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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
Presentation Title Grain Boundary Pop-in during Nanoindentation of W: Recent Observation on Dislocation Grain Boundary Interaction
Author(s) Karsten Durst
On-Site Speaker (Planned) Karsten Durst
Abstract Scope Nanoindentations were performed in the vicinity of grain boundaries (GBs) in polycrystalline tungsten, observing in some cases a secondary grain boundary 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. A significant hardness increase was observed before the GB pop-in event. The careful ECCI analysis on polished cross sections shows the dislocation pile-up in the vicinity of the GB along with transmitted dislocations in the adjacent grain. 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 and distance of the indenter to the GB.
Proceedings Inclusion? Planned:
Keywords Mechanical Properties, Other, Other


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Characterization of the Structure and Chemistry of Grain Boundaries and Heterointerfaces in Multiphase High Entropy Oxides Processed by Heat Treatment
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G-29: Numerical Determination of the GND Footprint of Dislocation Loops: Connecting Atomistic Descriptions with Experimental Observations
G-30: The Dimensionality of Absorbed Defects Dictates GB Response to Irradiation
G-31: The Effect of Grain Boundaries on High-temperature Microstructure Evolution in Cu/Nb Composites
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Grain Boundary Mobilities in Polycrystalline Materials
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Using Grain Boundary Segregation Spectra to Design for Nanocrystalline Stability

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