ELECTRIC-CONDUCTIVITY OF ALSI7MG CAST ALL OYS

The effect of the magnesium content, the solidification conditions and the lightmicroscopic structure on the specific electrical conductivit y of the Aluminium cast alloy AlSi7Mg were investigated. The specific electrical conductivity decreases with increasing Mg-content. Generall y, the specific electrical conductivity and the mechanical properties evaluated by tensile test are increasing with increasing refinement of the microstructure and decreasing porosity. Therefore, the definition of a ''lowest specific electrical conductivity limit'' as a quality c riterion of AlSi-castings becomes possible.