| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Light Metal Technology
|
| Presentation Title |
Precipitate-strengthened Micromechanical Behaviors of Magnesium Alloy Under Cyclic Loading |
| Author(s) |
Chuhao Liu, Di Xie, Yanfei Gao, Peter K Liaw, Huamiao Wang |
| On-Site Speaker (Planned) |
Huamiao Wang |
| Abstract Scope |
The microscopic-deformation mechanisms of an extruded Magnesium alloy with and without precipitates [Guinier-Preston (GP) zones] subjected to cyclic deformation were investigated by in-situ neutron diffraction (ND) measurement and elastic visco-plastic self-consistent (EVPSC) modeling. The relationship between the macroscopic-cyclic-deformation behavior and the microscopic response (particularly twinning and detwinning) at the grain level was established. The solution-state and peak-aged-state samples plastically deformed by extension twinning during compression, and by a sequential process of detwinning and dislocation motion under reverse tension. The precipitates in PA sample constrain the twinning/detwinning behaviors, which leads to an increase in the participation of dislocation slip in the plastic deformation and then induces a strengthening effect during cyclic loading. Our work provides the first complete analysis of the interaction between precipitation strengthening and twinning/detwinning mechanism under the whole multi-cycle cyclic loading and their effect on the macro and micro mechanical properties of the aging strengthened Magnesium alloys. |