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      A quantitative study of stress fields ahead of a slip band blocked by a grain boundary in unalloyed magnesium

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          Abstract

          Stress localization ahead of a slip band blocked by a grain boundary is measured for three different grain boundaries in unalloyed Mg using high-resolution electron backscatter diffraction (HR-EBSD). The results are compared with a theoretical dislocation pile-up model, from which slip system resistance and micro-Hall–Petch coefficients for different grain boundary types are deduced. The results indicate that grain boundary character plays a crucial role in determining micro-Hall–Petch coefficients, which can be used to strengthen classical crystal plasticity constitutive models to make predictions linked to the effect of grain boundary strengthening.

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          High-resolution elastic strain measurement from electron backscatter diffraction patterns: new levels of sensitivity.

          Angus J Wilkinson, Graham Meaden, David J Dingley (2006)
          In this paper, we demonstrate that the shift between similar features in two electron backscatter diffraction (EBSD) patterns can be measured using cross-correlation based methods to +/- 0.05 pixels. For a scintillator screen positioned to capture the usual large solid angle employed in EBSD orientation mapping this shift corresponds to only approximately 8.5 x 10(-5)rad at the pattern centre. For wide-angled EBSD patterns, the variation in the entire strain and rotation tensor can be determined from single patterns. Repeated measurements of small rotations applied to a single-crystal sample, determined using the shifts at four widely separated parts of the EBSD patterns, showed a standard deviation of 1.3 x 10(-4) averaged over components of the displacement gradient tensor. Variations in strains and rotations were measured across the interface in a cross-sectioned Si1-x Gex epilayer on a Si substrate. Expansion of the epilayer close to the section surface is accommodated by tensile strains and lattice curvature that extend a considerable distance into the substrate. Smaller and more localised shear strains are observed close to the substrate-layer interface. EBSD provides an impressive and unique combination of high strain sensitivity, high spatial resolution and ease of use.
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            The plastic deformation of polycrystalline aggregates

            R. Douthwaite, R. Armstrong, N. J. Petch … (1962)
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              The influence of grain boundaries on mechanical properties

              J P Hirth (1972)
              Article 0 comments Cited 71 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Mohsen Taheri Andani: mtaheri@umich.edu
                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group UK (London )
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 20 February 2020
                Publication date PMC-release: 20 February 2020
                Publication date Collection: 2020
                Volume: 10
                Electronic Location Identifier: 3084
                Affiliations
                [1 ]ISNI 0000000086837370, GRID grid.214458.e, Department of Mechanical Engineering, University of Michigan, ; Ann Arbor, MI 48105 USA
                [2 ]ISNI 0000000086837370, GRID grid.214458.e, Department of Materials Science and Engineering, University of Michigan, ; Ann Arbor, MI 48105 USA
                [3 ]ISNI 0000000086837370, GRID grid.214458.e, Department of Aerospace Engineering, University of Michigan, ; Ann Arbor, MI 48105 USA
                Article
                Publisher ID: 59684
                DOI: 10.1038/s41598-020-59684-y
                PMC ID: 7033223
                PubMed ID: 32080234
                SO-VID: 977549dc-5c05-4ae9-9807-30ccc8e2cead
                Copyright © © The Author(s) 2020
                License:

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                Date received : 16 October 2019
                Date accepted : 29 January 2020
                Categories
                Subject: Article
                Custom metadata
                issue-copyright-statement © The Author(s) 2020

                ScienceOpen disciplines: Uncategorized
                Keywords: mechanical properties,metals and alloys
                Data availability:
                ScienceOpen disciplines: Uncategorized
                Keywords: mechanical properties, metals and alloys

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