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Fatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region
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SYSNO ASEP 0547378 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Fatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region Author(s) Fintová, Stanislava (UFM-A) ORCID
Trško, L. (SK)
Chlup, Zdeněk (UFM-A) RID, ORCID
Pastorek, F. (SK)
Kajánek, D. (SK)
Kunz, Ludvík (UFM-A) RID, ORCIDNumber of authors 6 Article number 6245 Source Title Materials. - : MDPI
Roč. 14, č. 21 (2021)Number of pages 11 s. Language eng - English Country CH - Switzerland Keywords Mg ; fatigue mechanism ; microstructure ; focused ion beam (FIB) ; scanning electron microscopy (SEM) Subject RIV JG - Metallurgy OECD category Materials engineering Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000718657500001 EID SCOPUS 85117769933 DOI 10.3390/ma14216245 Annotation Fatigue tests were performed on the AZ91 cast alloy to identify the mechanisms of the fatigue crack initiation. In different fatigue regions, different mechanisms were observed. In the low and high cycle fatigue regions, slip markings formation accompanied with Mg17Al12 particles cracking were observed. Slip markings act as the fatigue crack initiation sites. The size and number of slip markings decreased with decreased stress amplitude applied. When slip markings formation was suppressed due to low stress amplitude, particle cracking became more important and the cracks continued to grow through the particle/solid solution interface. The change of the fatigue crack initiation mechanisms led the S-N curve to shift to the higher number of cycles to the fracture, demonstrated by its stepwise character. A lower fatigue limit of 60 MPa was determined at 20 kHz for 2 × 10^9 cycles compared to the 80 MPa determined at 60 Hz for 1 × 10^7 cycles. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2022 Electronic address https://www.mdpi.com/1996-1944/14/21/6245
Number of the records: 1