![]() The distributions of defects based on location within the specimens are also analyzed. The variability of defects between the specimens of two sizes as well as different porosity levels are studied statistically. ![]() The defects were evaluated using metallography as well as micro-computed tomography techniques. ![]() This work characterizes defects in high pressure die cast aluminum alloy as an illustrative material, but the methods used can be applicable to other types of castings and defects. However, elimination of these pores is neither always economically nor technically possible. For example, fractography studies of the fatigue specimens have shown that fatigue failure in aluminum castings containing defects is almost always initiated from defects, among which pores are most detrimental. Mechanical performance of cast aluminum alloys is strongly affected by the defects formed during solidification.
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