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Interplay of slip and twinning in niobium single crystals compressed\nat 77 K
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SYSNO ASEP 0496930 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Interplay of slip and twinning in niobium single crystals compressed
at 77 KAuthor(s) Gröger, Roman (UFM-A) RID, ORCID
Chlup, Zdeněk (UFM-A) RID, ORCID
Kuběnová, Tereza (UFM-A)
Kuběna, Ivo (UFM-A) RID, ORCIDNumber of authors 4 Source Title Journal of Materials Research. - : Springer - ISSN 0884-2914
Roč. 34, č. 2 (2019), s. 261-270Number of pages 10 s. Language eng - English Country US - United States Keywords niobium ; slip ; twinning ; 77 K ; plasticity 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) Institutional support UFM-A - RVO:68081723 UT WOS 000458506600004 EID SCOPUS 85056606228 DOI 10.1557/jmr.2018.398 Annotation 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 highstressed
(101) and a much lower stressed ð0 11Þ plane. The expected slip on the ð 101Þ 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
½011 ½ 111 edge deform predominantly by twinning on {112}h111i systems with some
contribution from slip on the ð 101Þ½ 1 1 1 system with the highest Schmid factor. A majority of
twins exhibit internal contrast due to alternating slip on ð 101Þ and ð0 11Þ 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.Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
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