The Influence of Heat Treatment Parameters on the Electrical Conductivity of AlSi7Mg and AlSi10Mg Aluminum Cast Alloys

Abstract

Aluminum alloy casts are widely used in industry as part of heat exchangers. In this case, one of the main requirements is the thermal conductivity and mechanical properties of the alloy. According to the Wiedemann–Franz law, the thermal conductivity of the alloy is expressed by means of measurements of the electrical conductivity value. The article presents the results of research of the impact of type and conditions of heat treatment on electrical properties of aluminum casting alloys type 361.0 and 364.0. Aim of the work is to determine the possibilities of obtaining the electrical properties of alloy while maintaining the required level of mechanical properties. Tests include testing the Brinell hardness and electrical conductivity by eddy current method on samples after solution heat treatment and artificial ageing. On the basis of studies ranges of heat treatment were determined which allow to obtain 27.0 MS/m in case of 357.0 alloy and 23.5 MS/m in case of 361.0 alloy.