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Fatigue damage of ultrafine-grain copper in very-high cycle fatigue region
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SYSNO ASEP 0361095 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Fatigue damage of ultrafine-grain copper in very-high cycle fatigue region Author(s) Lukáš, Petr (UFM-A)
Kunz, Ludvík (UFM-A) RID, ORCID
Navrátilová, Lucie (UFM-A)
Bokůvka, O. (SK)Source Title Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 528, - (2011), s. 7036-7040Number of pages 5 s. Language eng - English Country CH - Switzerland Keywords ultrafine-grained microstructure ; ultrasonic fatigue ; crack initiation ; copper Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects GAP108/10/2001 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000293363100048 DOI 10.1016/j.msea.2011.06.001 Annotation Ultrafine-grained copper produced by ECAP technique was tested in ultrasonic fatigue in the region of lives from 108 to 2x1010 cycles. The fatigue strength of ultrafine-grained copper is by a factor of 2 higher than that of conventional-grain copper. The occurrence of surface fatigue slip markings is rare. No grain coarsening was observed either in bulk or in areas underneath the surface slip markings. Localized collective grain-boundary slip of near-by oriented grains is considered to be the main damage mechanism leading to fatigue microcrack initiation either directly in the roots of surface intrusions or underneath the surface slip markings. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2012
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