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Shrinkage morphology of Al–Si casting alloys

Abstract To make sound aluminium castings, it is important to clarify the shrinkage morphology of the alloys used. The shrinkage morphology of Al–Si alloys containing up to 10%Si has been determined by examining their shrinkage behaviour. The effects of silicon and gas content were investigated using a novel method for quantitative evaluation of the shrinkage morphology of hypoeutectic alloys. It is clarified that the total amount of three types of shrinkage, i.e. porosity, interior and exterior shrinkage, is constant in alloys of the same chemical composition, although each type of shrinkage is affected by the gas content in the melt. It is also confirmed that the relationship between the three kinds of shrinkage changes with silicon content. Furthermore, the change in the ratio of shrinkage with changing gas content is found to be dependent on pore formation.