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Deformation twinning in vanadium single crystals tested in compression at 77 K
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SYSNO ASEP 0495454 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Deformation twinning in vanadium single crystals tested in compression at 77 K Author(s) Gröger, Roman (UFM-A) RID, ORCID
Chlup, Zdeněk (UFM-A) RID, ORCID
Kuběnová, Tereza (UFM-A)Number of authors 3 Source Title Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 737, NOV (2018), s. 413-421Number of pages 9 s. Language eng - English Country CH - Switzerland Keywords 77 K ; Compression ; Twinning ; Vanadium Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects GA16-13797S GA ČR - Czech Science Foundation (CSF) LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFM-A - RVO:68081723 UT WOS 000448493600046 EID SCOPUS 85054305798 DOI 10.1016/j.msea.2018.09.030 Annotation Vanadium is the least studied non-magnetic body centered cubic metal whose mechanism of plastic deformation is still a subject of controversy. Depending on the level of purity and spatial distribution of interstitial impurities, it has been shown to deform by anomalous slip on the low-stressed (01̅1) plane or by twinning along {112} planes in the 〈111〉 direction. In order to resolve this controversy, we test high-purity vanadium single crystals of four orientations at 77 K under a low strain rate to 1–2% of the plastic strain. All our samples contain spatially homogeneous distribution of impurities and deform predominantly by twinning on two {112}⟨111⟩ systems in which the {112} planes are sheared in the twinning sense. The secondary surface markings correspond to slip on {110}⟨111⟩ systems with the highest Schmid factors, whereas weak (01̅1) slip is found mostly in the vicinity of twins. These results support the argument made previously by Thompson and Carlson (1965) that a spatially homogenenous distribution of interstitial impurities in high purity vanadium single crystals leads to predominant twinning. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019 Electronic address https://www.sciencedirect.com/science/article/pii/S0921509318312279?via%3Dihub
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