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Gusenbauer et al 2020, Extracting local nucleation fields in permanent magnets.pdf2,12 MBAdobe PDFView/Open
Title: Extracting local nucleation fields in permanent magnets using machine learning
Authors: Gusenbauer, MarkusOezelt, HaraldFischbacher, JohannKovacs, AlexanderZhao, PanpanWoodcock, Thomas GeorgeSchrefl, Thomas
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Issue Date: 2020
Published in: npj Computational Materials Vol. 6 (2020)
Publisher: Berlin : Springer Nature
Abstract: Microstructural features play an important role in the quality of permanent magnets. The coercivity is greatly influenced by crystallographic defects, like twin boundaries, as is well known for MnAl-C. It would be very useful to be able to predict the macroscopic coercivity from microstructure imaging. Although this is not possible now, in the present work we examine a related question, namely the prediction of simulated nucleation fields of a quasi-three-dimensional (rescaled and extruded) system constructed from a two-dimensional image. We extract features of the image and analyze them via machine learning. A large number of extruded systems are constructed from 10 × 10 pixel sub-images of an Electron Backscatter Diffraction (EBSD) image using an automated meshing procedure. A local nucleation field is calculated by micromagnetic simulation of each quasi-three-dimensional system. Decision trees, trained with the simulation results, can predict nucleation fields of these quasi-three-dimensional systems from new images within seconds. As for now we cannot quantitatively predict the macroscopic coercivity, nevertheless we can identify weak spots in the magnet and see trends in the nucleation field distribution.
Keywords: permanent magnets; microstructure imaging; machine learning
DDC: 620
License: CC BY 4.0 International
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