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Determining the crystallographic orientation of hexagonal crystal structure materials with surface acoustic wave velocity measurements

Lain'e, Steven J.; Dryburgh, Paul; Smith, Richard J.; Marrow, Paul; Lainé, Steven J.; Sharples, Steve D.; Clark, Matt; Li, Wenqi

Authors

Steven J. Lain'e

Paul Dryburgh

Paul Marrow

Steven J. Lainé

Steve D. Sharples

MATT CLARK matt.clark@nottingham.ac.uk
Professor of Applied Optics

WENQI LI Wenqi.Li@nottingham.ac.uk
Senior Research Fellow



Abstract

© 2020 Throughout our engineered environment, many materials exhibit a crystalline lattice structure. The orientation of such lattices is crucial in determining functional properties of these structures, including elasticity and magnetism. Hence, tools for determining orientation are highly sought after. Surface acoustic wave velocities in multiple directions can not only highlight the microstructure contrast, but also determine the crystallographic orientation by comparison to a pre-calculated velocity model. This approach has been widely used for the recovery of orientation in cubic materials, with accurate results. However, there is a demand to probe the microstructure in anisotropic crystals - such as hexagonal close packed titanium. Uniquely, hexagonal structure materials exhibit transverse isotropic linear elasticity. In this work, both experimental and simulation results are used to study the discrete effects of both experimental parameters and varying lattice anisotropy across the orientation space, on orientation determination accuracy. Results summarise the theoretical and practical limits of hexagonal orientation determination by linear SAW measurements. Experimental results from a polycrystalline titanium specimen, obtained by electron back scatter diffraction and spatially resolved acoustic spectroscopy show good agreement (errors of ϕ1=5.14° and Φ=6.99°). Experimental errors are in accordance with those suggested by simulation, according to the experimental parameters. Further experimental results demonstrate dramatically improved orientation results (Φ error

Citation

Lain'e, S. J., Dryburgh, P., Smith, R. J., Marrow, P., Lainé, S. J., Sharples, S. D., …Li, W. (2020). Determining the crystallographic orientation of hexagonal crystal structure materials with surface acoustic wave velocity measurements. Ultrasonics, 108, https://doi.org/10.1016/j.ultras.2020.106171

Journal Article Type Article
Acceptance Date May 5, 2020
Online Publication Date May 29, 2020
Publication Date Dec 1, 2020
Deposit Date Jun 2, 2020
Publicly Available Date Jun 2, 2020
Journal Ultrasonics
Print ISSN 0041-624X
Electronic ISSN 1874-9968
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 108
Article Number 106171
DOI https://doi.org/10.1016/j.ultras.2020.106171
Keywords Orientation determination; Crystallographic characterisation; Surface acoustic waves; Hexagonal crystal; Grain structure
Public URL https://nottingham-repository.worktribe.com/output/4519123
Publisher URL https://www.sciencedirect.com/science/article/pii/S0041624X20301104
Additional Information This article is maintained by: Elsevier; Article Title: Determining the crystallographic orientation of hexagonal crystal structure materials with surface acoustic wave velocity measurements; Journal Title: Ultrasonics; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.ultras.2020.106171; Content Type: article; Copyright: Crown Copyright © 2020 Published by Elsevier B.V.

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