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Profiles of persistent slip markings and internal structure of underlying persistent slip bands
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SYSNO ASEP 0480348 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Profiles of persistent slip markings and internal structure of underlying persistent slip bands Author(s) Polák, Jaroslav (UFM-A) RID, ORCID
Mazánová, Veronika (UFM-A)
Heczko, Milan (UFM-A) ORCID
Kuběna, Ivo (UFM-A) RID, ORCID
Man, Jiří (UFM-A) RID, ORCIDNumber of authors 5 Source Title Fatigue and Fracture of Engineering Materials and Structures - ISSN 8756-758X
Roč. 40, č. 7 (2017), s. 1101-1116Number of pages 16 s. Language eng - English Country US - United States Keywords copper ; dislocation structure ; extrusions ; fatigue crack initiation ; intrusions ; stainless steel Subject RIV JL - Materials Fatigue, Friction Mechanics OECD category Audio engineering, reliability analysis R&D Projects ED1.1.00/02.0068 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015069 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA13-23652S GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 UT WOS 000402791200007 EID SCOPUS 85010607480 DOI 10.1111/ffe.12567 Annotation Focused ion beam sections and lamellae for transmission electron microscopy were prepared from fatigued specimens of polycrystalline copper and austenitic Sanicro 25 steel. The profiles of persistent slip markings developed on the surface were observed and documented simultaneously with the underlying dislocation structure. In copper fatigued at room temperature and close to liquid nitrogen temperature, persistent slip markings consisting of pronounced extrusions and parallel intrusions appeared at locations where persistent slip bands having the ladder-like dislocation structure egress on the surface. Stage I cracks initiated from the tip of the intrusions. In Sanicro 25 steel, more planar character of the dislocation structure led to thin extrusions and intrusions and several stage I cracks running parallel to the primary slip plane. Exceptionally, ladder-like structure and generally alternating dislocation-rich and dislocation-poor volumes were observed in the PSBs. Dislocations bands of secondary slip systems in the matrix disappeared on intersections with PSBs. Experimental findings were compared with predictions of recent physically based models of fatigue crack initiation. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2018
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