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Interplay of slip and twinning in niobium single crystals compressed at 77 K

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Abstract

High-purity niobium single crystals of five different orientations were compressed at 77 K to 2–4% plastic strain to investigate the mechanisms operative in the initial stage of yielding. The crystals deformed in the direction close to the [001] axis exhibit predominant slip on the high-stressed (101) and a much lower stressed (\(0\overline{1}1]\)) plane. The expected slip on the (\(\overline{1}01]\)) plane is nearly homogeneously distributed with only a few sharp slip traces corresponding to localized slip. The samples compressed along center-triangle orientations and those close to the [011] - [\(\overline{1}11]\)] edge deform predominantly by twinning on {112{<111> systems with some contribution from slip on the (\(\overline{1}01]\)) [\(\overline{1}\overline{1}\overline{1}]\)] system with the highest Schmid factor. A majority of twins exhibit internal contrast due to alternating slip on (\(\overline{1}01\)) and (\(0\overline{1}1\)) planes. No slip traces are observed in the matrix adjacent to the twin, which implies that twin boundaries are impenetrable obstacles for the motion of dislocations.

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ACKNOWLEDGMENTS

The authors acknowledge helpful discussions on the anomalous slip with Vaclav Vitek. This research was made possible due to financial support from the Czech Science Foundation, Grant No. 16-13797S. It has been carried out under the project CEITEC 2020 (LQ1601) with financial support from the Ministry of Education, Youth and Sports of the Czech Republic under the National Sustainability Programme II.

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  1. Institute of Physics of Materials & CEITEC IPM, Academy of Sciences of the Czech Republic, Brno, 61600, Czech Republic

    Roman Gröger, Zdeněk Chlup, Tereza Kuběnová & Ivo Kuběna

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  1. Roman Gröger
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  2. Zdeněk Chlup
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  4. Ivo Kuběna
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Correspondence to Roman Gröger.

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Gröger, R., Chlup, Z., Kuběnová, T. et al. Interplay of slip and twinning in niobium single crystals compressed at 77 K. Journal of Materials Research 34, 261–270 (2019). https://doi.org/10.1557/jmr.2018.398

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  • DOI: https://doi.org/10.1557/jmr.2018.398

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