Abstract
The effects of inhomogeneity phase (IP) such as Si and Al-Fe-Mn in Al-Si eutectic alloys on fatigue strength are considered to be virtually equivalent to small defects or nonmetallic inclusions. The maximum size distribution of the cumulative frequency of IPs was investigated. The square root of the projection area of the maximum IPs (√(area)max) was found to obey the statistics of extreme. The fatigue strength prediction equation was successfully applied to predict the scatter band of the fatigue strength of three kinds of Al-Si new eutectic alloys. These alloys are usually used in the piston component of the high-performance compressor used for car air conditioners. It is suggested also that the combination of the fatigue strength prediction equation with the statistics distribution data on √(area)max can be used for the quality control of materials before the adoption for design.
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