3D nanostructural characterisation of grain boundaries in atom probe data utilising machine learning methods

Autoři: Ye Wei aff001;  Zirong Peng aff001;  Markus Kühbach aff001;  Andrew Breen aff002;  Marc Legros aff002;  Melvyn Larranaga aff002;  Frederic Mompiou aff002;  Baptiste Gault aff001
Působiště autorů: Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf, Germany aff001;  CEMES-CNRS, 29 Rue Jeanne-Marvig, Toulouse, France aff002;  Department of Materials, Royal School of Mines, Imperial College, London, England, United Kingdom aff003
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0225041


Boosting is a family of supervised learning algorithm that convert a set of weak learners into a single strong one. It is popular in the field of object tracking, where its main purpose is to extract the position, motion, and trajectory from various features of interest within a sequence of video frames. A scientific application explored in this study is to combine the boosting tracker and the Hough transformation, followed by principal component analysis, to extract the location and trace of grain boundaries within atom probe data. Before the implementation of this method, these information could only be extracted manually, which is time-consuming and error-prone. The effectiveness of this method is demonstrated on an experimental dataset obtained from a pure aluminum bi-crystal and validated on simulated data. The information gained from this method can be combined with crystallographic information directly contained within the data, to fully define the grain boundary character to its 5 degrees of freedom at near-atomic resolution in three dimensions. It also enables local atomic compositional and geometric information, i.e. curvature, to be extracted directly at the interface.

Klíčová slova:

Algorithms – Aluminum – Boosting algorithms – Curvature – Evaporation – Machine learning – Machine learning algorithms – principal component analysis


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2019 Číslo 11