About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Defects and Interfaces: Modeling and Experiments
|
Presentation Title |
Slip-grain Boundary Interactions in Magnesium Alloys for Improved Strength and Ductility |
Author(s) |
Vaidehi Menon, Liang Qi |
On-Site Speaker (Planned) |
Vaidehi Menon |
Abstract Scope |
Slip-grain boundary (GB) interactions can provide crucial information on how to improve the strength and ductility of materials. This talk presents a semi-quantitative study using molecular dynamics of these interactions in HCP Mg alloys, which are attractive for light-weight structural applications. We first study the energetics of basal-<a> dislocation transmission for symmetric tilt Mg GBs with changing GB geometry and chemistry, which can shed light on Hall-Petch strengthening phenomena. This investigation involves nucleation of single basal-<a> dislocations from Frank-Read sources in Mg bicrystals with [0001] tilt axis and different tilt angles. Secondly, we explore a novel mechanism for nucleation of pyramidal <c+a> slip at Mg GBs, facilitated by residual dislocations generated by basal-<a> slip interactions with [0001]-tilt STGBs. Detailed analysis of this mechanism is conducted with changing GB structure, solute segregation, and strain rate, to gain insights on GB-induced activation of pyramidal slip in Mg alloys for ductility considerations. |
Proceedings Inclusion? |
Planned: |
Keywords |
Magnesium, Modeling and Simulation, Mechanical Properties |