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Alpha Shape Analysis (ASA) Framework for Post- Clustering Property Determination in Atom Probe Tomographic Data

Published online by Cambridge University Press:  07 January 2021

Evan K. Still Open the ORCID record for Evan K. Still [Opens in a new window] ,
Daniel K. Schreiber ,
Jing Wang  and
Peter Hosemann
Evan K. Still
Affiliation:
Department of Nuclear Engineering, University of California, Berkeley, CA94720, USA
Daniel K. Schreiber
Affiliation:
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA99354, USA
Jing Wang
Affiliation:
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA99354, USA
Peter Hosemann*
Affiliation:
Department of Nuclear Engineering, University of California, Berkeley, CA94720, USA
*
*Author for correspondence: Peter Hosemann, E-mail: [email protected]
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Abstract

While application of clustering algorithms to atom probe tomography data have enabled quantification of solute clusters in terms of number density, size, and subcomposition there exist other properties (e.g., volume, surface area, and composition) that are better determined by defining an interface between the cluster and the surrounding matrix. The limitation in composition results from an ion selection step where the expected matrix ion types are omitted from the cluster search algorithm to enhance the contrast between the matrix and cluster and to reduce the complexity of the search. Previously, composition determination within solute clusters has utilized a secondary envelopment and erosion step on top of conventional methods such as maximum separation. In this work, we present a novel stochastic method that combines the particle identification fidelity of a conventional clustering algorithm with the analytical flexibility of mesh-based approaches through the generation of alpha shapes for each identified cluster. The corresponding mesh accounts for concave components of the clusters and determines the volume and surface area of the clusters; additionally, the mesh boundary is utilized to update the total composition according to the internal ions.

Keywords

alpha shapesatom probe tomographycluster-analysissurface reconstruction
Type
Software and Instrumentation
Information
Microscopy and Microanalysis , Volume 27 , Issue 2 , April 2021 , pp. 297 - 317
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of the Microscopy Society of America

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