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Isothermal fatigue damage mechanisms at ambient and elevated temperature of a cast Al-Si-Cu aluminium alloy

Article dans une revue sans comité de lecture
Author
WILSON, Pablo
164351 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
SAINTIER, Nicolas
164351 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
PALIN-LUC, Thierry
164351 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
BERGAMO, Sebastien
300520 RENAULT

URI
http://hdl.handle.net/10985/14436
DOI
10.1016/j.ijfatigue.2018.11.016
Date
2019
Journal
International Journal of Fatigue

Abstract

Cast aluminium alloys have a key position as structural materials for the automotive industry combining good mechanical performance, excellent castability and thermal conductivity, making them a suitable choice for engine parts such as cylinder heads. In this paper, the low-cycle fatigue behaviour of a cast aluminium alloys is investigated at ambient and elevated temperatures by the use of in situ optical surface crack monitoring, secondary electron microscopy and X-ray tomography which are combined to study the fatigue mechanisms. The observations highlight the effect of defect distribution and temperature on the crack propagation path and in particular the change of the role of eutectic regions as the temperature increases. In addition, based on the defects population analyses by tomography, a fatigue crack initiation model is proposed to consider both temperature and defect effects on the total low-cycle fatigue life and fatigue crack growth rates.

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