Aluminum Alloys Sparingly Alloyed with Scandium
The development paths of Al-Mg-Sc alloys sparingly alloyed with scandium are described in the article. The main principle of the development of Al-Mg-Sc alloys sparingly alloyed with scandium is to introduce scandium together with zirconium in equal amounts (0.11-0.15 %). An increase in the zirconium content above this amount leads to the formation of undesirable primary intermetallic compounds (Al<sub>3</sub>Zr). To provide the further reduction of the scandium content, it is recommended to add hundredths of a percent of transition and rare-earth metals, which have a noticeable solubility in the Al<sub>3</sub>Sc phase and replace a part of the scandium. It is necessary to carry out appropriate experiments to select such metals and their amount. The actual properties of the Al-Mg-Mn-Sc-Zr alloy 01570-1 sparingly alloyed with equal contents of scandium and zirconium are given.