|About this Abstract
||MS&T23: Materials Science & Technology
||Interface-mediated Phenomena in Structural Materials
||Investigation of Dislocation-grain Boundary Interactions Through In-situ Direct Tensile Testing with High-resolution Electron Backscatter Diffraction
||Dongyue Xie, Tongjun Niu, Muh-chang Chen, Jonathan Gigax, Mohammed Zikry, Abigail Hunter, Saryu Fensin, Nan Li
|On-Site Speaker (Planned)
In polycrystalline materials, dislocation motion is a main mechanism of deformation. And it may be impeded by Grain boundaries (GBs), which dramatically change the mechanical properties of materials. To predict the deformation behaviors and properties of material, the interactions between dislocations and GBs were studied. When dislocation encounter grain boundary, depending on the orientation, grain boundary structure, and loading condition, different phenomenons may happen. Dislocations may transmit across GB. Or the GB may absorb the dislocation. Dislocations may also merge into the GB and generate new dislocation on another side of the GB. In our study, we incorporate high resolution Electron backscatter diffraction (EBSD) into in-situ micro pillar direct tensile test. This technology enables us to monitor the distribution of the orientation, strain, and geometrically necessary dislocations (GNDs) during the deformation process. These information helped us to explore how the grain boundary features affect the dislocation reactions and deformation behavior.