Abstract
The charpy impact energy of Al-Si-Cu alloys has been measured. Instrumented charpy impact tests have been conducted at 25 o C, 100 o C and 150 o C. The charpy specimens were machined from plate castings or tapered cylindrical castings. The plates were produced in CO 2 sand molds and tapered cylinders were produced in water cooled Cu molds. Both unmodified and Sr modified castings were tested. The effects of solution treatment on microstructural parameters were studied by optical microscopy. The results indicate Sr modification refines Si, Fe and Cu rich phases in the interdendritic regions. The charpy impact energy increases upon Sr modification
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