| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2025
|
| Presentation Title |
Understanding the Role of Crystallographic Grain Orientation and Interfaces on Cyclic Stress Strain Behavior and Crack Initiation in Weakly Textured Magnesium Alloys |
| Author(s) |
Arianna Mena, Justin Smith, Aeriel Murphy-Leonard |
| On-Site Speaker (Planned) |
Arianna Mena |
| Abstract Scope |
The cyclic stress strain (CSS) behavior and mechanisms of crack initiation were explored in two extruded Mg alloys: Mg-2Nd-1Y-0.1Zr-0.1Ca (rare-earth, RE) and Mg-2Zn-0.5Ca (ZX21) (wt. %). Flat, rectangular, dog bone specimens were extracted from the extruded bars and tested under fully-reversed, strain-controlled, low-cycle fatigue conditions at total strain amplitudes between 0.2-1.2%. A methodology employing a combination of scanning electron microscopy (SEM), in-SEM, and ex-situ loading was used to characterize the evolution of deformation and damage throughout the microstructure. The initial crystallographic texture was measured using electron back scatter diffraction (EBSD) and it was determined that the Mg-RE displayed a random texture. Contrarily, ZX21 showed a very weak basal-type texture. In the Mg-RE alloy, the CSS behavior exhibited stable, symmetric hysteresis loops where the maximum tensile and compressive stresses were similar throughout the fatigue lifetime. In ZX21, the presence of deformation twins led to a loop shape that evolved with cycling. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Mechanical Properties, Characterization |