About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
|
| Presentation Title |
Microstructural Evolution and Mechanical Behavior of AZ Magnesium Alloys at Cryogenic Temperatures |
| Author(s) |
Hafiz Muhammad Rehan Tariq, Umer Masood Chaudry, Tea-Sung Jun |
| On-Site Speaker (Planned) |
Hafiz Muhammad Rehan Tariq |
| Abstract Scope |
The deformation behaviour of AZ-series magnesium alloys at cryogenic temperatures is critical for developing lightweight structural materials for extreme environments. This study comprehensively examines the mechanical response, microstructural evolution, and deformation mechanisms of AZ61, AZ61-1CaO, AZX211, and AZX311 alloys processed through various alloying and thermomechanical strategies. During cryogenic deformation, {10-12} tension twinning was significantly promoted, activating multiple twin variants within individual grains, leading to twin-twin interactions and twin boundary hardening. Concurrently, dislocation accumulation at twin boundaries and around nano-stacking faults enhances dislocation strengthening. Alloying with CaO and Al further alters slip behaviour by activating prismatic <a> and pyramidal <c+a> slip systems, improving ductility at low temperatures. Additionally, thermo-mechanical processing such as cryogenic pre-stretching-annealing caused texture reorientation and enabled the activation of more slip systems, resulting in a synergetic enhancement of strength and ductility during room temperature deformation. These mechanisms collectively enable optimised cryogenic performance in AZ Mg alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Characterization, Mechanical Properties |