| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2023
|
| Presentation Title |
E-14: Critical Resolved Shear Stresses for Slip and Twinning in Mg-Y-Ca Alloys and Their Effect on Ductility |
| Author(s) |
Mingdi Yu, Jingya Wang, Xiaoqin Zeng, Javier Llorca |
| On-Site Speaker (Planned) |
Javier Llorca |
| Abstract Scope |
The deformation mechanisms in single crystals of a Mg-5Y-0.08Ca (wt. %) alloy along different orientations -selected to activate only one deformation mode- were studied by means of micropillar compression tests as well as slip trace analysis, transmission electron microscopy and transmission Kikuchi diffraction. It was found that the presence of Y and Ca led to a huge increase in the CRSS for <a> basal slip (29±5 MPa), <c+a> pyramidal slip (203±7 MPa) and tensile twin nucleation (above 148 MPa), while the CRSS for <a> prismatic slip only increases up to 105±4 MPa. The changes in the CRSS for slip and tensile twinning modify the dominant deformation mechanisms in polycrystals, leading to large improvements in ductility. In particular, tensile twinning is replaced by <a> prismatic slip during compressive deformation along the a axis and <a> prismatic slip is preferred to <c+a> pyramidal slip in grains suitable oriented for both. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Mechanical Properties, |