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doi:10.22028/D291-31821
Titel: | Structural instabilities during cyclic loading of ultrafine-grained copper studied with micro bending experiments |
VerfasserIn: | Kapp, Marlene W. Kremmer, Thomas Motz, Christian Yang, Bo Pippan, Reinhard |
Sprache: | Englisch |
Titel: | Acta Materialia |
Bandnummer: | 125 |
Startseite: | 351 |
Endseite: | 358 |
Verlag/Plattform: | Elsevier |
Erscheinungsjahr: | 2016 |
Freie Schlagwörter: | Severe plastic deformation Low cycle fatigue Cyclic softening Grain growth Grain boundary migration |
DDC-Sachgruppe: | 600 Technik |
Dokumenttyp: | Journalartikel / Zeitschriftenartikel |
Abstract: | The cyclic mechanical properties and microstructural stability of severe plastically deformed copper were investigated by means of micro bending experiments. The ultrafine-grained structure of OFHC copper was synthesized utilizing the high pressure torsion (HPT) technique. Micron sized cantilevers were focused-ion-beam milled and subsequently tested within a scanning electron microscope in the low cycle fatigue regime at strain amplitudes in the range of 1.1 − 3.2 ∗ 10−3. It was found that HPT processed ultra-fine grained copper is prone to cyclic softening, which is a consequence of grain coarsening in the absence of shear banding in the micro samples. Novel insights into the grain coarsening mechanism were revealed by quasi in-situ EBSD scans, showing i) continuous migration of high angle grain boundaries, ii) preferential growth of larger grains at the expense of adjacent smaller ones, iii) a reduction of misorientation gradients within larger grains if the grain structure in the neighborhood is altered and iv) no evidence that a favorable crystallographic orientation drives grain growth during homogeneous coarsening at moderate accumulated strains, tested here. |
DOI der Erstveröffentlichung: | 10.1016/j.actamat.2016.11.040 |
Link zu diesem Datensatz: | urn:nbn:de:bsz:291--ds-318211 hdl:20.500.11880/29469 http://dx.doi.org/10.22028/D291-31821 |
ISSN: | 1359-6454 |
Datum des Eintrags: | 28-Jul-2020 |
Fakultät: | NT - Naturwissenschaftlich- Technische Fakultät |
Fachrichtung: | NT - Materialwissenschaft und Werkstofftechnik |
Professur: | NT - Prof. Dr. Frank Mücklich |
Sammlung: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
Dateien zu diesem Datensatz:
Datei | Beschreibung | Größe | Format | |
---|---|---|---|---|
1-s2.0-S1359645416309077-main.pdf | Structural instabilities | 2,51 MB | Adobe PDF | Öffnen/Anzeigen |
Diese Ressource wurde unter folgender Copyright-Bestimmung veröffentlicht: Lizenz von Creative Commons