About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Fatigue Crack Nucleation Mechanisms in AZ31 Mg Alloy: Experiments and Simulations |
Author(s) |
Abbas Jamali, Anxin Ma, Javier Llorca |
On-Site Speaker (Planned) |
Javier Llorca |
Abstract Scope |
The deformation and fatigue crack nucleation mechanisms were studied by means of slip trace analysis and secondary electron microscopy in a textured AZ31B-O Mg alloy subjected to fully-reversed cyclic deformation along different orientations. In addition, the cyclic stress-strain curves of the samples were simulated by means of crystal plasticity simulations of representative volume elements of the microstructure, including the different slip systems (basal, prismatic and pyramidal) as well as tensile twinning/detwinning. If the dominant deformation mechanisms were basal slip and tensile twinning/detwinning, fatigue cracks nucleated along twins in large grains. If the main deformation mechanisms were tensile twinning/detwinning and pyramidal slip, the longest fatigue cracks were nucleated along pyramidal slip bands in large grains. These experimental results, together with the predictions based on fatigue indicator parameters provided by the simulations, were used to ascertain the effect of texture and strain amplitude on the fatigue life of AZ31 Mg alloy. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Magnesium, Mechanical Properties |