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On the dynamics of twinning in magnesium micropillars
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SYSNO ASEP 0542590 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title On the dynamics of twinning in magnesium micropillars Author(s) Máthis, K. (CZ)
Knapek, Michal (UJF-V) ORCID
Šiška, Filip (UFM-A) RID, ORCID
Harcuba, P. (CZ)
Ugi, D. (HU)
Ispanovity, P. D. (HU)
Groma, I. (HU)
Shin, K. S. (KR)Number of authors 8 Article number 109563 Source Title Materials and Design. - : Elsevier - ISSN 0264-1275
Roč. 203, MAY (2021)Number of pages 10 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords magnesium ; compression ; twinning ; finite element modeling ; scanning electron microscopy Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Materials engineering Subject RIV - cooperation Institute of Physics of Materials - Metallurgy R&D Projects GA18-07140S GA ČR - Czech Science Foundation (CSF) EF16_013/0001794 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UFM-A - RVO:68081723 ; UJF-V - RVO:61389005 UT WOS 000640368300007 EID SCOPUS 85101168309 DOI 10.1016/j.matdes.2021.109563 Annotation Micro-deformation testing has recently gained far-reaching scientific importance as it provides intrinsic information on the dynamics of plastic deformation which is concealed when bulk materials are tested. In this work, single-crystal Mg micropillars favorably oriented for mechanical twinning were tested in compression with con-current scanning electron microscopy imaging. The experimental data were complemented by the finite element modeling in order to reveal the underlying physical background of the observed twinning dynamics. It was shown that the thickness of a twin should reach a critical value before triggering the nucleation of another twin to accommodate further strain. Nucleation and growth are repeated until the twins form throughout the whole micropillar, from top to bottom. Afterwards, the thickening and coalescence of all these twins take place until the entire micropillar volume is twinned. In addition, a line-by-line analysis of the scanning electron microscopy images was employed to reveal the twin lateral growth rates, which were shown to be on the order of 10(-5)-10(-4) m/s. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2022 Electronic address https://doi.org/10.1016/j.matdes.2021.109563
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