Development of Heat-Resistant Aluminum Alloys for Electrical Engineering Purposes Based on the Al – Fe – Si System

Resumo

The effect of small additions of Mn, Ni, and Cr on a set of mechanical properties at room and elevated temperatures and electrical conductivity of alloys based on the Al – Fe – Si system is studied. It is shown that nickel increases electrical conductivity by 3% for alloys based on the Al – Fe – Si system, and chromium and manganese reduce it by 5 – 10%, which is connected with formation of a more alloyed solid solution. It is established that as a result of cold deformation treatment a dispersed structure forms within the alloy with an average excess phase size up to 0.7 μm. Excess phases of this size are effective recrystallization barriers, and therefore a cold-worked structure is retained in all alloys up to 300°C, which points to good thermal stability of the experimental alloys.