{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T15:25:42Z","timestamp":1781277942930,"version":"3.54.1"},"reference-count":39,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2021,10,20]],"date-time":"2021-10-20T00:00:00Z","timestamp":1634688000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002969","name":"Technology Agency of the Czech Republic","doi-asserted-by":"publisher","award":["TN01000071"],"award-info":[{"award-number":["TN01000071"]}],"id":[{"id":"10.13039\/501100002969","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100008530","name":"European Regional Development Fund","doi-asserted-by":"publisher","award":["ITMS2014+ code 313011ASK8"],"award-info":[{"award-number":["ITMS2014+ code 313011ASK8"]}],"id":[{"id":"10.13039\/501100008530","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Science Grant Agency of the Slovak Republic","award":["1\/0153\/21"],"award-info":[{"award-number":["1\/0153\/21"]}]},{"name":"Science Grant Agency of the Slovak Republic","award":["1\/0117\/21"],"award-info":[{"award-number":["1\/0117\/21"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>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 \u00d7 109 cycles compared to the 80 MPa determined at 60 Hz for 1 \u00d7 107 cycles.<\/jats:p>","DOI":"10.3390\/ma14216245","type":"journal-article","created":{"date-parts":[[2021,10,20]],"date-time":"2021-10-20T21:29:46Z","timestamp":1634765386000},"page":"6245","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Fatigue Crack Initiation Change of Cast AZ91 Magnesium Alloy from Low to Very High Cycle Fatigue Region"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2460-2933","authenticated-orcid":false,"given":"Stanislava","family":"Fintov\u00e1","sequence":"first","affiliation":[{"name":"Institute of Physics of Materials, Czech Academy of Sciences, \u017di\u017ekova 22, 616 00 Brno, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9696-6939","authenticated-orcid":false,"given":"Libor","family":"Tr\u0161ko","sequence":"additional","affiliation":[{"name":"Research Centre, University of \u017dilina, Univerzitn\u00e1 8215\/1, 010 26 \u017dilina, Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6117-240X","authenticated-orcid":false,"given":"Zden\u011bk","family":"Chlup","sequence":"additional","affiliation":[{"name":"Institute of Physics of Materials, Czech Academy of Sciences, \u017di\u017ekova 22, 616 00 Brno, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Filip","family":"Pastorek","sequence":"additional","affiliation":[{"name":"Research Centre, University of \u017dilina, Univerzitn\u00e1 8215\/1, 010 26 \u017dilina, Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Kaj\u00e1nek","sequence":"additional","affiliation":[{"name":"Research Centre, University of \u017dilina, Univerzitn\u00e1 8215\/1, 010 26 \u017dilina, Slovakia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ludv\u00edk","family":"Kunz","sequence":"additional","affiliation":[{"name":"Institute of Physics of Materials, Czech Academy of Sciences, \u017di\u017ekova 22, 616 00 Brno, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,10,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Gupta, M., and Sharon, N.M.L. 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