| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2025
|
| Presentation Title |
Microstructure-oriented fatigue crack propagation in two cast Mg-Al-Ba-Ca alloys |
| Author(s) |
Petra Maier, Benjamin Wolfram, Jens Roggelin, Norbert Hort |
| On-Site Speaker (Planned) |
Petra Maier |
| Abstract Scope |
Two cast Mg-Al-Ba-Ca alloys, DieMag633 and DieMag844, are the focus of this study. Their microstructure consists of a eutectic Ca-rich phase, lamellar Al2Ca, and of a brittle compact interdendritic Ba-rich phase, Mg21Al3Ba2. Both phases have a higher hardness than the Mg-matrix and strongly influence the crack propagation under quasi-static and fatigue loading. Mostly interdendritic crack propagation has been found – the crack bridges from the brittle phase to brittle phase. Transgranular cracking within the compact Ba-rich phase is very pronounced, showing many microcracks within this phase. The phases strain-harden in a different amount – the highest hardness increase was found in the Mg-matrix. Very rarely are transdendritic cracks found, and when they are seen only under dynamic loading, it is assumed that the Mg-matrix has hardened so much that the cracks are propagating into the initially soft matrix. The influence of the chemical composition of the alloying elements is discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Mechanical Properties, Characterization |