High-temperature stable electro-conductive aluminum-base alloy

Abstract

An aluminum-base alloy contains components at the following ratio of the same, in mass %: copper 0.5-2.0; manganese 0.3-1.6; zirconium 0.1-0.5; boron 0.02-0.15; silver 0.01-0.5; scandium 0.02-0.15; iron 0.01-0.3; silicon 0.01-0.35; inevitable admixtures 0-0.1 each one of them with 0-0.03, the remnant being aluminum. At the same time, boron, zirconium and scandium are present as nanoparticles AlB 2 , AlB 12 borides and Al 3 (ZrSc) with an average size of no more than 50 nm to provide electric conductivity of at least 55% IACS, the ultimate strength (σ β ) after exposure to 250° C. for 400 hours being at least 170 MPa. The alloy shows increased thermostability and electric conductivity and is foreseen for items operating under elevated temperatures.

1 . A heat-resistant conducting aluminum-base alloy comprising copper, manganese, zirconium, scandium, iron and silicon, characterized by a structure comprising an aluminum solid solution and secondary manganese, zirconium and scandium aluminides, and additionally comprising silver and boron, with the following component ratio in mass %:
 copper 0.5-2.0   manganese 0.3-1.6   boron 0.02-0.15   silver 0.01-0.5   zirconium 0.1-0.5   scandium 0.02-0.15   iron 0.01-0.30   silicon 0.1-0.35   inevitable admixtures 0-0.1, each one of them with 0-0.03,   the rest being aluminum;   
       wherein boron, zirconium and scandium are present in the structure as nanoparticles with an average size of no more than 50 nm of AlB 2 , AlB 12  borides (including inevitable admixtures) and of Al 3  (Zr, Sc) to provide electric conductivity of at least 55% IACS and the ultimate strength (σ β ) of at least 170 MPa after 400 hours of heating at 250° C. 
     
     
         2 . The alloy of  claim 1 , further comprising one or more of the following in mass %: cobalt 0.1-0.45, nickel 0.1-0.35, cadmium 0.1-0.3, P3M 0.001-0.1, and germanium 0.05-0.3.