Ahmels, Laura ; Bruns, Sebastian ; Durst, Karsten ; Bruder, Enrico (2024)
Observation of Grain Boundary Sliding in a Lamellar Ultrafine‐Grained Steel.
In: Advanced Engineering Materials, 2024, 26 (19)
doi: 10.26083/tuprints-00028271
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
The deformation behavior of a ferrite steel with ultrafine‐grained (UFG) lamellar microstructure generated by linear flow splitting is investigated and compared to a coarser cold‐worked reference state, using a set of complementary local deformation and microstructural characterizations methods. The pile‐up around indentations shows a pronounced anisotropy for the UFG lamellar microstructure indicating the relative motion of grains along their elongated boundaries. This observation is confirmed by stepwise compression testing of micropillars along the normal direction of lamellar‐shaped grains using a new faceted pillar geometry to image the initial microstructure and its evolution throughout the test. The surface roughening in pillar compression testing can be categorized into the formation of discrete steps at the surface along particular grain boundaries and a more gradual roughening that is attributed to intragranular dislocation slip. Potential mechanisms for the observed grain boundary sliding are discussed taking several factors such as the strain rate sensitivity and potential Coble creep rates into account. In conclusion, a grain boundary sliding process carried by grain boundary dislocations appears to be the most likely explanation for the observed behavior.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Ahmels, Laura ; Bruns, Sebastian ; Durst, Karsten ; Bruder, Enrico |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Observation of Grain Boundary Sliding in a Lamellar Ultrafine‐Grained Steel |
| Sprache: | Englisch |
| Publikationsjahr: | 27 November 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | Oktober 2024 |
| Ort der Erstveröffentlichung: | Weinheim |
| Verlag: | Wiley-VCH |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Advanced Engineering Materials |
| Jahrgang/Volume einer Zeitschrift: | 26 |
| (Heft-)Nummer: | 19 |
| Kollation: | 11 Seiten |
| DOI: | 10.26083/tuprints-00028271 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/28271 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | The deformation behavior of a ferrite steel with ultrafine‐grained (UFG) lamellar microstructure generated by linear flow splitting is investigated and compared to a coarser cold‐worked reference state, using a set of complementary local deformation and microstructural characterizations methods. The pile‐up around indentations shows a pronounced anisotropy for the UFG lamellar microstructure indicating the relative motion of grains along their elongated boundaries. This observation is confirmed by stepwise compression testing of micropillars along the normal direction of lamellar‐shaped grains using a new faceted pillar geometry to image the initial microstructure and its evolution throughout the test. The surface roughening in pillar compression testing can be categorized into the formation of discrete steps at the surface along particular grain boundaries and a more gradual roughening that is attributed to intragranular dislocation slip. Potential mechanisms for the observed grain boundary sliding are discussed taking several factors such as the strain rate sensitivity and potential Coble creep rates into account. In conclusion, a grain boundary sliding process carried by grain boundary dislocations appears to be the most likely explanation for the observed behavior. |
| Freie Schlagworte: | grain boundary sliding, nanoindentations, pillar compressions, ultrafine‐grained microstructures |
| ID-Nummer: | Artikel-ID: 2400267 |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-282715 |
| Zusätzliche Informationen: | Special Issue: Dedicated to Reinhard Pippan on the Occasion of his 70th Birthday |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physikalische Metallkunde |
| Hinterlegungsdatum: | 27 Nov 2024 12:39 |
| Letzte Änderung: | 28 Nov 2024 06:55 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Observation of Grain Boundary Sliding in a Lamellar Ultrafine‐Grained Steel. (deposited 27 Nov 2024 12:39) [Gegenwärtig angezeigt]
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