Fatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region

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 Mg<sub>17</sub>Al<sub&g...

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Autores principales:	Stanislava Fintová, Libor Trško, Zdeněk Chlup, Filip Pastorek, Daniel Kajánek, Ludvík Kunz
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Mg fatigue mechanism microstructure focused ion beam (FIB) scanning electron microscopy (SEM) Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/4d2eae08f3b9426ca71050f6c1d501a9
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spelling	oai:doaj.org-article:4d2eae08f3b9426ca71050f6c1d501a92021-11-11T17:50:00ZFatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region10.3390/ma142162451996-1944https://doaj.org/article/4d2eae08f3b9426ca71050f6c1d501a92021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6245https://doaj.org/toc/1996-1944Fatigue 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 Mg<sub>17</sub>Al<sub>12</sub> 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<sup>9</sup> cycles compared to the 80 MPa determined at 60 Hz for 1 × 10<sup>7</sup> cycles.Stanislava FintováLibor TrškoZdeněk ChlupFilip PastorekDaniel KajánekLudvík KunzMDPI AGarticleMgfatigue mechanismmicrostructurefocused ion beam (FIB)scanning electron microscopy (SEM)TechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6245, p 6245 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mg fatigue mechanism microstructure focused ion beam (FIB) scanning electron microscopy (SEM) Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	Mg fatigue mechanism microstructure focused ion beam (FIB) scanning electron microscopy (SEM) Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Stanislava Fintová Libor Trško Zdeněk Chlup Filip Pastorek Daniel Kajánek Ludvík Kunz Fatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region
description	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 Mg<sub>17</sub>Al<sub>12</sub> 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<sup>9</sup> cycles compared to the 80 MPa determined at 60 Hz for 1 × 10<sup>7</sup> cycles.
format	article
author	Stanislava Fintová Libor Trško Zdeněk Chlup Filip Pastorek Daniel Kajánek Ludvík Kunz
author_facet	Stanislava Fintová Libor Trško Zdeněk Chlup Filip Pastorek Daniel Kajánek Ludvík Kunz
author_sort	Stanislava Fintová
title	Fatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region
title_short	Fatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region
title_full	Fatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region
title_fullStr	Fatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region
title_full_unstemmed	Fatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region
title_sort	fatigue crack initiation change of cast az91 magnesium alloy from low to very high cycle fatigue region
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/4d2eae08f3b9426ca71050f6c1d501a9
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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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