , optics , algorithm , alloy , metallurgy , computer science , mathematics , microstructure , statistics
A local spatial autocorrelation‐based modeling method is developed to reconstruct nanoscale grain structures in nanocrystalline materials from atom probe tomography (APT) data, which provide atomic positions and species, with minimal noise. Using a nanocrystalline alloy with an average grain size of 16 nm as a model material, we reconstruct the three‐dimensional grain boundary network by carrying out two series of APT data quantization using ellipsoidal binning, the first probing the anisotropy in the apparent local atomic density and the second quantifying the local spatial autocorrelation. This approach enables automatic and efficient quantification and visualization of grain structure in a large volume and at the finest nanoscale grain sizes, and provides a means for correlating local chemistry with grain boundaries or triple junctions in nanocrystalline materials. Nanoscale grain boundary networks are reconstructed from atom probe tomography data, which provide atomic positions and species for a fraction of atoms within a nanocrystalline material with an average grain size of 16 nm, using a quantization and local spatial autocorrelation‐based approach.