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Slip dislocation and twin nucleation mechanisms in hcp metals

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Abstract

A new nucleation mechanism is proposed for \( \{ 10\bar{1}1\} \) deformation twin in hcp materials. The mechanism is based on the results of atomistic computer simulations. It was found that under high shear stress applied on \( \{ 10\bar{1}1\} \) plane (the stress level is about 7 % of shear modulus), the core of a slip dislocation can transform to a twin embryo. The transformation and subsequent twin growth are accompanied by nucleation and migration of interfacial defects including disconnections and stacking faults. The paper provides the analysis of the nature of these defects and describes the reactions between them.

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Acknowledgements

The financial supports from Czech Science Foundation (Project 16-14599S), the Spanish MINECO (FIS2015-69017-P), and Ministry of Education, Youth and Sports of the Czech Republic under Project CEITEC 2020 (LQ1601) are gratefully acknowledged.

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Authors and Affiliations

  1. Central European Institute of Technology-Institute of Physics of Materials (CEITEC IPM), Academy of Sciences of the Czech Republic, Žižkova 22, Brno, 61662, Czech Republic

    Andriy Ostapovets

  2. Department of Civil & Environmental Engineering, Universitat Politecnica de Catalunya, Jordi Girona 1-3, 08034, Barcelona, Spain

    Anna Serra

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  1. Andriy Ostapovets
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  2. Anna Serra
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Correspondence to Andriy Ostapovets.

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Ostapovets, A., Serra, A. Slip dislocation and twin nucleation mechanisms in hcp metals. J Mater Sci 52, 533–540 (2017). https://doi.org/10.1007/s10853-016-0351-4

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