Abstract
The effects of Si particle size, strength of the matrix and addition of Mn and Fe on the fatigue crack propagation were investigated for high-purity Al-Si casting alloys. The fine distribution of Si particles resulted in the retardation of the crack propagation rate (in the da/dN-ΔK curves) in an Al-12%Si alloy. In Al-7%Si and Al-Si-Mg alloys the retardation of crack propagation rate was pronounced in a high stress intensity range when the strength of the matrix was high. At the threshold region, however, the crack propagation rate was retarded in the decreased matrix strength due to the crack closure effect. The fatigue crack propagation rate (da/dN) in a high stress intensity range was retarded by the addition of Mn and Fe in an Al-Si-Mg alloy.
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