Corrosion Fatigue Studies on a Bulk Glassy Zr-Based Alloy under Three-Point Bending

dc.bibliographicCitation.firstPage60
dc.bibliographicCitation.journalTitleFrontiers in Materialseng
dc.bibliographicCitation.volume3
dc.contributor.authorGrell, Daniel
dc.contributor.authorWilkin, Yannic
dc.contributor.authorGostin, Petre F.
dc.contributor.authorGebert, Annett
dc.contributor.authorKerscher, Eberhard
dc.date.accessioned2022-12-23T08:00:12Z
dc.date.available2022-12-23T08:00:12Z
dc.date.issued2017-1-9
dc.description.abstractCorrosion fatigue (CF) tests were carried out on bulk glassy Zr52.5Cu17.9Al10Ni14.6Ti5 (Vitreloy 105) samples under load-controlled three-point bending conditions with a load ratio of R = 0.1 in 0.01 M Na2SO4 + 0.01 M NaCl electrolyte. During cyclic testing, the bar-shaped specimens were polarized in situ at constant potentials and the current was monitored. Three different anodic potentials within the interval between the pitting potential EP and the repassivation potential ER and three different load amplitudes were applied. In some cases, in situ microscopic observations revealed the formation of black corrosion products in the vicinity of the crack tip during anodic polarization. Fractographic analysis revealed a clear distinction between two modes of crack growth characterized by smooth dissolution induced regions on the one hand and slim fast fracture areas on the other hand. Both alternating features contributed to a broad-striated CF fracture surface. Moreover, further fatigue tests were carried out under free corrosion conditions yielding additional information on crack initiation and crack propagation period by means of the open circuit potential (OCP) changes. Thereby, a slight increase in OCP was detected after rupture of the passive layer due to bare metal exposed to the electrolyte. The electrochemical response increased continuously according to stable crack propagation until fracture occurred. Finally, the fracture surfaces of the CF samples were investigated by energy dispersive X-ray with the objective of analyzing the elemental distribution after anodic dissolution. Interestingly, anodic polarization at a near repassivation potential of −50 mV vs. saturated calomel electrode (SCE), which commands a constant electric potential of E = 0.241 V vs. standard hydrogen electrode (SHE), led to favorable effects on the fatigue lifetime. In conclusion, all results are conflated to a CF model for bulk glassy Vitreloy 105 under anodic polarization in chloride-containing electrolyte and compared to the previously proposed stress corrosion mechanisms under similar conditions. © 2017 Grell, Wilkin, Gostin, Gebert and Kerscher.eng
dc.description.versionpublishedVersioneng
dc.identifier.urihttps://oa.tib.eu/renate/handle/123456789/10720
dc.identifier.urihttp://dx.doi.org/10.34657/9756
dc.language.isoeng
dc.publisherLausanne : Frontiers Media
dc.relation.doihttps://doi.org/10.3389/fmats.2016.00060
dc.relation.essn2296-8016
dc.rights.licenseCC BY 4.0 Unported
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.ddc620
dc.subject.otherBulk amorphous alloyseng
dc.subject.otherCorrosion fatigueeng
dc.subject.otherFractureeng
dc.subject.otherMechanical characterizationeng
dc.subject.otherShear bandseng
dc.titleCorrosion Fatigue Studies on a Bulk Glassy Zr-Based Alloy under Three-Point Bendingeng
dc.typeArticleeng
dc.typeTexteng
tib.accessRightsopenAccesseng
wgl.contributorIFWD
wgl.subjectIngenieurwissenschaftenger
wgl.typeZeitschriftenartikelger
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