About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
The effect of R-ratio of the High Cycle Fatigue Behaviour of Precipitate-strengthened Al Alloys |
Author(s) |
Yixin Wang, Christopher R. Hutchinson |
On-Site Speaker (Planned) |
Christopher R. Hutchinson |
Abstract Scope |
The fatigue performance of precipitate strengthened Al alloys is important for their use in moving structures applications such as transportation. Recent research has shown that the enhanced high cycle fatigue (HCF) life of underaged (UA) precipitate-strengthened Al alloys compared with peak-aged (PA) alloys under R=-1 loading conditions is due to dynamic precipitation in the PFZ’s in UA materials during cycling, which affects the distribution of plasticity and the time to initiate cracks. Such enhancements in the fatigue life for UA states are not always observed for other R ratios.
In this work, the relationship between the HCF performance, precipitate state, plasticity localization and the loading conditions (i.e. R ratio) of precipitate hardened aluminium alloys is studied. We describe observations of the distribution of plasticity in precipitate containing Al alloys as a function of precipitate state and R-ratio and propose a hypothesis for the underlying mechanisms. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Mechanical Properties, |