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Reversible dislocation motion and microcracking in plastically anisotropic solids under cyclic spherical nanoindentation

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Abstract

Recently, fully reversible dislocation motion was postulated to result in hysteretic nanoindentation load–displacement loops in plastically anisotropic solids. Since microcracking can also result in hysteretic loops, here we define a new parameter, reversible displacement (RD) that can differentiate between the two. For C-plane LiTaO3 surfaces and five other plastically anisotropic solids, the RD values either increase initially or remain constant with cycling. In contradistinction, for glass and A-plane ZnO surfaces, where energy dissipation is presumably due to microcracking or irreversible dislocation pileups, respectively, the RD values decreased continually with cycling.

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ACKNOWLEDGMENTS

This work was supported by the Army Research Office (grant no. W911NF-11-01-0525).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania, 19104, USA

    B. Anasori & M. W. Barsoum

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  1. B. Anasori
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  2. M. W. Barsoum
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Correspondence to B. Anasori.

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For supplementary material for this article, please visit http:// dx.doi.org/10.1557/mrc.2013.39

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Anasori, B., Barsoum, M.W. Reversible dislocation motion and microcracking in plastically anisotropic solids under cyclic spherical nanoindentation. MRS Communications 3, 245–248 (2013). https://doi.org/10.1557/mrc.2013.39

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  • DOI: https://doi.org/10.1557/mrc.2013.39

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