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Stress-driven grain boundary movement during nanoindentation in tungsten at room temperature

Javaid, Farhan ; Durst, Karsten (2018)
Stress-driven grain boundary movement during nanoindentation in tungsten at room temperature.
In: Materialia, (1)
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Nanoindentations were performed in the vicinity of grain boundaries (GBs) in polycrystalline tungsten at room temperature, observing in some cases a secondary pop-in (known as GB pop-in) in the load–displacement curve. The dislocation microstructure in the plastic zone of the residual impression was analysed using sequential polishing, electron channelling contrast imaging (ECCI) and electron backscatter diffraction (EBSD) analysis on and below the surface. For some indentations, the interaction of the dislocations within the plastic zone and the GB leads to a localized GB movement on or below the surface. The occurrence and magnitude of GB movement are found to be strongly influenced by misorientation between the adjacent grains, the orientation of the indenter, as well as the applied load and the distance to the GB. The results show that the localized GB movement under an inhomogeneous stress field at room temperature is a possible deformation mechanism for tungsten.

Typ des Eintrags: Artikel
Erschienen: 2018
Autor(en): Javaid, Farhan ; Durst, Karsten
Art des Eintrags: Bibliographie
Titel: Stress-driven grain boundary movement during nanoindentation in tungsten at room temperature
Sprache: Englisch
Publikationsjahr: September 2018
Verlag: Elsevier Science Publishing
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Materialia
(Heft-)Nummer: 1
URL / URN: https://doi.org/10.1016/j.mtla.2018.04.002
Kurzbeschreibung (Abstract):

Nanoindentations were performed in the vicinity of grain boundaries (GBs) in polycrystalline tungsten at room temperature, observing in some cases a secondary pop-in (known as GB pop-in) in the load–displacement curve. The dislocation microstructure in the plastic zone of the residual impression was analysed using sequential polishing, electron channelling contrast imaging (ECCI) and electron backscatter diffraction (EBSD) analysis on and below the surface. For some indentations, the interaction of the dislocations within the plastic zone and the GB leads to a localized GB movement on or below the surface. The occurrence and magnitude of GB movement are found to be strongly influenced by misorientation between the adjacent grains, the orientation of the indenter, as well as the applied load and the distance to the GB. The results show that the localized GB movement under an inhomogeneous stress field at room temperature is a possible deformation mechanism for tungsten.

Freie Schlagworte: Tungsten, Grain boundary movement, Dislocations, Nanoindentation, EBSD, ECCI
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: 06 Jun 2018 05:29
Letzte Änderung: 07 Mär 2019 11:05
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