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Microstructural Effects on the Fatigue Properties of a Cast Al7SiMg Alloy
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Abstract
The fatigue strength of permanent mould and sandcast aluminium is strongly influenced by the cooling rate during casting. Slower solidification yields larger secondary dendrite arm spacing with a coarser eutectic and greater defetcs i.e. porosities and intermetallic β (FeSiAl5).
The negativ effect of porosity is greater than that of the amount/size of the β-platelets. The defects affect both the crack nucleation and the propagation phases. For very large defects, the initiation phase is reduced and a large portion of the life is spent as crack propagation.
The secondary dendrite arm spacing (DAS) represents a good over all indication of the fatigue strength of the material, which is proportional to (DAS)−1/2. This relationship can be used to estimate the fatigue strength at various locations in a cast aluminium component.
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Wickberg, A., Gustafsson, G., and Larsson, L., "Microstructural Effects on the Fatigue Properties of a Cast Al7SiMg Alloy," SAE Technical Paper 840121, 1984, https://doi.org/10.4271/840121.Also In
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