| Abstract: | Fracture Toughness of Pressure Die Cast Magnesium Alloys The increasing use of pressure die cast alloys for the manufacturing of automotive components requires materials values, which describe the mechanical behaviour comprehensively. There is especially a lack of data for the design of safety relevant components. In this paper fracture mechanics investigations are presented to assess the crack resistance of the alloys AZ91, AM50 and AE42 on the basis of the multispecimen test method. The investigations occurred on SENB and CT‐specimens taken from pressure die cast plates of the same dimensions. The results reveal a clear correlation between the microstructure, especially the concentration and the distribution of intermetallic phases, and the crack resistance. Because of the cast‐induced defects like microshrinkage and gas inclusions the good intrinsic properties of the alloys can not be completely exploited. |
