EBSD and subtle crystallographic differences— A study of resolving interlayer spacings in Nb-Ni and Nb-Co μ phases
Ultramicroscopy, pp. 114463
Abstract
In ordered intermetallics, slight variations in lattice site occupancy and specific interlayer spacings have been identified as the sources of significant changes in critical resolved shear stress and therefore how a given phase may affect alloy properties. So far, atom positions and lattice site occupancies have traditionally been characterised by high-resolution transmission electron microscopy (HR-TEM) and X-ray diffraction (XRD), which are methods which offer either local detail or high statistical significance but not both. Electron backscatter diffraction (EBSD), by contrast, provides high spatial resolution across large sample areas and therefore, has the potential to enable the local investigation of interlayer spacing and site lattice occupancy with improved statistical reliability. The objectives of the study are to benchmark EBSD’s capability for resolving these subtle features and to correlate them with compositional and mechanical properties. In this case study, we therefore show that EBSD can resolve key crystallographic features of μ -phase intermetallics, specifically interlayer spacings. We combine pattern matching with large-scale dynamical simulations of template libraries guided by XRD based information on lattice parameters. For this, we generate structures that vary in the spacing between triple-layer and Kagome layer and in the site lattice occupancy of the 3a site. This approach successfully predicts the change of interlayer spacing between Kagome and triple layers in Nb–Co and Nb–Ni μ -phases, in good agreement with XRD and HR-TEM.
Authors 12
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Affiliation as printed
Institute for Physical Metallurgy and Materials Physics, RWTH Aachen University, Kopernikusstr. 14, Aachen, 52074, Germany
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Affiliation as printed
Institute for Physical Metallurgy and Materials Physics, RWTH Aachen University, Kopernikusstr. 14, Aachen, 52074, Germany
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Aachen Institute for Advanced Study in Computational Engineering Science · RWTH Aachen University
Affiliation as printed
Aachen Institute for Advanced Study in Computational Engineering - AICES, RWTH Aachen University, Aachen, 52074, Germany
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Affiliation as printed
Central Facility for Electron Microscopy, RWTH Aachen University, Ahornstr. 55, Aachen, 52074, Germany
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Affiliation as printed
Institute for Physical Metallurgy and Materials Physics, RWTH Aachen University, Kopernikusstr. 14, Aachen, 52074, Germany
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Affiliation as printed
Central Facility for Electron Microscopy, RWTH Aachen University, Ahornstr. 55, Aachen, 52074, Germany
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Helmholtz-Zentrum Berlin für Materialien und Energie · Max-Planck-Institut für Nachhaltige Materialien
Affiliation as printed
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, 12489, Germany
Max Planck Institute for Sustainable Materials, Max–Planck-Str. 1, Düsseldorf, 40237, Germany
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Max-Planck-Institut für Nachhaltige Materialien
Affiliation as printed
Max Planck Institute for Sustainable Materials, Max–Planck-Str. 1, Düsseldorf, 40237, Germany
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Affiliation as printed
Central Facility for Electron Microscopy, RWTH Aachen University, Ahornstr. 55, Aachen, 52074, Germany
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Aachen Institute for Advanced Study in Computational Engineering Science · RWTH Aachen University
Affiliation as printed
Aachen Institute for Advanced Study in Computational Engineering - AICES, RWTH Aachen University, Aachen, 52074, Germany
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University of British Columbia
Affiliation as printed
University of British Columbia, Department of Materials Engineering, 309-6350 Stores Road, Vancouver, V6T 1Z4, Canada
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Affiliation as printed
Institute for Physical Metallurgy and Materials Physics, RWTH Aachen University, Kopernikusstr. 14, Aachen, 52074, Germany
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