Abstract
In the present study, scatter behavior of fatigue limit for the die-cast magnesium alloy AM60B was investigated. Twelve fatigue limits were determined based on S-N curves obtained according to the standard fatigue test methods. The scatter of fatigue limit for the die-cast AM60B was large compared to the extruded AZ61: the values of Weibull modulus and COV were 16 and 6.8, respectively, for the die-cast material, whereas those for the extruded one were 159 and 0.7. The COV value of 0.7 for the extruded AZ61 meant that only 0.7% of scatter from the mean value was included in the fatigue limit determined based on the S- N curve. This COV value was comparable to that of 0.6 for the tensile strength of the same material. Therefore, the fatigue limit for the extruded material has small enough scatter to be considered as the material property similar to the tensile strength that can be determined from the average value of 2-3 samples.
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