| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
|
| Presentation Title |
Slip Transfer and Cracking at Grain Boundaries in FCC and HCP Metals |
| Author(s) |
Eugenia Nieto-Valeiras, Maral Sarebanzadeh, Meijuan Zhang, Alberto Orozco-Caballero, Javier Llorca |
| On-Site Speaker (Planned) |
Eugenia Nieto-Valeiras |
| Abstract Scope |
Grain boundaries (GBs) are considered as obstacles to dislocation motion which lead to marked increased in strength in polycrystals. Nevertheless, there is ample experimental evidence that slip transfer across GBs is possible depending on the geometrical criteria, leading to different types of GBs.
Tensile tests were carried out in thin foils of polycrystalline fcc (Al, Ni) and hcp (Mg, Ti)
metals. The orientation of the grains in the surface was determined by means of electron back-scattered diffraction and dislocation activity in each grain on the foil surface was assessed by means of slip trace analysis. The geometrical criteria that lead to either opaque or transparent GBs were assessed for each material from this information. In addition, stress concentrations at the opaque GBs were analyzed as potential sources of GB cracking. The results of the mechanical tests were complemented with crystal plasticity simulations that included GB cracking using cohesive surfaces. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Modeling and Simulation, |