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

Published online by Cambridge University Press:  13 November 2018

Roman Gröger Open the ORCID record for Roman Gröger [Opens in a new window] ,
Zdeněk Chlup ,
Tereza Kuběnová  and
Ivo Kuběna
Roman Gröger*
Affiliation:
Institute of Physics of Materials & CEITEC IPM, Academy of Sciences of the Czech Republic, Brno 61600, Czech Republic
Zdeněk Chlup
Affiliation:
Institute of Physics of Materials & CEITEC IPM, Academy of Sciences of the Czech Republic, Brno 61600, Czech Republic
Tereza Kuběnová
Affiliation:
Institute of Physics of Materials & CEITEC IPM, Academy of Sciences of the Czech Republic, Brno 61600, Czech Republic
Ivo Kuběna
Affiliation:
Institute of Physics of Materials & CEITEC IPM, Academy of Sciences of the Czech Republic, Brno 61600, Czech Republic
*
a)Address all correspondence to this author. e-mail: [email protected]
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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 $\left( {0\bar{1}1} \right)$ plane. The expected slip on the $\left( {\bar{1}01} \right)$ 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 $\left[ {011} \right] - \left[ {\bar{1}11} \right]$ edge deform predominantly by twinning on {112}〈111〉 systems with some contribution from slip on the $\left( {\bar{1}01} \right)\left[ {\bar{1}\bar{1}\bar{1}} \right]$ system with the highest Schmid factor. A majority of twins exhibit internal contrast due to alternating slip on $\left( {\bar{1}01} \right)$ and $\left( {0\bar{1}1} \right)$ 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.

Keywords

niobiumsliptwinning77 Kplasticity
Type
Invited Paper
Information
Journal of Materials Research , Volume 34 , Issue 2 , 28 January 2019 , pp. 261 - 270
Copyright
Copyright © Materials Research Society 2018 

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