About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
|
Presentation Title |
A Numerical Study on Surface Effect in Hexagonal Slip Activity |
Author(s) |
Cathy Bing, Thomas Bieler, Philip Eisenlohr |
On-Site Speaker (Planned) |
Cathy Bing |
Abstract Scope |
Slip in hexagonal metals depends on the activity of multiple slip families, such as basal <a>, prismatic <a>, or pyramidal <c+a>, that typically require different magnitudes of resolved shear stress to trigger their activation. Frequently, surface observations of slip, i.e. linear traces corresponding to surface steps, are utilized to investigate and quantify these differences in critical resolved shear stress (CRSS). Since the resulting values are not necessarily in agreement with measurements based on bulk techniques, the question arises whether the surface systematically biases the slip activity. We compare simulations of plastically strained polycrystalline structures with and without introducing a surface under a variety of CRSS ratios. A significant difference in relative slip family activity between surface and interior grains is observed. Slip families with the lowest CRSS tend to get amplified near the surface while families with higher CRSS are suppressed. Possible mechanisms and reasons of the results are discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Computational Materials Science & Engineering, Mechanical Properties |