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- Title
3D Investigation of Damage During Strain‐Controlled Thermomechanical Fatigue of Cast Al–Si Alloys.
- Authors
Bugelnig, Katrin; Germann, Holger; Steffens, Thomas; Koos, Robert; Boller, Elodie; Wilde, Fabian; Requena, Guillermo
- Abstract
The strain‐controlled thermomechanical fatigue behavior is investigated for three cast near‐eutectic Al–Si alloys with different Ni, Cu, and Mg contents. Synchrotron tomography and neutron diffraction experiments are used to correlate 3D microstructural features with damage initiation and evolution. The results show that the alloy with lower Cu, Ni, and Mg concentrations has up to 45% higher thermomechanical fatigue resistance for cooling/heating rates of 5 and 15 K s−1. In addition, this alloy also exhibits damage formation at later stages during thermomechanical fatigue and slower damage accumulation compared to other alloys. This difference in behavior is a consequence of its higher ductility, which is a result of the lower volume fraction and global interconnectivity of the 3D hybrid networks formed by Si and intermetallics and the absence of large primary Si clusters which act as preferred crack initiation sites during the early stages of thermomechanical fatigue.
- Subjects
ALLOY fatigue; FATIGUE limit; FATIGUE cracks; EUTECTIC alloys; ALLOYS; COPPER; MAGNESIUM alloys
- Publication
Advanced Engineering Materials, 2023, Vol 25, Issue 17, p1
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.202300339