Study of cyclic strain localization and fatigue crack initiation using FIB technique

0353822 - ÚFM 2011 RIV PL eng A - Abstrakt
Man, Jiří - Kuběna, Ivo - Weidner, A. - Vystavěl, T. - Kruml, Tomáš - Polák, Jaroslav
Study of cyclic strain localization and fatigue crack initiation using FIB technique.
XV International Colloquium Mechanical Fatigue of Metals - ABSTRACTS. Opole: Opole University of Technology, 2010 - (Rozumek, D.; Macha, E.). s. 36-36. ISBN 978-83-60691-83-0.
[International Colloquim Mechanical Fatigue of Metals /15./. 13.09.2010-15.09.2010, Opole]
Grant CEP: GA ČR(CZ) GAP108/10/2371
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: focused ion beam (FIB) * persistent slip band * fatigue crack initiation
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

Focused ion beam (FIB) technique together with other advanced microscopic techniques was applied to study the early microstructural changes leading to fatigue crack initiation in cyclically strained polycrystals. Dislocation structures of persistent slip bands (PSBs) and surrounding matrix were investigated in detail using electron channeling contrast imaging (ECCI) technique (simultaneously in the FIB cross-section and on the specimen surface) and transmission electron microscopy (TEM) of thin surface foils prepared by in situ lift-out technique. True shape of extrusions and intrusions and the path of initiated fatigue cracks were assessed in three dimensions by FIB micro-tomography. Advantageous potential and some limitations of FIB technique in fatigue crack initiation studies in polycrystals are highlighted.
Trvalý link: http://hdl.handle.net/11104/0192958