Mechanical and electrical properties of ALTEK alloy electrical foil for transformer windings

The formation of physical and mechanical properties of the aluminum alloy ALTEK (aluminum, heat-resistant, economical, abbreviated: ALTEK), belonging to the Al-Cu-Mn system with a copper concentration of 2% and manganese of 2% during annealing was studied. For this purpose, a 0.2 mm thick foil was obtained from the studied alloy using hot and then cold rolling, which was then annealed at a temperature of 300...500°C. After that, the electrical conductivity and mechanical properties of the foil were studied. The studies showed that the 2Cu2Mn alloy retains high mechanical characteristics when exposed to temperatures of 300...400°C due to heat-resistant particles of Al20Cu2Mn3 released during hot rolling. Electrical conductivity during annealing also increases significantly. The best results are achieved with the annealing mode of 400°C, 3 h: 288.7 MPa with a maximum electrical conductivity value of 29.6 MSm/m.