Grain boundary networks in nanocrystalline alloys from atom probe tomography quantization and autocorrelation mapping

TitleGrain boundary networks in nanocrystalline alloys from atom probe tomography quantization and autocorrelation mapping
Publication TypeJournal Article
Year of Publication2015
AuthorsChen, Y, Schuh, CA
JournalPhysica Status Solidi a-Applications and Materials Science
Volume212
Issue10
Pagination2302 - 2308
Date Published2015/10//
Abstract

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.