Abstract
The effects of inhomogeneity phase (IP) such as Si and Al-Fe-Mn in Al-Si eutectic alloys on fatigue strength are quantitatively evaluated. IPs are necessary for wear resistance but behave like small defects or nonmetallic inclusions in fatigue process. The fatigue strength prediction equation proposed by Murakami et al is successfully applied to predict the scatter band of fatigue strength of three kinds of Al-Si new eutectic alloys. It is also suggested that the combination of the fatigue strength prediction equation with the statistics distribution data on the square root of the projection area of IPs, √area can be used for the quality control of materials before the adoption for design.
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