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Influence of the Surface Condition of Specimens on the Size of Coherently Diffracting Domains.
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SYSNO ASEP 0483126 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Influence of the Surface Condition of Specimens on the Size of Coherently Diffracting Domains. Author(s) Klečka, Jakub (UFP-V) ORCID
Lukáč, František (UFP-V) ORCID
Dudr, Martin (UFP-V)Source Title Solid State Phenomena, Contribution of Metallography to Production Problem Solutions II, 270. - Zürich : Trans Tech Publications Ltd., 2017 / Kasl J. - ISSN 1662-9779 - ISBN 978-3-0357-1241-4 Pages s. 124-129 Number of pages 6 s. Publication form Print - P Action CCMPPS 2017 International Conference on Contribution of Metallography to Production Problem Solutions Event date 06.06.2017 - 08.06.2017 VEvent location Mariánské Lázně Country CZ - Czech Republic Event type EUR Language eng - English Country CH - Switzerland Keywords Coherently Diffracting Domains ; High Entropy Alloys ; Rietveld Refinement ; X-Ray Diffraction Subject RIV JK - Corrosion ; Surface Treatment of Materials OECD category Coating and films R&D Projects GA17-17016S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 EID SCOPUS 85038207450 DOI 10.4028/www.scientific.net/SSP.270.124 Annotation Metallic sample preparation process from cutting to polishing introduces defects into the subsurface layers by plastic deformation. Methods of bulk sample characterization are usually sensitive to the microstructure and presence of defects e.g. dislocations, grain boundaries, etc. near the surface. The X-ray diffraction technique (XRD) is a unique method used primarily for phase identification and quantification of crystalline materials. The extending of the method by the whole pattern fitting using Rietveld refinement analysis enables also utilisation for other purposes such as determination of the size of coherently diffracting domains (CDD). This property quantifies the degree of disorder in material and is usually correlated with mean crystallite size, i.e. subgrain size. However, since the penetration depth of the laboratory X-ray radiation is limited to the order of tens of micrometers (depending on the material), the observed result is highly affected by the density of defects such as dislocations in the surface area of the specimen and thus by their surface condition. The effect of the different final steps of grinding and polishing on the observed size of CDD was studied and discussed for two materials - aluminum Al7075 alloy and high entropy alloy HfNbTaTiZr. The reasonable finishing for the optimal results was found for both materials. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
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