| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces in Ceramics: Fundamental Structure—Property—Performance Relationships
|
| Presentation Title |
Dislocation and Grain Boundary Interaction in Oxides: Slip Transmission or Cracking? |
| Author(s) |
Kuan Ding, Wolfgang Rheinheimer, Wenzhen Xia, Christian Dietz, Enrico Bruder, Karsten Durst, Atsutomo Nakamura, Xufei Fang |
| On-Site Speaker (Planned) |
Kuan Ding |
| Abstract Scope |
Grain boundaries (GBs) play a key role on the mechanical properties for polycrystalline materials. GBs could act as effective barriers for dislocation glide. For brittle ceramic materials, the interaction between dislocation and GB has a crucial influence on the deformation behavior. Here, we studied room temperature GB-dislocation interaction in SrTiO3 with sandwich-type structure having single crystal in the middle and polycrystals on both sides fabricated. The GB structures were characterized using EBSD. Nanoindentation next to GBs and nanoscratch across GBs were carried out to generate dislocations and evaluate the incipient plasticity. Etch pits study, SEM and AFM characterization were conducted to reveal the dislocation structure. We found both slip transmission across GB and GB cracking occurred. For low angle GB, dislocation could propagate through the GB into the adjacent grain. Our findings provide insights for potential improvement of deformation of polycrystalline oxides at room temperature via grain boundary engineering. |