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Twinning and antitwinning in body-centered cubic metals
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SYSNO ASEP 0563134 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Twinning and antitwinning in body-centered cubic metals Author(s) Gröger, Roman (UFM-A) RID, ORCID
Holzer, Jakub (UFM-A) ORCID
Kruml, Tomáš (UFM-A) RID, ORCIDNumber of authors 3 Article number 111874 Source Title Computational Materials Science. - : Elsevier - ISSN 0927-0256
Roč. 216, JAN (2023)Number of pages 11 s. Language eng - English Country NL - Netherlands Keywords TwinningAntitwinningBCC metalsComputer simulationDiffraction ; Antitwinning ; BCC metals ; Computer simulation ; Diffraction Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects GA19-23411S GA ČR - Czech Science Foundation (CSF) Research Infrastructure CzechNanoLab - 90110 - Vysoké učení technické v Brně Method of publishing Limited access Institutional support UFM-A - RVO:68081723 UT WOS 000882200400009 EID SCOPUS 85140909328 DOI 10.1016/j.commatsci.2022.111874 Annotation Deformation twinning in body-centered cubic (BCC) metals occurs by shearing the crystal along planes parallel to directions. One of these directions (twinning shear) produces a twin, but it is often argued that the opposite sense of shearing (antitwinning shear) does not lead to twin formation. However, recent slip trace and orientational mapping analyses made on many BCC metals after low-temperature plastic deformation show clear evidence of fine misoriented lamellae along the traces of {112} planes sheared in the antitwinning sense. To resolve this controversy, we have utilized molecular statics simulations to determine the energy barriers for uniformly shearing all transition and alkali BCC metals in the twinning and antitwinning sense. The results of these simulations show that twins in transition BCC metals of the 5th and 6th groups can be produced on both types of {112} planes, irrespective of whether the shear is applied in the twinning or the antitwinning sense. However, this is not the case for -Fe and the BCC structures of the alkali metals Li, Na, and K, where twins are likely to occur only on {112} planes sheared in the twinning sense. Furthermore, we have used TEM diffraction pattern analyses to investigate the characters of misoriented deformation lamellae in Nb and Cr compressed at 77 K, which were found along {112} planes sheared in the antitwinning sense. We demonstrate that these regions constitute regular twins. Similar studies on -Fe compressed at 77 K prove that twinning in this material takes place exclusively on {112} planes sheared in the twinning sense. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2024 Electronic address https://www.sciencedirect.com/science/article/pii/S0927025622005857?via%3Dihub
Number of the records: 1