Scatter analysis of fatigue life and pore size data of die-cast AM60B magnesium alloy

Scatter behavior of fatigue life in a die-cast AM60B magnesium alloy was investigated. For comparison, those in a rolled AM60B alloy and a die-cast A365-T5 aluminum alloy were also studied. Scatter behavior of pore size was also investigated to discuss about dominant factors for fatigue life scatter in the die-cast materials. Three-parameter Weibull function was suitable to explain the scatter behavior of both fatigue life and pore size. The scatter of fatigue life in the die-cast AM60B alloy was almost comparable to that in the die-cast A365-T5 alloy, while it was significantly large compared to that in the rolled AM60B alloy. Scatter behavior of pore size observed on the specimen cross-section was comparable to that of fatigue life. Therefore, the scatter behavior of fatigue life can be estimated, if the scatter behavior of pore size on the cross section of specimen would be evaluated, as proposed in the present study.